Global Volcanism Program | United States Volcanoes

United States Volcanoes

Mauna Loa
Ta'u
Pavlof Sister
San Francisco Volcanic Field
Kama'ehuakanaloa
Augustine
Shasta
Black Butte Crater Lava Field
Steller
Redoubt
Redoubt
Pavlof
Kanaga
San Francisco Volcanic Field
Atka Volcanic Complex
Great Sitkin
Mono-Inyo Craters
St. Helens
Little Sitkin
Lassen Volcanic Center

Current

United States has 165 Holocene volcanoes. Note that as a scientific organization we provide these listings for informational purposes only, with no international legal or policy implications. Volcanoes will be included on this list if they are within the boundaries of a country, on a shared boundary or area, in a remote territory, or within a maritime Exclusive Economic Zone. Bolded volcanoes have erupted within the past 20 years. Suggestions and data updates are always welcome ().

Volcano Name	Last Eruption	Volcanic Region	Primary Landform
Adams	950 CE	High Cascades Volcanic Arc	Composite
Agrigan	1917 CE	Mariana Volcanic Arc	Composite
Ahyi	2024 CE	Mariana Volcanic Arc	Composite
Akutan	1992 CE	Aleutian Ridge Volcanic Arc	Composite
Alamagan	870 CE	Mariana Volcanic Arc	Composite
Amak	1796 CE	Aleutian Ridge Volcanic Arc	Composite
Amukta	1997 CE	Aleutian Ridge Volcanic Arc	Composite
Anatahan	2008 CE	Mariana Volcanic Arc	Composite
Aniakchak	1931 CE	Alaska Peninsula Volcanic Arc	Caldera
Asuncion	1906 CE	Mariana Volcanic Arc	Composite
Atka Volcanic Complex	2024 CE	Aleutian Ridge Volcanic Arc	Composite
Augustine	2006 CE	Alaska Peninsula Volcanic Arc	Composite
Bachelor	5800 BCE	High Cascades Volcanic Arc	Composite
Baker	1880 CE	Garibaldi Volcanic Arc	Composite
Behm Canal-Rudyerd Bay	Unknown - Evidence Uncertain	Northern Cordilleran Volcanic Province	Cluster
Belknap	475 CE	High Cascades Volcanic Arc	Shield
Black Butte Crater Lava Field	8400 BCE	Yellowstone-Snake River Hotspot Volcano Group	Shield
Black Peak	1900 BCE	Alaska Peninsula Volcanic Arc	Composite
Black Rock Desert	1290 CE	Basin and Range Volcanic Province	Cluster
Blue Lake Crater	680 CE	High Cascades Volcanic Arc	Minor (Basaltic)
Bobrof	Unknown - Evidence Uncertain	Aleutian Ridge Volcanic Arc	Composite
Bogoslof	2017 CE	Aleutian Ridge Volcanic Arc	Composite
Buldir	Unknown - Evidence Uncertain	Aleutian Ridge Volcanic Arc	Composite
Buzzard Creek	1050 BCE	Alaska Peninsula Volcanic Arc	Minor (Basaltic)
Carlisle	1828 CE	Aleutian Ridge Volcanic Arc	Composite
Carrizozo	3250 BCE	Basin and Range Volcanic Province	Minor
Chagulak	Unknown - Evidence Credible	Aleutian Ridge Volcanic Arc	Composite
Chiginagak	1998 CE	Alaska Peninsula Volcanic Arc	Composite
Churchill	847 CE	Wrangell Volcanic Arc	Composite
Cinnamon Butte	Unknown - Evidence Uncertain	High Cascades Volcanic Arc	Minor (Basaltic)
Clear Lake Volcanic Field	Unknown - Evidence Credible	California Coast Ranges Volcano Group	Cluster
Cleveland	2020 CE	Aleutian Ridge Volcanic Arc	Composite
Crater Lake	2850 BCE	High Cascades Volcanic Arc	Caldera
Craters of the Moon	130 BCE	Yellowstone-Snake River Hotspot Volcano Group	Cluster
Daikoku	Unknown - Unrest / Holocene	Mariana Volcanic Arc	Composite
Dana	1890 BCE	Aleutian Ridge Volcanic Arc	Composite
Davidof	Unknown - Evidence Uncertain	Aleutian Ridge Volcanic Arc	Composite
Davis Lake	2790 BCE	High Cascades Volcanic Arc	Cluster
Denison	Unknown - Evidence Uncertain	Alaska Peninsula Volcanic Arc	Composite
Devils Garden	Unknown - Evidence Uncertain	High Lava Plains Volcanic Province	Cluster
Diamond Craters	5610 BCE	High Lava Plains Volcanic Province	Cluster
Dotsero	2200 BCE	Basin and Range Volcanic Province	Minor (Basaltic)
Douglas	Unknown - Evidence Credible	Alaska Peninsula Volcanic Arc	Composite
Duncan Canal	Unknown - Evidence Credible	Queen Charlotte Volcano Group	Cluster
Dutton	Unknown - Evidence Credible	Aleutian Ridge Volcanic Arc	Composite
East Diamante	Unknown - Unrest / Holocene	Mariana Volcanic Arc	Composite
Edgecumbe	2080 BCE	Queen Charlotte Volcano Group	Cluster
Emmons Lake Volcanic Center	Unknown - Evidence Credible	Aleutian Ridge Volcanic Arc	Caldera
Escanaba Segment	2260 BCE	Northeast Pacific Rifts Volcanic Province	Cluster
Esmeralda Bank	Unknown - Unrest / Holocene	Mariana Volcanic Arc	Composite
Farallon de Pajaros	1953 CE	Mariana Volcanic Arc	Composite
Fisher	1830 CE	Aleutian Ridge Volcanic Arc	Composite
Forecast Seamount	Unknown - Unrest / Holocene	Mariana Volcanic Arc	Composite
Fourpeaked	2006 CE	Alaska Peninsula Volcanic Arc	Composite
Frosty	Unknown - Evidence Credible	Aleutian Ridge Volcanic Arc	Composite
Fukujin	1974 CE	Mariana Volcanic Arc	Composite
Gareloi	1989 CE	Aleutian Ridge Volcanic Arc	Composite
Glacier Peak	1700 CE	Garibaldi Volcanic Arc	Composite
Great Sitkin	2024 CE	Aleutian Ridge Volcanic Arc	Composite
Griggs	1790 BCE	Alaska Peninsula Volcanic Arc	Composite
Guguan	1883 CE	Mariana Volcanic Arc	Composite
Haleakala	1750 CE	Hawaiian-Emperor Hotspot Volcano Group	Shield
Hayes	1200 CE	Alaska Peninsula Volcanic Arc	Composite
Hell's Half Acre	3250 BCE	Yellowstone-Snake River Hotspot Volcano Group	Shield
Herbert	Unknown - Evidence Credible	Aleutian Ridge Volcanic Arc	Composite
Hood	1866 CE	High Cascades Volcanic Arc	Composite
Hualalai	1801 CE	Hawaiian-Emperor Hotspot Volcano Group	Shield
Iliamna	1876 CE	Alaska Peninsula Volcanic Arc	Composite
Imuruk Lake	300 CE	Northern Alaska-Bering Sea Volcanic Province	Cluster
Indian Heaven	6250 BCE	High Cascades Volcanic Arc	Cluster
Ingakslugwat Hills	Unknown - Evidence Credible	Northern Alaska-Bering Sea Volcanic Province	Cluster
Jackson Segment	Unknown - Unrest / Holocene	Northeast Pacific Rifts Volcanic Province	Cluster
Jefferson	950 CE	High Cascades Volcanic Arc	Composite
Jordan Craters	1250 BCE	High Lava Plains Volcanic Province	Cluster
Kagamil	1929 CE	Aleutian Ridge Volcanic Arc	Composite
Kaguyak	3850 BCE	Alaska Peninsula Volcanic Arc	Caldera
Kama'ehuakanaloa	1996 CE	Hawaiian-Emperor Hotspot Volcano Group	Shield
Kanaga	2023 CE	Aleutian Ridge Volcanic Arc	Composite
Kasatochi	2008 CE	Aleutian Ridge Volcanic Arc	Composite
Kasuga 1	1959 CE	Mariana Volcanic Arc	Composite
Kasuga 2	Unknown - Evidence Credible	Mariana Volcanic Arc	Composite
Katmai	1912 CE	Alaska Peninsula Volcanic Arc	Composite
Kialagvik	Unknown - Evidence Credible	Alaska Peninsula Volcanic Arc	Composite
Kilauea	2024 CE	Hawaiian-Emperor Hotspot Volcano Group	Shield
Kiska	1990 CE	Aleutian Ridge Volcanic Arc	Composite
Koniuji	1150 BCE	Aleutian Ridge Volcanic Arc	Composite
Kukak	Unknown - Unrest / Holocene	Alaska Peninsula Volcanic Arc	Composite
Kupreanof	Unknown - Evidence Uncertain	Aleutian Ridge Volcanic Arc	Composite
Lassen Volcanic Center	1917 CE	High Cascades Volcanic Arc	Composite
Little Sitkin	1830 CE	Aleutian Ridge Volcanic Arc	Composite
Mageik	500 BCE	Alaska Peninsula Volcanic Arc	Composite
Makushin	1995 CE	Aleutian Ridge Volcanic Arc	Composite
Malumalu	Unknown - Evidence Credible	Samoan Hotspot Volcano Group	Composite
Mammoth Mountain	1260 CE	Basin and Range Volcanic Province	Minor
Mariana Back-Arc Segment at 15.5°N	2015 CE	Mariana Volcanic Arc	Cluster
Markagunt Plateau	1050 CE	Basin and Range Volcanic Province	Cluster
Martin	1953 CE	Alaska Peninsula Volcanic Arc	Composite
Maug Islands	Unknown - Unrest / Holocene	Mariana Volcanic Arc	Composite
Mauna Kea	2460 BCE	Hawaiian-Emperor Hotspot Volcano Group	Shield
Mauna Loa	2022 CE	Hawaiian-Emperor Hotspot Volcano Group	Shield
Medicine Lake	1060 CE	High Cascades Volcanic Arc	Shield
Moffett	1600 BCE	Aleutian Ridge Volcanic Arc	Composite
Mono Lake Volcanic Field	1790 CE	Basin and Range Volcanic Province	Cluster
Mono-Inyo Craters	1380 CE	Basin and Range Volcanic Province	Cluster
Newberry	690 CE	High Cascades Volcanic Arc	Shield
North Gorda Ridge Segment	1996 CE	Northeast Pacific Rifts Volcanic Province	Cluster
Novarupta	1912 CE	Alaska Peninsula Volcanic Arc	Caldera
NW Eifuku	Unknown - Unrest / Holocene	Mariana Volcanic Arc	Composite
NW Rota-1	2010 CE	Mariana Volcanic Arc	Composite
Ofu-Olosega	1866 CE	Samoan Hotspot Volcano Group	Shield
Okmok	2008 CE	Aleutian Ridge Volcanic Arc	Shield
Pagan	2021 CE	Mariana Volcanic Arc	Composite
Pavlof	2022 CE	Aleutian Ridge Volcanic Arc	Composite
Pavlof Sister	Unknown - Evidence Credible	Aleutian Ridge Volcanic Arc	Composite
Rainier	1450 CE	High Cascades Volcanic Arc	Composite
Recheschnoi	Unknown - Evidence Credible	Aleutian Ridge Volcanic Arc	Composite
Red Hill	9450 BCE	Basin and Range Volcanic Province	Cluster
Redoubt	2009 CE	Alaska Peninsula Volcanic Arc	Composite
Roundtop	7600 BCE	Aleutian Ridge Volcanic Arc	Composite
Ruby	2023 CE	Mariana Volcanic Arc	Composite
Salton Buttes	210 CE	Gulf of California Rift Volcanic Province	Minor (Silicic)
San Francisco Volcanic Field	1075 CE	Basin and Range Volcanic Province	Cluster
Sand Mountain Field	950 BCE	High Cascades Volcanic Arc	Cluster
Sarigan	Unknown - Evidence Credible	Mariana Volcanic Arc	Composite
Seamount X	Unknown - Unrest / Holocene	Mariana Volcanic Arc	Composite
Seguam	1993 CE	Aleutian Ridge Volcanic Arc	Composite
Segula	Unknown - Evidence Credible	Aleutian Ridge Volcanic Arc	Composite
Semisopochnoi	2023 CE	Aleutian Ridge Volcanic Arc	Composite
Shasta	1250 CE	High Cascades Volcanic Arc	Composite
Shishaldin	2023 CE	Aleutian Ridge Volcanic Arc	Composite
Snowy Mountain	1710 CE	Alaska Peninsula Volcanic Arc	Composite
Soda Lakes	Unknown - Evidence Credible	Basin and Range Volcanic Province	Minor (Basaltic)
South Sarigan Seamount	2010 CE	Mariana Volcanic Arc	Composite
Spurr	1992 CE	Alaska Peninsula Volcanic Arc	Composite
St. Helens	2008 CE	High Cascades Volcanic Arc	Composite
St. Michael	Unknown - Evidence Credible	Northern Alaska-Bering Sea Volcanic Province	Cluster
St. Paul Island	1280 BCE	Northern Alaska-Bering Sea Volcanic Province	Shield
Steller	Unknown - Evidence Credible	Alaska Peninsula Volcanic Arc	Composite
Stepovak Bay Group	Unknown - Evidence Credible	Aleutian Ridge Volcanic Arc	Cluster
Supply Reef	Unknown - Evidence Uncertain	Mariana Volcanic Arc	Composite
Takawangha	1550 CE	Aleutian Ridge Volcanic Arc	Composite
Tana	Unknown - Evidence Credible	Aleutian Ridge Volcanic Arc	Composite
Tanaga	1914 CE	Aleutian Ridge Volcanic Arc	Composite
Ta'u	Unknown - Evidence Credible	Samoan Hotspot Volcano Group	Shield
Three Sisters	439 CE	High Cascades Volcanic Arc	Composite
Tlevak Strait-Suemez Island	Unknown - Evidence Credible	Queen Charlotte Volcano Group	Cluster
Trident	1974 CE	Alaska Peninsula Volcanic Arc	Composite
Tutuila	440 CE	Samoan Hotspot Volcano Group	Cluster
Ubehebe Craters	150 BCE	Basin and Range Volcanic Province	Minor
Ugashik-Peulik	1814 CE	Alaska Peninsula Volcanic Arc	Composite
Uinkaret Field	1100 CE	Basin and Range Volcanic Province	Cluster
Ukinrek Maars	1977 CE	Alaska Peninsula Volcanic Arc	Minor (Basaltic)
Uliaga	Unknown - Evidence Credible	Aleutian Ridge Volcanic Arc	Composite
Unnamed	Unknown - Evidence Credible	Alaska Peninsula Volcanic Arc	Minor (Silicic)
Vailulu'u	2003 CE	Samoan Hotspot Volcano Group	Shield
Veniaminof	2021 CE	Aleutian Ridge Volcanic Arc	Composite
Vsevidof	1878 CE	Aleutian Ridge Volcanic Arc	Composite
Wapi Lava Field	300 BCE	Yellowstone-Snake River Hotspot Volcano Group	Shield
West Crater	5750 BCE	High Cascades Volcanic Arc	Cluster
Westdahl	1992 CE	Aleutian Ridge Volcanic Arc	Composite
Wrangell	1912 CE	Wrangell Volcanic Arc	Shield
Yantarni	800 BCE	Alaska Peninsula Volcanic Arc	Composite
Yunaska	1937 CE	Aleutian Ridge Volcanic Arc	Shield
Zealandia Bank	Unknown - Unrest / Holocene	Mariana Volcanic Arc	Composite
Zuni-Bandera	1170 BCE	Basin and Range Volcanic Province	Cluster

Chronological listing of known Holocene eruptions (confirmed or uncertain) from volcanoes in United States. Bolded eruptions indicate continuing activity.

Volcano Name	Start Date	Stop Date	Certainty	VEI	Evidence
Kilauea	2024 Dec 23	2024 Dec 23 (continuing)	Confirmed		Observations: Photo / Video
Kilauea	2024 Sep 15	2024 Sep 20	Confirmed		Observations: Reported
Ahyi	2024 Aug 5	2024 Dec 19 (continuing)	Confirmed		Observations: Reported
Kilauea	2024 Jun 3	2024 Jun 3	Confirmed		Observations: Reported
Atka Volcanic Complex	2024 Mar 27	2024 Mar 27	Confirmed		Observations: Reported
Ahyi	2024 Jan 1	2024 Mar 27	Confirmed		Observations: Satellite (visual)
Kanaga	2023 Dec 18	2023 Dec 18	Confirmed	1	Observations: Seismicity
Ruby	2023 Sep 14	2023 Sep 15	Confirmed	1	Observations: Reported
Shishaldin	2023 Jul 11 ± 1 days	2023 Nov 3	Confirmed	3	Observations: Reported
Mauna Loa	2022 Nov 27	2022 Dec 10	Confirmed	0	Observations: Reported
Ahyi	2022 Nov 18 ± 1 days	2023 Jun 11	Confirmed	1	Observations: Reported
Kilauea	2021 Sep 29	2023 Sep 16	Confirmed	0	Observations: Reported
Pavlof	2021 Aug 5	2022 Dec 7	Confirmed	2	Observations: Reported
Pagan	2021 Jul 29	2021 Sep 6	Confirmed	2	Observations: Reported
Great Sitkin	2021 May 25	2024 Dec 19 (continuing)	Confirmed	2	Observations: Reported
Veniaminof	2021 Feb 28	2021 Apr 5	Confirmed	1	Observations: Reported
Semisopochnoi	2021 Feb 2 ± 2 days	2023 May 5	Confirmed	2	Observations: Reported
Kilauea	2020 Dec 20	2021 May 23	Confirmed	0	Observations: Reported
Cleveland	2020 Jun 1	2020 Jun 1	Confirmed	3	Observations: Reported
Semisopochnoi	2019 Dec 7	2020 Jun 19	Confirmed	1	Observations: Reported
Cleveland	[2019 Nov 7]	[2019 Dec 7 (?)]	Uncertain
Shishaldin	2019 Jul 23	2020 May 4	Confirmed	3	Observations: Reported
Semisopochnoi	2019 Jul 16	2019 Aug 24	Confirmed	1	Observations: Reported
Great Sitkin	2019 Jun 1	2019 Jun 7	Confirmed	1	Observations: Reported
Semisopochnoi	2018 Sep 8	2018 Oct 31	Confirmed	1	Observations: Reported
Veniaminof	2018 Sep 4	2018 Dec 23	Confirmed	1	Observations: Reported
Great Sitkin	2018 Jun 10	2018 Aug 11	Confirmed	1	Observations: Reported
Bogoslof	2016 Dec 20	2017 Aug 30	Confirmed	3	Observations: Reported
Cleveland	2016 Apr 16	2019 Jan 20 ± 4 days	Confirmed	3	Observations: Reported
Pavlof	2016 Mar 27	2016 Jul 30	Confirmed	3	Observations: Reported
Pavlof	2014 Nov 12	2014 Nov 15	Confirmed	3	Observations: Reported
Pavlof	2014 May 31	2014 Jun 6	Confirmed	3	Observations: Reported
Ahyi	2014 Apr 24	2014 May 17	Confirmed	2	Observations: Hydrophonic
Shishaldin	2014 Jan 30	2015 Jul 3	Confirmed	1	Observations: Reported
Veniaminof	2013 Jun 13	2013 Oct 12 ± 1 days	Confirmed	3	Observations: Reported
Pavlof	2013 May 13	2013 Jun 26	Confirmed	3	Observations: Reported
Mariana Back-Arc Segment at 15.5°N	2013 Feb 13 (after)	2015 Dec 1 (in or before)	Confirmed	0	Observations: Reported
Pagan	2012 Jul 10	2012 Jul 10	Confirmed	2	Observations: Reported
Kanaga	2012 Feb 18	2012 Feb 18	Confirmed	2	Observations: Reported
Cleveland	2011 Jul 19 ± 7 days	2015 Aug 18	Confirmed	2	Observations: Reported
Pagan	2011 Apr 23 (?)	2011 Sep 1 (?)	Confirmed	2	Observations: Reported
Cleveland	[2010 Sep 11]	[2010 Sep 12]	Uncertain
Cleveland	2010 May 30	2010 Jun 2 (?)	Confirmed	2	Observations: Reported
South Sarigan Seamount	2010 May 27	2010 May 29	Confirmed	3	Observations: Reported
Pagan	2010 May 3	2010 Aug 11	Confirmed	1	Observations: Reported
Cleveland	2009 Oct 2	2009 Dec 12 (?)	Confirmed	2	Observations: Reported
Cleveland	2009 Jun 25	2009 Jun 25	Confirmed	2	Observations: Reported
Pagan	[2009 Apr 15]	[Unknown]	Uncertain
Redoubt	2009 Mar 15	2009 Jul 1 ± 30 days	Confirmed	3	Observations: Reported
Cleveland	2009 Jan 2	2009 Jan 21	Confirmed	2	Observations: Reported
Kasatochi	2008 Aug 7	2008 Aug 9 (?)	Confirmed	4	Observations: Reported
Okmok	2008 Jul 12	2008 Aug 19	Confirmed	4	Observations: Reported
Veniaminof	2008 Feb 22	2008 Mar 1	Confirmed	1	Observations: Reported
Shishaldin	[2008 Feb 12]	[2008 Feb 12]	Uncertain
Anatahan	2007 Nov 27 ± 3 days	2008 Aug 9 (?)	Confirmed	2	Observations: Reported
Pavlof	2007 Aug 15	2007 Sep 13	Confirmed	2	Observations: Reported
Cleveland	2007 Jun 17 (?)	2008 Aug 12 (?)	Confirmed	2	Observations: Reported
Pagan	2006 Dec 4	2006 Dec 8	Confirmed	1	Observations: Reported
Atka Volcanic Complex	2006 Nov 25 ± 5 days	2007 Mar 3 (in or before)	Confirmed	1	Observations: Reported
Fourpeaked	2006 Sep 17	2006 Sep 17	Confirmed	2	Observations: Reported
Anatahan	2006 Mar 20 (?)	2006 Jun 26 (?)	Confirmed	2	Observations: Reported
Veniaminof	2006 Mar 3	2006 Sep 7	Confirmed	1	Observations: Reported
Cleveland	2006 Feb 6	2006 Oct 28	Confirmed	3	Observations: Reported
Augustine	2005 Dec 9 (?)	2006 Apr 27 (?)	Confirmed	3	Observations: Reported
Veniaminof	2005 Sep 7	2005 Nov 4 (?)	Confirmed	1	Observations: Reported
Cleveland	2005 Mar 13 (?)	2005 Nov 27 ± 1 days	Confirmed	2	Observations: Reported
Atka Volcanic Complex	2005 Feb 23	2005 May 5 ± 4 days	Confirmed	1	Observations: Reported
Veniaminof	2005 Jan 4	2005 Feb 14 ± 3 days	Confirmed	2	Observations: Reported
St. Helens	2004 Oct 1	2008 Jan 27 ± 10 days	Confirmed	2	Observations: Reported
Atka Volcanic Complex	2004 Jul 4 (in or before)	Unknown	Confirmed	1	Observations: Reported
Anatahan	2004 Apr 12 (in or before)	2005 Sep 3 (?)	Confirmed	3	Observations: Reported
Shishaldin	2004 Feb 17	2004 Jul 16 (in or after) ± 15 days	Confirmed	2	Observations: Reported
Veniaminof	2004 Feb 16	2004 Sep 5 ± 4 days	Confirmed	2	Observations: Reported
NW Rota-1	2003 Jul 2 (?) ± 182 days	2010 Mar 16 (in or after) ± 15 days	Confirmed	0	Observations: Reported
Anatahan	2003 May 10	2003 Jul 12 ± 3 days	Confirmed	3	Observations: Reported
Vailulu'u	2003 Apr 16 ± 2 years ± 15 days	Unknown	Confirmed	0	Observations: Reported
Veniaminof	2002 Sep 24	2003 Mar 23	Confirmed	1	Observations: Reported
Wrangell	[2002 Aug 1]	[2002 Aug 2]	Uncertain
Atka Volcanic Complex	2002 Jul 16 (in or before) ± 15 days	Unknown	Confirmed	1	Observations: Reported
Pavlof	[2001 Jun 5 ± 4 days]	[Unknown]	Uncertain
Ahyi	2001 Apr 24	2001 Apr 25	Confirmed	0	Observations: Hydrophonic
Cleveland	2001 Feb 2 (in or before)	2001 Apr 15 (?)	Confirmed	3	Observations: Reported
Shishaldin	[2000 Aug 11]	[Unknown]	Uncertain
Shishaldin	[1999 Sep 25 ± 5 days]	[2000 Feb 4 (?)]	Uncertain
Wrangell	[1999 May 14]	[1999 May 14]	Uncertain
Shishaldin	1999 Mar 13	1999 May 27	Confirmed	3	Observations: Reported
Shishaldin	1998 Nov 4	1998 Nov 4	Confirmed	1	Observations: Reported
Chiginagak	1998 Aug 13	1998 Aug 13 (?)	Confirmed	1	Observations: Reported
Atka Volcanic Complex	1998 May 8 ± 1 days	1998 Jul 8 (?)	Confirmed	3	Observations: Reported
Shishaldin	1997 Jun 2	1997 Jun 2	Confirmed	1	Observations: Reported
Cleveland	1997 May 5	1997 May 5	Confirmed	2	Observations: Reported
Amukta	1997 Mar 3	Unknown	Confirmed	1	Observations: Reported
Okmok	1997 Feb 11	1997 May 19 ± 4 days	Confirmed	3	Observations: Reported
Gareloi	[1996 Sep 27]	[Unknown]	Uncertain
Amukta	1996 Sep 17	1996 Sep 18	Confirmed	1	Observations: Reported
Pavlof	1996 Sep 11	1997 Jan 3 (?)	Confirmed	2	Observations: Reported
Pagan	1996 Jul 2 ± 182 days	Unknown	Confirmed	1	Observations: Reported
Kanaga	[1996 Jun 11]	[Unknown]	Uncertain
North Gorda Ridge Segment	1996 Feb 28 (?)	1996 Mar 15 (?)	Confirmed	0	Observations: Reported
Kama'ehuakanaloa	1996 Feb 25 ± 30 days	1996 Aug 9 (?)	Confirmed	0	Observations: Reported
Shishaldin	1995 Dec 23	1996 May 16 (in or before)	Confirmed	3	Observations: Reported
Veniaminof	1995 Nov 15	1995 Nov 30 (?)	Confirmed	1	Observations: Reported
Ruby	1995 Oct 11 (?)	1995 Oct 25	Confirmed	1	Observations: Reported
Kanaga	1995 Jun 19 (?)	1995 Jun 23 (?)	Confirmed	2	Observations: Reported
Atka Volcanic Complex	[1995 May 1]	[Unknown]	Uncertain
Veniaminof	1995 Apr 17	1995 Apr 17	Confirmed	1	Observations: Reported
Makushin	1995 Jan 30	1995 Jan 30	Confirmed	1	Observations: Reported
Vailulu'u	1995 Jan 9	1995 Jan 29	Confirmed	0	Observations: Hydrophonic
Cleveland	1994 Oct 20	1994 Oct 20	Confirmed	1	Observations: Reported
Cleveland	1994 May 25	1994 May 25	Confirmed	3	Observations: Reported
Ahyi	1994 Apr 23	Unknown	Confirmed	0	Observations: Reported
Kanaga	1994 Jan 5 ± 4 days	1994 Nov 26 ± 4 days	Confirmed	2	Observations: Reported
Shishaldin	1993 Sep 4	1993 Oct 29	Confirmed	2	Observations: Reported
Makushin	1993 Aug 16 ± 15 days	1994 Jan 19 (?)	Confirmed	1	Observations: Reported
Veniaminof	1993 Jul 30	1994 Sep 28 (?)	Confirmed	2	Observations: Reported
Seguam	1993 May 28	1993 Aug 31 (in or after)	Confirmed	2	Observations: Reported
Pagan	1993 Jan 15 ± 5 days	1993 Nov 16 (in or after) ± 15 days	Confirmed	2	Observations: Reported
Seguam	1992 Dec 27	1992 Dec 30	Confirmed	2	Observations: Reported
Akutan	1992 Dec 18	Unknown	Confirmed	1	Observations: Reported
Bogoslof	1992 Jul 6	1992 Jul 24	Confirmed	3	Observations: Reported
Spurr	1992 Jun 27	1992 Sep 17	Confirmed	4	Observations: Reported
Pagan	1992 Apr 13	1992 Apr 13	Confirmed	1	Observations: Reported
Akutan	1992 Mar 8	1992 May 21	Confirmed	2	Observations: Reported
Westdahl	1991 Nov 29	1992 Jan 14	Confirmed	3	Observations: Reported
Akutan	1991 Sep 15	1991 Oct 29 ± 1 days	Confirmed	2	Observations: Reported
St. Helens	1990 Nov 5	1991 Feb 14	Confirmed	3	Observations: Reported
Akutan	1990 Sep 6	1990 Oct 1	Confirmed	2	Observations: Reported
Kiska	1990 Jun 1	1990 Jun 1 (?)	Confirmed	2	Observations: Reported
Pavlof	1990 Mar 5	1990 Mar 5	Confirmed	2	Observations: Reported
Akutan	1990 Jan 26 ± 5 days	1990 Jan 26 ± 5 days	Confirmed	2	Observations: Reported
Redoubt	1989 Dec 14	1990 Jun 20 (?)	Confirmed	3	Observations: Reported
St. Helens	1989 Dec 7	1990 Jan 6	Confirmed	2	Observations: Reported
Cleveland	[1989 Oct 25 ± 3 days]	[Unknown]	Uncertain
Ahyi	1989 Sep 21	1989 Dec 27	Confirmed	0	Observations: Hydrophonic
Gareloi	1989 Aug 17	Unknown	Confirmed	1	Observations: Reported
Akutan	1989 Feb 27	1989 Mar 28 (in or before)	Confirmed	2	Observations: Reported
Pagan	1988 Aug 24	1988 Oct 12	Confirmed	2	Observations: Reported
Akutan	1988 Mar 26	1988 Jul 20	Confirmed	2	Observations: Reported
Pagan	[1988 Feb 16]	[Unknown]	Uncertain
Carlisle	[1987 Nov 16]	[Unknown]	Uncertain
Pagan	1987 Sep 4	1987 Sep 4	Confirmed	1	Observations: Reported
Amukta	1987 Sep 4 (?)	Unknown	Confirmed	1	Observations: Reported
Gareloi	1987 Sep 4	Unknown	Confirmed	1	Observations: Reported
Cleveland	1987 Jun 19	1987 Aug 28	Confirmed	3	Observations: Reported
Esmeralda Bank	[1987 May 26]	[Unknown]	Uncertain
Kiska	[1987 Apr 15]	[Unknown]	Uncertain
Semisopochnoi	1987 Apr 13	Unknown	Confirmed	2	Observations: Reported
Veniaminof	1987 Mar 19	1987 Mar 19	Confirmed	1	Observations: Reported
Great Sitkin	[1987 Mar 18]	[Unknown]	Uncertain
Kupreanof	[1987 Mar 10]	[1987 Mar 10]	Uncertain
Atka Volcanic Complex	1987 Mar 4 (?)	1987 Mar 19 (?)	Confirmed	2	Observations: Reported
Makushin	1987 Mar 2	1987 Mar 2	Confirmed	1	Observations: Reported
Akutan	1987 Jan 31	1987 Jun 24	Confirmed	2	Observations: Reported
Okmok	1986 Nov 18	1988 Feb 26	Confirmed	2	Observations: Reported
Kama'ehuakanaloa	[1986 Sep 20]	[1986 Sep 20]	Uncertain
Atka Volcanic Complex	[1986 May 23]	[Unknown]	Uncertain
Cleveland	1986 Apr 28	1986 May 27 (in or after)	Confirmed	2	Observations: Reported
Pavlof	1986 Apr 16	1988 Aug 13	Confirmed	3	Observations: Reported
Augustine	1986 Mar 27	1986 Aug 31	Confirmed	4	Observations: Reported
Shishaldin	1986 Mar 19	1987 Feb 15 (?)	Confirmed	2	Observations: Reported
Akutan	1986 Mar 18	1986 Jun 30	Confirmed	2	Observations: Reported
Cleveland	[1985 Dec 10]	[Unknown]	Uncertain
Ahyi	1985 Aug 2	1985 Sep 5	Confirmed	0	Observations: Hydrophonic
Veniaminof	1984 Nov 29	1984 Dec 6 (?)	Confirmed	2	Observations: Reported
Kama'ehuakanaloa	[1984 Nov 11]	[1985 Jan 21]	Uncertain
Cleveland	1984 Jul 12	1984 Jul 12	Confirmed	1	Observations: Reported
Mauna Loa	1984 Mar 25	1984 Apr 15	Confirmed	0	Observations: Reported
Pavlof	1983 Nov 11	1983 Dec 18	Confirmed	3	Observations: Reported
Pavlof	1983 Jul 11	1983 Jul 18	Confirmed	2	Observations: Reported
Okmok	1983 Jul 8	1983 Jul 8	Confirmed	2	Observations: Reported
Veniaminof	1983 Jun 2	1984 Apr 17	Confirmed	3	Observations: Reported
Kilauea	1983 Jan 3	2018 Sep 5	Confirmed	3	Observations: Reported
Fukujin	[1982 Dec 15]	[Unknown]	Uncertain
Akutan	1982 Oct 5 ± 4 days	1983 May 16 ± 15 days	Confirmed	2	Observations: Reported
Kilauea	1982 Sep 25	1982 Sep 26	Confirmed	0	Observations: Reported
Pavlof	[1982 Jul 15 ± 45 days]	[Unknown]	Uncertain
Kilauea	1982 Apr 30	1982 May 1	Confirmed	0	Observations: Reported
Esmeralda Bank	[1982 Apr 6]	[Unknown]	Uncertain
Gareloi	1982 Jan 15	1982 Jan 15	Confirmed	3	Observations: Reported
Fukujin	[1982 Jan 12]	[1982 Mar 16]	Uncertain
Pavlof	1981 Sep 25	1981 Sep 27	Confirmed	3	Observations: Reported
Shishaldin	[1981 Sep 25]	[Unknown]	Uncertain
Pagan	1981 May 15	1985 May 1 (in or after)	Confirmed	4	Observations: Reported
Pavlof	1981 Mar 30 (in or before)	1981 May 28	Confirmed	1	Observations: Reported
Okmok	1981 Mar 24	1981 Mar 24	Confirmed	3	Observations: Reported
Fukujin	[1981 Jan 7]	[1981 Jan 8]	Uncertain
Pavlof	1980 Nov 8	1980 Nov 13	Confirmed	3	Observations: Reported
Gareloi	1980 Aug 7	1980 Sep 17	Confirmed	3	Observations: Reported
Pavlof	1980 Jul 6 ± 1 days	Unknown	Confirmed	1	Observations: Reported
Akutan	1980 Jul 3 (in or before)	1980 Jul 8 (?)	Confirmed	2	Observations: Reported
Makushin	1980 May 1 ± 75 days	Unknown	Confirmed	1	Observations: Reported
St. Helens	1980 Mar 27	1986 Oct 28 ± 3 days	Confirmed	5	Observations: Reported
Kilauea	1980 Mar 11	1980 Mar 11	Confirmed	0	Observations: Reported
Kilauea	1979 Nov 16	1979 Nov 17	Confirmed	0	Observations: Reported
Ahyi	[1979 Nov 15]	[1979 Nov 15]	Uncertain
Fukujin	[1979 Apr 26]	[1980 May 12]	Uncertain
Shishaldin	1979 Feb 16 ± 15 days	Unknown	Confirmed	2	Observations: Reported
Westdahl	[1979 Feb 8]	[1979 Feb 9]	Uncertain
Akutan	1978 Sep 25 ± 5 days	1978 Oct 16 ± 15 days	Confirmed	2	Observations: Reported
Fukujin	[1978 Aug 24]	[1978 Aug 25]	Uncertain
Shishaldin	1978 Feb 8	1978 Feb 9 (?)	Confirmed	2	Observations: Reported
Westdahl	1978 Feb 4	1978 Feb 9	Confirmed	3	Observations: Reported
Fukujin	[1977 Oct 14]	[1978 Mar 24]	Uncertain
Kilauea	1977 Sep 13	1977 Oct 1	Confirmed	0	Observations: Reported
Ukinrek Maars	1977 Mar 30	1977 Apr 9	Confirmed	3	Observations: Reported
Seguam	1977 Mar 6	1977 Mar 8 (?)	Confirmed	1	Observations: Reported
Akutan	1976 Oct 15 ± 45 days	1977 May 9 (in or after)	Confirmed	2	Observations: Reported
Fukujin	[1976 Aug 2]	[1977 Apr 21]	Uncertain
Atka Volcanic Complex	[1976 Jul 2 ± 182 days]	[Unknown]	Uncertain
Augustine	1976 Jan 22 (?)	1977 May 14 (?)	Confirmed	4	Observations: Reported
Shishaldin	1976 Jan 16 ± 15 days	1976 Sep 28	Confirmed	2	Observations: Reported
Kilauea	1975 Nov 29	1975 Nov 29	Confirmed	0	Observations: Reported
Kasuga 1	[1975 Nov 16 ± 15 days]	[Unknown]	Uncertain
Cleveland	[1975 Sep 16 ± 15 days]	[Unknown]	Uncertain
Shishaldin	1975 Sep 13	1975 Oct 26 ± 5 days	Confirmed	2	Observations: Reported
Pavlof	1975 Sep 13	1977 Mar 16 (in or after) ± 15 days	Confirmed	2	Observations: Reported
Kama'ehuakanaloa	[1975 Aug 24 (?)]	[1975 Nov 16 ± 15 days]	Uncertain
Mauna Loa	1975 Jul 5	1975 Jul 6	Confirmed	0	Observations: Reported
Esmeralda Bank	[1975 Apr 26]	[1975 Apr 29]	Uncertain
Kilauea	1974 Dec 31	1974 Dec 31	Confirmed	0	Observations: Reported
Pavlof	1974 Sep 1 (in or before)	1975 Jan 13	Confirmed	3	Observations: Reported
Trident	1974 Jul 15 ± 45 days	Unknown	Confirmed	3	Observations: Reported
Pavlof	1974 Mar 12	1974 Mar 24 (?)	Confirmed	1	Observations: Reported
Great Sitkin	1974 Feb 19	1974 Sep 16 ± 15 days	Confirmed	2	Observations: Reported
Akutan	1974 Feb 11 (in or before)	Unknown	Confirmed	2	Observations: Reported
Pavlof	1973 Nov 12	1973 Nov 13	Confirmed	2	Observations: Reported
Fukujin	1973 Sep 27	1974 Mar 5	Confirmed	1	Observations: Reported
Atka Volcanic Complex	1973 Aug 25 ± 2 days	Unknown	Confirmed	0	Observations: Reported
Vailulu'u	1973 Jul 10	1973 Jul 10	Confirmed	0	Observations: Hydrophonic
Akutan	1973 Mar 16 (?) ± 15 days	1973 May 16 ± 15 days	Confirmed	2	Observations: Reported
Akutan	[1972 Sep 16 (?) ± 15 days]	[Unknown]	Uncertain
Augustine	1971 Oct 7	1971 Oct 8	Confirmed	1	Observations: Reported
Kama'ehuakanaloa	[1971 Sep 17]	[1972 Sep 16 ± 15 days]	Uncertain
Chiginagak	1971 Jul 16 ± 15 days	1971 Jul 16 ± 15 days	Confirmed	2	Observations: Reported
Esmeralda Bank	[1970 Jul 2 ± 1 years ± 182 days]	[Unknown]	Uncertain
Kiska	1969 Sep 11	1969 Sep 16	Confirmed	2	Observations: Reported
Wrangell	[1969 Aug 16 ± 15 days]	[Unknown]	Uncertain
Ahyi	1969 Mar 11	1969 Mar 13	Confirmed	0	Observations: Hydrophonic
Kilauea	1969 Feb 22	1974 Sep 19	Confirmed	0	Observations: Reported
Trident	1968 Nov 13	1968 Nov 13	Confirmed	3	Observations: Reported
Fukujin	1968 Sep 16 ± 15 days	Unknown	Confirmed	0	Observations: Reported
Redoubt	1967 Dec 6	1968 Apr 28 (in or after)	Confirmed	3	Observations: Reported
Kilauea	1967 Nov 5	1968 Oct 22	Confirmed	0	Observations: Reported
Trident	1967 Sep 5	1968 Feb 25	Confirmed	3	Observations: Reported
Ahyi	1967 Mar 27	1967 Apr 10	Confirmed	0	Observations: Hydrophonic
Shishaldin	1967 Jan 28	Unknown	Confirmed	2	Observations: Reported
Redoubt	1966 Oct 7	1967 Jan 15	Confirmed	3	Observations: Reported
Trident	1966 Jul 2 (?) ± 182 days	Unknown	Confirmed	0	Observations: Reported
Ruby	1966 Apr 21 ± 7 days	1966 May 16 ± 15 days	Confirmed	1	Observations: Hydrophonic
Pavlof	1966 Mar 15	Unknown	Confirmed	2	Observations: Reported
Redoubt	1966 Jan 24	1966 Feb 20	Confirmed	3	Observations: Reported
Kilauea	1965 Dec 24	1965 Dec 25	Confirmed	0	Observations: Reported
Kilauea	1965 Mar 5	1965 Mar 15	Confirmed	0	Observations: Reported
Trident	1964 May 31	Unknown	Confirmed	3	Observations: Reported
Esmeralda Bank	[1964 Apr 14]	[Unknown]	Uncertain
Kiska	1964 Mar 18	Unknown	Confirmed	0	Observations: Reported
Westdahl	1964 Mar 10	1964 Apr 16	Confirmed	2	Observations: Reported
Shishaldin	1963 Dec 28	Unknown	Confirmed	2	Observations: Reported
Trident	1963 Oct 17	1963 Nov 17 (?)	Confirmed	3	Observations: Reported
Augustine	1963 Oct 11	1964 Aug 19	Confirmed	2	Observations: Reported
Kilauea	1963 Aug 21	1963 Oct 6	Confirmed	0	Observations: Reported
Trident	1963 Apr 1	1963 Apr 3	Confirmed	3	Observations: Reported
Amukta	1963 Feb 13	Unknown	Confirmed	3	Observations: Reported
Kilauea	1962 Dec 7	1962 Dec 9	Confirmed	0	Observations: Reported
Akutan	1962 Nov 5 ± 4 days	Unknown	Confirmed	2	Observations: Reported
Trident	1962 Jun 9	1962 Jun 9	Confirmed	3	Observations: Reported
Kiska	1962 Jan 24	Unknown	Confirmed	3	Observations: Reported
Kilauea	1961 Jul 10	1961 Sep 24	Confirmed	1	Observations: Reported
Trident	1961 Jun 30 (?)	Unknown	Confirmed	2	Observations: Reported
Kilauea	1961 Feb 24	1961 Mar 25	Confirmed	1	Observations: Reported
Okmok	1960 Oct 15 ± 45 days	1961 Apr 15 ± 45 days	Confirmed	3	Observations: Reported
Pavlof	1960 Jul 2 (?) ± 182 days	1963 Jun 16 (?) ± 15 days	Confirmed	2	Observations: Reported
Kilauea	1959 Nov 14	1960 Feb 19	Confirmed	2	Observations: Reported
Fukujin	[1959 Aug 16 ± 15 days]	[1959 Oct 16 ± 15 days]	Uncertain
Kasuga 1	1959 Jul 15 ± 45 days	Unknown	Confirmed	0	Observations: Reported
Fukujin	[1958 Aug 16 ± 15 days]	[1958 Sep 16 ± 15 days]	Uncertain
Okmok	1958 Aug 14	1958 Aug 25 ± 10 days	Confirmed	3	Observations: Reported
Pavlof	1958 May 17	1958 Aug 28	Confirmed	2	Observations: Reported
Trident	1957 Jul 2 ± 182 days	1960 Aug 10 (?)	Confirmed	2	Observations: Reported
Vsevidof	[1957 Mar 11]	[1957 Mar 12]	Uncertain
Trident	1956 Sep 8	1956 Sep 9	Confirmed	2	Unknown
Kaena	[1956 May 22]	[1956 May 23]	Uncertain
Veniaminof	1956 Mar 16 ± 15 days	1956 May 23	Confirmed	3	Observations: Reported
Shishaldin	1955 Jul 16 ± 15 days	Unknown	Confirmed	2	Observations: Reported
Kilauea	1955 Feb 28	1955 May 26	Confirmed	0	Observations: Reported
Kilauea	1954 May 31	1954 Jun 3	Confirmed	0	Observations: Reported
Pavlof	1953 Nov 25	1954 Aug 16 ± 15 days	Confirmed	1	Observations: Reported
Shishaldin	1953 Oct 4 ± 3 days	Unknown	Confirmed	2	Observations: Reported
Spurr	1953 Jul 9	1953 Jul 16	Confirmed	4	Observations: Reported
Akutan	1953 Jul 2 ± 182 days	Unknown	Confirmed	2	Observations: Reported
Atka Volcanic Complex	[1953 Jul 2 ± 182 days]	[1954 Jul 2 ± 182 days]	Uncertain
Cleveland	[1953 Jun 25]	[Unknown]	Uncertain
Iliamna	[1953 Mar 1]	[Unknown]	Uncertain
Martin	1953 Feb 17	Unknown	Confirmed		Unknown
Trident	1953 Feb 15	1954 Oct 5 (?)	Confirmed	3	Observations: Reported
Farallon de Pajaros	1952 Oct 26 ± 5 days	1953 Apr 15	Confirmed	2	Observations: Reported
Fukujin	[1952 Jul 2 ± 182 days]	[Unknown]	Uncertain
Iliamna	[1952 Jul 2 ± 182 days]	[Unknown]	Uncertain
Makushin	[1952 Jul 2 ± 182 days]	[Unknown]	Uncertain
Kilauea	1952 Jun 27	1952 Nov 10	Confirmed	0	Observations: Reported
Gareloi	1952 Jan 17	Unknown	Confirmed	2	Observations: Reported
Makushin	1951 Dec 20	Unknown	Confirmed	1	Observations: Reported
Cleveland	[1951 Nov 1]	[1951 Dec 16 ± 15 days]	Uncertain
Akutan	1951 Oct 16 ± 15 days	Unknown	Confirmed	2	Observations: Reported
Pavlof	1951 Oct 16 ± 15 days	1952 Feb 16 (?) ± 15 days	Confirmed	2	Observations: Reported
Bogoslof	[1951 Sep 21]	[Unknown]	Uncertain
Farallon de Pajaros	1951 Aug 16 ± 15 days	Unknown	Confirmed	2	Observations: Reported
Martin	1951 Jul 22	Unknown	Confirmed		Unknown
Fukujin	1951 Jul 15 ± 45 days	1951 Oct 15 ± 45 days	Confirmed	0	Observations: Reported
Atka Volcanic Complex	[1951 Jul 2 ± 182 days]	[Unknown]	Uncertain
Shishaldin	1951 Apr 16 ± 15 days	1951 Oct 5 ± 4 days	Confirmed	2	Observations: Reported
Great Sitkin	1950 Nov 5	1950 Nov 29	Confirmed		Observations: Reported
Pavlof	1950 Jul 31	1951 May 16 ± 15 days	Confirmed	2	Observations: Reported
Trident	1950 Jul 2	1950 Aug 18	Confirmed	2	Unknown
Gareloi	1950 Jul 2 ± 182 days	1951 Jul 2 ± 182 days	Confirmed	1	Observations: Reported
Mauna Loa	1950 Jun 1	1950 Jun 23	Confirmed	0	Observations: Reported
Great Sitkin	1949 Dec 30	1950 Jan 7	Confirmed	1	Observations: Reported
Trident	1949 Jun	Unknown	Confirmed		Observations: Reported
Mauna Loa	1949 Jan 6	1949 May 31	Confirmed	0	Observations: Reported
Akutan	1948 Apr 29	1948 Aug 7 (in or after)	Confirmed	2	Observations: Reported
Shishaldin	1948	Unknown	Confirmed	2	Observations: Reported
Iliamna	[1947 Jun]	[Unknown]	Uncertain
Farallon de Pajaros	[1947 Jan (?)]	[Unknown]	Uncertain
Akutan	1946 Dec	1947 Jan	Confirmed	2	Observations: Reported
Great Sitkin	[1946 Aug 14]	[Unknown]	Uncertain
Shishaldin	1946 Aug	1947 Jan	Confirmed	2	Observations: Reported
Mageik	[1946]	[Unknown]	Uncertain
Okmok	1945 Jun 4	1945 Dec	Confirmed	2	Observations: Reported
Great Sitkin	1945 Mar	Unknown	Confirmed	2	Observations: Reported
Esmeralda Bank	[1944 Aug 20 ± 10 days]	[Unknown]	Uncertain
Cleveland	1944 Jun 10	1944 Jun 12	Confirmed	3	Observations: Reported
Veniaminof	1944 Mar 28	Unknown	Confirmed	2	Observations: Reported
Okmok	1943 Jun	Unknown	Confirmed	1	Observations: Reported
Farallon de Pajaros	1943	Unknown	Confirmed	2	Observations: Reported
St. Paul Island	[1943]	[Unknown]	Uncertain
Mauna Loa	1942 Apr 26	1942 May 10	Confirmed	0	Observations: Reported
Kanaga	1942	Unknown	Confirmed	1	Observations: Reported
Aniakchak	[1942]	[Unknown]	Uncertain
Farallon de Pajaros	1941 Mar 28	Unknown	Confirmed	1	Observations: Reported
Mauna Loa	1940 Apr 7	1940 Aug 18	Confirmed	0	Observations: Reported
Veniaminof	1939 Nov	Unknown	Confirmed	2	Observations: Reported
Veniaminof	1939 May 23	1939 Jun 26 (?)	Confirmed	3	Observations: Reported
Farallon de Pajaros	1939	Unknown	Confirmed	1	Observations: Reported
Makushin	1938 Oct	Unknown	Confirmed	2	Observations: Reported
Okmok	1938	Unknown	Confirmed		Observations: Reported
Cleveland	1938	Unknown	Confirmed		Observations: Reported
Yunaska	1937 Nov 3	1937 Nov 4	Confirmed	3	Observations: Reported
Mageik	[1936 Jul 4]	[1936 Jul 5]	Uncertain
Farallon de Pajaros	1936 Apr 15 ± 45 days	Unknown	Confirmed	1	Observations: Reported
Pavlof	1936	1948 May (?)	Confirmed	3	Observations: Reported
Okmok	[1936]	[Unknown]	Uncertain
Mauna Loa	1935 Nov 21	1936 Jan 2	Confirmed	0	Observations: Reported
Augustine	1935 Mar 13	1935 Aug 18	Confirmed	3	Observations: Reported
Kilauea	1934 Sep 6	1934 Oct 8	Confirmed	0	Observations: Reported
Ahyi	1934 Jul 15 ± 45 days	Unknown	Confirmed	1	Observations: Reported
Farallon de Pajaros	[1934]	[Unknown]	Uncertain
Mauna Loa	1933 Dec 2	1933 Dec 18	Confirmed	0	Observations: Reported
Great Sitkin	1933 Nov	Unknown	Confirmed	2	Observations: Reported
Redoubt	[1933 May 25]	[Unknown]	Uncertain
Iliamna	[1933 May 5]	[Unknown]	Uncertain
Farallon de Pajaros	1932 Sep 7	1932 Oct 7	Confirmed	2	Observations: Reported
Shishaldin	1932 Feb 1	1932 May 21	Confirmed	2	Observations: Reported
Cleveland	1932 Jan 1	Unknown	Confirmed		Observations: Reported
Kilauea	1931 Dec 23	1932 Jan 5	Confirmed	0	Observations: Reported
Bogoslof	1931 Oct 31	Unknown	Confirmed	1	Observations: Reported
Aniakchak	1931 May 1	1931 Jun 13 (in or after)	Confirmed	4	Observations: Reported
Akutan	1931 May	1931 Aug	Confirmed	2	Observations: Reported
Okmok	1931 Mar 21	1931 May 13 (in or after)	Confirmed	2	Observations: Reported
Kilauea	1930 Nov 19	1930 Dec 7	Confirmed	0	Observations: Reported
Wrangell	[1930 Jun 30]	[Unknown]	Uncertain
Veniaminof	1930 Jun	Unknown	Confirmed	2	Observations: Reported
Chiginagak	[1929 Dec]	[Unknown]	Uncertain
Kagamil	1929 Dec	Unknown	Confirmed		Observations: Reported
Mageik	[1929 Aug 19]	[1929 Dec]	Uncertain
Kilauea	1929 Jul 25	1929 Jul 28	Confirmed	0	Observations: Reported
Shishaldin	1929 May 28	1929 Jun 23 (in or after)	Confirmed	2	Observations: Reported
Akutan	1929 May (?)	Unknown	Confirmed	2	Observations: Reported
Gareloi	1929 Apr	1930	Confirmed	3	Observations: Reported
Cleveland	[1929 Mar]	[Unknown]	Uncertain
Pavlof	1929 Mar	1931 Aug	Confirmed	2	Observations: Reported
Kilauea	1929 Feb 20	1929 Feb 21	Confirmed	0	Observations: Reported
Pagan	[1929]	[1930]	Uncertain
Yunaska	[1929]	[Unknown]	Uncertain
Farallon de Pajaros	1928 Dec 15 ± 5 days	Unknown	Confirmed	2	Observations: Reported
Shishaldin	1928 Aug	Unknown	Confirmed	2	Observations: Reported
Mageik	[1927 Aug 26 ± 5 days]	[Unknown]	Uncertain
Kilauea	1927 Jul 7	1927 Jul 20	Confirmed	0	Observations: Reported
Shishaldin	1927	Unknown	Confirmed		Observations: Reported
Seguam	[1927]	[Unknown]	Uncertain
Akutan	1927	1928	Confirmed	2	Observations: Reported
Gareloi	[1927]	[Unknown]	Uncertain
Kiska	[1927]	[Unknown]	Uncertain
Makushin	1926 Dec 30	Unknown	Confirmed	2	Observations: Reported
Bogoslof	1926 Jul	1928	Confirmed	2	Observations: Reported
Mauna Loa	1926 Apr 10	1926 Apr 28 (?)	Confirmed	0	Observations: Reported
Pagan	1925 Feb	1925 May 5	Confirmed	2	Observations: Reported
Farallon de Pajaros	1925	Unknown	Confirmed	2	Observations: Reported
Shishaldin	1925	Unknown	Confirmed		Observations: Reported
Kilauea	1924 May 10	1924 Jul 29	Confirmed	2	Observations: Reported
Pavlof	1924 Jan 17	Unknown	Confirmed	2	Observations: Reported
Asuncion	[1924]	[Unknown]	Uncertain
Pagan	1923 Feb (?)	1923 Mar 26 ± 5 days	Confirmed	3	Observations: Reported
Pavlof	1922 Dec 24	1923 Feb 28 ± 60 days	Confirmed	2	Observations: Reported
Shishaldin	1922 Oct 15 ± 45 days	Unknown	Confirmed	2	Observations: Reported
Gareloi	1922	Unknown	Confirmed	3	Observations: Reported
Wrangell	[1921 Jul 3]	[1921 Jul 3]	Uncertain
St. Helens	[1921 Mar 18]	[Unknown]	Uncertain
Mauna Loa	1919 Sep 26	1919 Nov 5 (?)	Confirmed	0	Observations: Reported
Pavlof	1917 Oct	Unknown	Confirmed	2	Observations: Reported
Agrigan	1917 Apr 9	Unknown	Confirmed	4	Observations: Reported
Pagan	1917	Unknown	Confirmed	2	Observations: Reported
Mauna Loa	1916 May 19	1916 May 30	Confirmed	0	Observations: Reported
Mauna Loa	1914 Nov 25	1915 Jan 11	Confirmed	0	Observations: Reported
Pavlof	1914 Jul 6	Unknown	Confirmed	2	Observations: Reported
Lassen Volcanic Center	1914 May 30	1917 Jun 29	Confirmed	3	Observations: Reported
Tanaga	1914	Unknown	Confirmed	0	Observations: Reported
Trident	1913 Sep	Unknown	Confirmed	1	Observations: Reported
Bogoslof	[1913 Jul]	[Unknown]	Uncertain
Katmai	1912 Jun 6	1912 Jul 21 (in or after)	Confirmed	3	Observations: Reported
Novarupta	1912 Jun 6	1912 Oct (?)	Confirmed	6	Observations: Reported
Farallon de Pajaros	1912	Unknown	Confirmed	2	Observations: Reported
Shishaldin	[1912]	[Unknown]	Uncertain
Makushin	[1912]	[Unknown]	Uncertain
Akutan	[1912]	[Unknown]	Uncertain
Wrangell	1911 Apr 14	1912 Sep 14 (?)	Confirmed	1	Observations: Reported
Akutan	1911	Unknown	Confirmed	2	Observations: Reported
Medicine Lake	[1910 Jan]	[Unknown]	Uncertain
Bogoslof	1909 Sep	1910 Sep 19	Confirmed	2	Observations: Reported
Pagan	1909	Unknown	Confirmed	2	Observations: Reported
Akutan	1908 Feb 22	Unknown	Confirmed	0	Observations: Reported
Bogoslof	[1908 Jan 15 ± 45 days]	[Unknown]	Uncertain
Augustine	1908	Unknown	Confirmed	1	Observations: Reported
Wrangell	[1907 Apr 1 (in or before)]	[Unknown]	Uncertain
Mauna Loa	1907 Jan 9	1907 Jan 24 (in or after)	Confirmed	0	Observations: Reported
Kiska	[1907]	[Unknown]	Uncertain
Makushin	1907	Unknown	Confirmed		Observations: Reported
Akutan	1907	Unknown	Confirmed		Observations: Reported
Atka Volcanic Complex	1907	Unknown	Confirmed		Observations: Reported
Kilauea	1906 Dec 2	1924 Feb	Confirmed	0	Observations: Reported
Kanaga	1906 May	Unknown	Confirmed		Observations: Reported
Bogoslof	1906 Mar 1 ± 30 days	1907 Sep 1	Confirmed	3	Observations: Reported
Pavlof	1906	1911 Dec 7 (?)	Confirmed	3	Observations: Reported
Asuncion	1906	Unknown	Confirmed	2	Observations: Reported
Kilauea	1905 Feb 22	1906 Apr	Confirmed	0	Observations: Reported
Kanaga	1904	Unknown	Confirmed	0	Observations: Reported
Great Sitkin	[1904]	[Unknown]	Uncertain
Kilauea	1903 Nov 25	1904 Jan 10	Confirmed	0	Observations: Reported
St. Helens	[1903 Sep 15]	[Unknown]	Uncertain
Mauna Loa	1903 Sep 1	1903 Dec 7 (?)	Confirmed	0	Observations: Reported
Wrangell	1902 Jul 15 ± 45 days	Unknown	Confirmed	2	Observations: Reported
Kilauea	1902 Jun 3	1903 Mar 5 ± 5 days	Confirmed	0	Observations: Reported
Kilauea	1902 Feb 14 (in or before)	1902 Feb	Confirmed	0	Observations: Reported
Redoubt	1902 Jan 18	Unknown	Confirmed	3	Observations: Reported
Seguam	1902	Unknown	Confirmed	3	Observations: Reported
Farallon de Pajaros	1901 Jan (?)	1902 Dec	Confirmed	2	Uncertain
Pavlof	1901	Unknown	Confirmed	2	Observations: Reported
Shishaldin	1901	Unknown	Confirmed		Observations: Reported
Wrangell	1900 Jun (in or before)	Unknown	Confirmed	2	Observations: Reported
Wrangell	1899 Sep 3	Unknown	Confirmed	2	Observations: Reported
Mauna Loa	1899 Jul 1	1899 Jul 23	Confirmed	1	Observations: Reported
Shishaldin	[1899]	[Unknown]	Uncertain
Kasatochi	[1899 (?)]	[Unknown]	Uncertain
Okmok	1899	Unknown	Confirmed	3	Observations: Reported
St. Helens	[1898 Apr 5]	[Unknown]	Uncertain
Shishaldin	1898	Unknown	Confirmed	2	Observations: Reported
Kilauea	1897 Jun 24	1897 Jun 27	Confirmed	0	Observations: Reported
Shishaldin	[1897]	[Unknown]	Uncertain
Cleveland	1897	Unknown	Confirmed		Observations: Reported
Kilauea	1896 Jul 11	1896 Sep 25 ± 5 days	Confirmed	0	Observations: Reported
Mauna Loa	1896 Apr 21	1896 May 6	Confirmed	0	Observations: Reported
Kilauea	1896 Jan 3	1896 Jan 28	Confirmed	0	Observations: Reported
Akutan	1896	Unknown	Confirmed		Observations: Reported
Akutan	1895 Aug 1	1895 Aug 14	Confirmed	2	Observations: Reported
Rainier	[1894 Nov 21 (?)]	[1894 Dec 24 (?)]	Uncertain
Pavlof	1894	Unknown	Confirmed	2	Observations: Reported
Cleveland	1893	Unknown	Confirmed		Observations: Reported
Mauna Loa	1892 Nov 30	1892 Dec 3	Confirmed	0	Observations: Reported
Akutan	1892 Sep 23	Unknown	Confirmed	1	Observations: Reported
Veniaminof	1892 Aug 28	1892 Aug 30	Confirmed	3	Observations: Reported
Seguam	1892 Apr 15 ± 45 days	Unknown	Confirmed	3	Observations: Reported
Pavlof	1892	Unknown	Confirmed	2	Observations: Reported
Seguam	1891 Dec	Unknown	Confirmed	2	Observations: Reported
Mono Lake Volcanic Field	[1890 Aug 23 (?)]	[1890 Aug 23 (?)]	Uncertain
Alamagan	[1887 Nov 29]	[Unknown]	Uncertain
Mauna Loa	1887 Jan 16	1887 Jan 28 (?)	Confirmed	0	Observations: Reported
Akutan	1887	Unknown	Confirmed	0	Observations: Reported
Pavlof	1886	Unknown	Confirmed	2	Observations: Reported
Wrangell	[1884 Oct 26]	[1885 Feb 4]	Uncertain
Baker	[1884]	[Unknown]	Uncertain
Augustine	1883 Oct 6	1884 (?)	Confirmed	4	Observations: Reported
Bogoslof	1883 Sep 27 (in or before)	1895 ± 2 years	Confirmed	3	Observations: Reported
Guguan	1883 ± 1 years	Unknown	Confirmed	2	Observations: Reported
Makushin	1883	Unknown	Confirmed	2	Observations: Reported
Akutan	1883	Unknown	Confirmed	2	Observations: Reported
Shishaldin	1883	Unknown	Confirmed	2	Observations: Reported
Rainier	[1882]	[Unknown]	Uncertain
Mauna Loa	1880 Nov 5	1881 Aug 10	Confirmed	1	Observations: Reported
Baker	1880 Sep 7	1880 Nov 27	Confirmed	2	Observations: Reported
Mauna Loa	1880 May 1	1880 May 6	Confirmed	1	Observations: Reported
Shishaldin	[1880]	[1881]	Uncertain
Pavlof	1880	Unknown	Confirmed	1	Observations: Reported
Vsevidof	[1880]	[Unknown]	Uncertain
Mauna Loa	1879 Mar 9	1879 Mar 9 (?)	Confirmed	0	Observations: Reported
Rainier	[1879]	[Unknown]	Uncertain
Vsevidof	1878	Unknown	Confirmed	2	Observations: Reported
Okmok	1878	Unknown	Confirmed	2	Observations: Reported
Amukta	1878	Unknown	Confirmed		Observations: Reported
Mauna Loa	1877 Feb 14	1877 Feb 24	Confirmed	0	Observations: Reported
Mauna Loa	1876 Feb 13	1876 Feb 14 (?)	Confirmed	0	Observations: Reported
Farallon de Pajaros	1876 Jan 1 (?)	1876 Jan 3 (?)	Confirmed	2	Observations: Reported
Amukta	[1876]	[Unknown]	Uncertain
Iliamna	1876	Unknown	Confirmed	3	Observations: Reported
Mauna Loa	1875 Aug 11	1875 Aug 18 (?)	Confirmed	0	Observations: Reported
Mauna Loa	1875 Jan 10	1875 Feb 9 (?)	Confirmed	0	Observations: Reported
Veniaminof	1874 Jul 15 ± 45 days	Unknown	Confirmed	2	Observations: Reported
Mauna Loa	1873 Apr 20	1874 Oct 19 (?)	Confirmed	1	Observations: Reported
Mauna Loa	1873 Jan 6	1873 Jan 7 (?)	Confirmed	0	Observations: Reported
Yunaska	[1873]	[Unknown]	Uncertain
Gareloi	1873	Unknown	Confirmed	2	Observations: Reported
Semisopochnoi	1873	Unknown	Confirmed		Observations: Reported
Pagan	1873 (?)	Unknown	Confirmed	3	Observations: Reported
Mauna Loa	1872 Aug 9	1872 Sep	Confirmed	1	Observations: Reported
Farallon de Pajaros	1872 Jul 11	Unknown	Confirmed	2	Observations: Reported
Mauna Loa	1871 Aug 10	1871 Aug 30 (?)	Confirmed	0	Observations: Reported
Mauna Loa	[1870 Jan 1 (?)]	[1870 Jan 15 (?)]	Uncertain
Rainier	[1870]	[Unknown]	Uncertain
Baker	1870	Unknown	Confirmed	2	Observations: Reported
Baker	[1869 Jun]	[Unknown]	Uncertain
Hood	[1869]	[Unknown]	Uncertain
Mauna Loa	1868 Mar 27	1868 Apr 22	Confirmed	2	Observations: Reported
Baker	[1867 Mar]	[Unknown]	Uncertain
Akutan	1867	Unknown	Confirmed		Observations: Reported
Makushin	[1867]	[Unknown]	Uncertain
Iliamna	1867	Unknown	Confirmed	2	Observations: Reported
Ofu-Olosega	1866 Sep 12	1866 Nov 15 ± 5 days	Confirmed	2	Observations: Reported
Pavlof	1866 Mar 14	Unknown	Confirmed	2	Observations: Reported
Mauna Loa	1865 Dec 30	1866 Apr 29 (?)	Confirmed	0	Observations: Reported
Hood	1865 Sep 21	1866 Jan (?)	Confirmed	2	Observations: Reported
Shishaldin	[1865]	[Unknown]	Uncertain
Akutan	1865	Unknown	Confirmed		Observations: Reported
Makushin	1865	Unknown	Confirmed		Observations: Reported
Baker	[1865]	[Unknown]	Uncertain
Farallon de Pajaros	1864 Jan 7	Unknown	Confirmed	2	Observations: Reported
Alamagan	[1864 Jan]	[Unknown]	Uncertain
Pagan	1864	Unknown	Confirmed	1	Observations: Reported
Baker	1863 Jul	Unknown	Confirmed	2	Observations: Reported
Akutan	[1862]	[Unknown]	Uncertain
Baker	[1860 Dec]	[Unknown]	Uncertain
Baker	1859 Nov	1860 Apr 26 (?)	Confirmed	2	Observations: Reported
Hood	1859 Aug 15	1859 Aug 17	Confirmed	2	Observations: Reported
Mauna Loa	1859 Jan 23	1859 Nov 25	Confirmed	1	Observations: Reported
Baker	1858	Unknown	Confirmed	2	Observations: Reported
Rainier	[1858]	[Unknown]	Uncertain
St. Helens	1857 Apr	Unknown	Confirmed	2	Observations: Reported
Baker	[1856]	[Unknown]	Uncertain
Mauna Loa	1855 Aug 11	1856 Nov	Confirmed	1	Observations: Reported
Hood	[1854 Aug]	[Unknown]	Uncertain
St. Helens	1854 Feb	1854 Apr	Confirmed	2	Observations: Reported
Rainier	[1854]	[Unknown]	Uncertain
Baker	1854	Unknown	Confirmed	2	Observations: Reported
St. Helens	1853 Mar 15 ± 5 days	1853 Aug (?)	Confirmed	2	Observations: Reported
Hood	[1853]	[Unknown]	Uncertain
Baker	1852 Dec 1 ± 30 days	1853 Jan (?)	Confirmed	2	Observations: Reported
Mauna Loa	1852 Feb 17	1852 Mar 11 (?)	Confirmed	2	Observations: Reported
Akutan	1852	Unknown	Confirmed		Observations: Reported
Pavlof	[1852]	[Unknown]	Uncertain
Veniaminof	[1852]	[Unknown]	Uncertain
Ugashik-Peulik	[1852]	[Unknown]	Uncertain
Mauna Loa	1851 Aug 8	1851 Aug 11 ± 1 days	Confirmed	0	Observations: Reported
Baker	[1850 Mar]	[Unknown]	Uncertain
St. Helens	1850 Mar	1850 May (?)	Confirmed	2	Observations: Reported
Mauna Loa	1849 May	Unknown	Confirmed	0	Observations: Reported
St. Helens	[1849]	[Unknown]	Uncertain
St. Helens	1848 Apr 1 (in or before)	Unknown	Confirmed	2	Observations: Reported
Akutan	1848 Mar 5 ± 4 days	Unknown	Confirmed	2	Observations: Reported
St. Helens	1847 Mar 26	1847 Mar 30	Confirmed	2	Observations: Reported
Pavlof	1846 Aug	1846 Aug	Confirmed	2	Observations: Reported
Baker	[1846]	[Unknown]	Uncertain
Pavlof	1845 Aug 12	Unknown	Confirmed	2	Observations: Reported
Akutan	[1845]	[Unknown]	Uncertain
Makushin	[1844 ± 1 years]	[Unknown]	Uncertain
Atka Volcanic Complex	[1844]	[Unknown]	Uncertain
Mauna Loa	1843 Jan 9	1843 Apr 10 (?)	Confirmed	0	Observations: Reported
Baker	1843	Unknown	Confirmed	3	Observations: Reported
Rainier	[1843]	[Unknown]	Uncertain
Iliamna	[1843]	[Unknown]	Uncertain
St. Helens	1842 Nov 22	1845 Sep 18 (?)	Confirmed	3	Observations: Reported
Shishaldin	1842	Unknown	Confirmed	2	Observations: Reported
Veniaminof	1838 Aug 4	1839 Apr	Confirmed	3	Observations: Reported
Pavlof	1838	Unknown	Confirmed	1	Observations: Reported
Shishaldin	1838	Unknown	Confirmed	2	Observations: Reported
Carlisle	[1838]	[Unknown]	Uncertain
Akutan	[1838]	[Unknown]	Uncertain
St. Helens	1835 Mar (?)	Unknown	Confirmed	2	Observations: Reported
Mauna Loa	1832 Jun 20	1832 Jul 15 ± 7 days	Confirmed	0	Observations: Reported
St. Helens	1831 Aug	Unknown	Confirmed	3	Observations: Reported
Shishaldin	1830 Nov 16 ± 15 days	1831 Mar 16 ± 15 days	Confirmed	3	Observations: Reported
Fisher	1830 Aug	Unknown	Confirmed	2	Observations: Reported
Veniaminof	[1830]	[1838]	Uncertain
Vsevidof	1830	Unknown	Confirmed		Observations: Reported
Yunaska	1830	Unknown	Confirmed	2	Observations: Reported
Semisopochnoi	[1830]	[Unknown]	Uncertain
Tanaga	1829	Unknown	Confirmed		Observations: Reported
Atka Volcanic Complex	[1829]	[1830]	Uncertain
Great Sitkin	[1829]	[Unknown]	Uncertain
Kanaga	[1829]	[Unknown]	Uncertain
Great Sitkin	[1828]	[Unknown]	Uncertain
Kasatochi	[1828]	[Unknown]	Uncertain
Carlisle	1828	Unknown	Confirmed		Observations: Reported
Akutan	[1828]	[Unknown]	Uncertain
Gareloi	[1828]	[1829]	Uncertain
Little Sitkin	1828	1830	Confirmed		Observations: Reported
Makushin	[1827]	[1838]	Uncertain
Westdahl	1827	1830	Confirmed	2	Observations: Reported
Seguam	[1827]	[Unknown]	Uncertain
Kasatochi	[1827]	[Unknown]	Uncertain
Kanaga	[1827]	[Unknown]	Uncertain
Shishaldin	1827	1829	Confirmed	2	Observations: Reported
Fisher	1826 Oct 11	1827 Jan (?)	Confirmed	3	Observations: Reported
Makushin	1826 Jun	Unknown	Confirmed	3	Observations: Reported
Shishaldin	1826	Unknown	Confirmed	0	Observations: Reported
Shishaldin	1825	Unknown	Confirmed	2	Observations: Reported
Pavlof	1825	Unknown	Confirmed	2	Observations: Reported
Pagan	1825 ± 5 years	Unknown	Confirmed	2	Observations: Reported
Shishaldin	1824	Unknown	Confirmed	3	Observations: Reported
Okmok	1824	1830	Confirmed		Observations: Reported
Yunaska	1824	Unknown	Confirmed	3	Observations: Reported
Kilauea	1823 Feb	1894 Dec 6	Confirmed	0	Observations: Reported
Kilauea	1820 (?)	Unknown	Confirmed	2	Observations: Reported
Baker	1820 (?)	Unknown	Confirmed	2	Observations: Reported
Westdahl	1820	Unknown	Confirmed	2	Observations: Reported
Wrangell	[1819]	[Unknown]	Uncertain
Redoubt	[1819]	[Unknown]	Uncertain
Makushin	[1818]	[Unknown]	Uncertain
Okmok	1817 Mar 1	1820	Confirmed	3	Observations: Reported
Vsevidof	1817	Unknown	Confirmed	3	Observations: Reported
Yunaska	[1817]	[Unknown]	Uncertain
Pavlof	1817	Unknown	Confirmed	2	Observations: Reported
Ugashik-Peulik	1814	Unknown	Confirmed	3	Observations: Reported
Augustine	1812	Unknown	Confirmed	3	Observations: Reported
Atka Volcanic Complex	1812	Unknown	Confirmed	3	Observations: Reported
Bogoslof	1806	1823	Confirmed	2	Observations: Reported
Okmok	1805	Unknown	Confirmed		Observations: Reported
Makushin	1802	Unknown	Confirmed	3	Observations: Reported
St. Helens	1800 Jan 15 ± 120 days	Unknown	Confirmed	5	Sidereal: Dendrochronology
Hualalai	1800	1801	Confirmed	0	Observations: Reported
Pagan	1800 ± 50 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Bogoslof	1796 May	1804	Confirmed	3	Observations: Reported
Westdahl	1796	Unknown	Confirmed	0	Observations: Reported
Amak	1796	Unknown	Confirmed		Observations: Reported
Fisher	1795 (in or before)	Unknown	Confirmed		Observations: Reported
Westdahl	1795	Unknown	Confirmed	4	Observations: Reported
Iliamna	[1793]	[Unknown]	Uncertain
Baker	[1792 Jun]	[Unknown]	Uncertain
Great Sitkin	1792 May 26 ± 5 days	Unknown	Confirmed		Observations: Reported
Makushin	[1792 Feb 14]	[Unknown]	Uncertain
Gareloi	1792	Unknown	Confirmed	2	Observations: Reported
Semisopochnoi	[1792]	[Unknown]	Uncertain
Tanaga	[1791 Jun 7]	[Unknown]	Uncertain
Gareloi	1791	Unknown	Confirmed	2	Observations: Reported
Kilauea	1790 Nov (?)	Unknown	Confirmed	4	Observations: Reported
Makushin	[1790 Jun 7]	[Unknown]	Uncertain
Vsevidof	[1790 May 30]	[Unknown]	Uncertain
Akutan	[1790]	[Unknown]	Uncertain
Shishaldin	[1790]	[Unknown]	Uncertain
Pavlof	1790	Unknown	Confirmed	2	Observations: Reported
Gareloi	1790	Unknown	Confirmed	2	Observations: Reported
Semisopochnoi	[1790]	[Unknown]	Uncertain
Kilauea	1790 (?)	Unknown	Confirmed	0	Observations: Reported
Mono Lake Volcanic Field	1790 ± 75 years	Unknown	Confirmed		Correlation: Tephrochronology
Amukta	1786 Jun	1791	Confirmed	3	Observations: Reported
Seguam	1786	1790	Confirmed		Observations: Reported
Iliamna	[1786]	[Unknown]	Uncertain
Wrangell	[1784 Jul]	[Unknown]	Uncertain
Hualalai	1784 ± 7 years	Unknown	Confirmed	0	Observations: Reported
Great Sitkin	[1784]	[Unknown]	Uncertain
Vsevidof	[1784]	[Unknown]	Uncertain
Kanaga	1783 (?)	1787 (?)	Confirmed		Observations: Reported
Hood	1781 Oct 15 ± 45 days	1801 (?)	Confirmed		Sidereal: Dendrochronology
Iliamna	1778	1779	Confirmed		Observations: Reported
Little Sitkin	1776	Unknown	Confirmed	1	Observations: Reported
Shishaldin	[1775]	[1778]	Uncertain
Asuncion	[1775 ± 10 years]	[Unknown]	Uncertain
Carlisle	1774 Jul 2 ± 182 days	Unknown	Confirmed		Observations: Reported
Semisopochnoi	[1772]	[Unknown]	Uncertain
Amukta	[1770]	[Unknown]	Uncertain
Makushin	1768	1769	Confirmed	3	Observations: Reported
Iliamna	[1768]	[Unknown]	Uncertain
Tanaga	[1763]	[1770]	Uncertain
Kanaga	[1763]	[Unknown]	Uncertain
Pavlof	1762	1786	Confirmed	4	Unknown
Gareloi	[1760]	[Unknown]	Uncertain
Great Sitkin	[1760]	[Unknown]	Uncertain
Kasatochi	1760	Unknown	Confirmed	0	Observations: Reported
Mauna Loa	1750 (?)	Unknown	Confirmed	0	Observations: Reported
Haleakala	1750 (?)	Unknown	Confirmed		Correlation: Anthropology
Kilauea	1750 (?)	Unknown	Confirmed	0	Observations: Reported
Mauna Loa	1730 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Snowy Mountain	1710 ± 200 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Amak	1700	1710	Confirmed		Observations: Reported
Kilauea	1700 ± 25 years	Unknown	Confirmed	0	Correlation: Magnetism
Glacier Peak	1700 ± 100 years	Unknown	Confirmed	2	Correlation: Tephrochronology
Asuncion	[1690 ± 10 years]	[Unknown]	Uncertain
Mauna Loa	1685 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Mauna Loa	1680 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Pagan	1669	Unknown	Confirmed		Observations: Reported
Lassen Volcanic Center	1666 (?)	Unknown	Confirmed	3	Sidereal: Dendrochronology
Iliamna	1650 (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Augustine	1650 ± 100 years	Unknown	Confirmed		Correlation: Tephrochronology
Mauna Loa	1650 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Hualalai	1650 ± 50 years	Unknown	Confirmed	1	Isotopic: 14C (uncalibrated)
Lassen Volcanic Center	[1650 (?)]	[Unknown]	Uncertain
Kilauea	1650 ± 50 years	Unknown	Confirmed	0	Correlation: Tephrochronology
Redoubt	1650 ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Spurr	1650 ± 50 years	Unknown	Confirmed		Correlation: Tephrochronology
Mauna Loa	1640 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Kilauea	1610 ± 50 years	Unknown	Confirmed	1	Isotopic: 14C (uncalibrated)
St. Helens	1610 ± 40 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mono Lake Volcanic Field	1550 ± 300 years	Unknown	Confirmed		Correlation: Tephrochronology
Tanaga	1550 (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Takawangha	1550 (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Mauna Loa	1540 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Augustine	1540 ± 100 years	Unknown	Confirmed	4	Isotopic: 14C (calibrated)
Aniakchak	1540 ± 100 years	Unknown	Confirmed	4	Isotopic: 14C (calibrated)
Redoubt	1530 ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
St. Helens	1525 ± 25 years	Unknown	Confirmed		Sidereal: Dendrochronology
Mauna Loa	1510 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	1510 ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Kilauea	1510 ± 50 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Mauna Loa	1500 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Kilauea	1500 (?)	Unknown	Confirmed	1	Isotopic: 14C (calibrated)
Kilauea	1490 ± 16 years	Unknown	Confirmed	1	Isotopic: 14C (calibrated)
St. Helens	1482 Jan 15 ± 120 days	Unknown	Confirmed	5	Sidereal: Dendrochronology
St. Helens	1480 Jan 15 ± 120 days	Unknown	Confirmed	5	Sidereal: Dendrochronology
Mauna Loa	1470 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Aniakchak	1470 ± 20 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Haleakala	1460 ± 75 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Kilauea	1460 ± 50 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Rainier	1450 ± 100 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mauna Loa	1440 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Akutan	1420 ± 100 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Haleakala	1420 ± 100 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Kilauea	1410 (?)	1470 (?)	Confirmed	0	Isotopic: 14C (calibrated)
Redoubt	1400 ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Kanaga	1400 ± 50 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mauna Loa	1390 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Mono-Inyo Craters	1380 ± 50 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mauna Loa	1370 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Aniakchak	1370 ± 55 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mauna Loa	1360 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Haleakala	1360 ± 100 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Redoubt	1360 ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Haleakala	1350 ± 150 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mono-Inyo Craters	1350 ± 20 years	Unknown	Confirmed	4	Sidereal: Dendrochronology
Kilauea	1340 ± 40 years	Unknown	Confirmed	0	Correlation: Anthropology
Pagan	1340 ± 100 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mauna Loa	1310 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Glacier Peak	[1300 ± 300 years]	[Unknown]	Uncertain
Black Rock Desert	1290 ± 150 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Aniakchak	1280 ± 145 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mammoth Mountain	1260 ± 40 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Shasta	1250 (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Hualalai	1240 ± 150 years	Unknown	Confirmed	2	Isotopic: 14C (uncalibrated)
Augustine	1230 ± 50 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Shasta	1200 (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Redoubt	1200 ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Hayes	1200 ± 300 years	Unknown	Confirmed		Correlation: Tephrochronology
Haleakala	1200 ± 75 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mauna Loa	1190 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Aniakchak	1190 ± 30 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mauna Loa	1170 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	1160 ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Hualalai	1150 (?)	Unknown	Confirmed	0	Correlation: Tephrochronology
Mono Lake Volcanic Field	1150 ± 200 years	Unknown	Confirmed		Chem/Bio: Hydration Rind
Kanaga	1150 ± 100 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Makushin	1150 ± 500 years	Unknown	Confirmed		Correlation: Tephrochronology
Kilauea	1140 ± 75 years	Unknown	Confirmed	0	Isotopic: 14C (calibrated)
Mauna Loa	1130 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	1120 ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Aniakchak	1120 ± 80 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Uinkaret Field	1100 ± 75 years	Unknown	Confirmed	1	Correlation: Anthropology
Haleakala	1080 ± 40 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
San Francisco Volcanic Field	1075 ± 25 years	Unknown	Confirmed	4	Correlation: Magnetism
Mauna Loa	1070 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Medicine Lake	1060 (?)	Unknown	Confirmed	3	Isotopic: 14C (calibrated)
Markagunt Plateau	1050 (in or before)	Unknown	Confirmed		Unknown
Kilauea	1050 ± 75 years	Unknown	Confirmed	1	Isotopic: 14C (uncalibrated)
Hualalai	1050 ± 100 years	Unknown	Confirmed	1	Isotopic: 14C (uncalibrated)
Aniakchak	1050 (?)	Unknown	Confirmed		Correlation: Tephrochronology
Ugashik-Peulik	1050 ± 100 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Tanaga	1050 (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Mauna Loa	1040 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	1030 ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Haleakala	1020 ± 50 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Haleakala	1010 ± 40 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Medicine Lake	1010 (?)	Unknown	Confirmed	3	Isotopic: 14C (calibrated)
Mono-Inyo Craters	1000 ± 200 years	Unknown	Confirmed		Chem/Bio: Hydration Rind
Haleakala	0990 ± 50 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Haleakala	0980 ± 50 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Lassen Volcanic Center	0980 ± 300 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Shishaldin	0950 (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Jefferson	0950 (?)	Unknown	Confirmed		Sidereal: Varve Count
Adams	0950 (?)	Unknown	Confirmed	2	Correlation: Tephrochronology
Mauna Loa	0940 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Augustine	0930 ± 150 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Hualalai	0920 ± 50 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Haleakala	0910 ± 40 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Rainier	0910 ± 500 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Glacier Peak	0900 ± 50 years	Unknown	Confirmed	3	Isotopic: 14C (uncalibrated)
Kilauea	0900 ± 50 years	Unknown	Confirmed		Correlation: Tephrochronology
Lassen Volcanic Center	0880 ± 300 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Alamagan	0870 ± 100 years	Unknown	Confirmed	4	Isotopic: 14C (uncalibrated)
Shasta	0850 (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Kilauea	0850 ± 150 years	Unknown	Confirmed	0	Isotopic: 14C (calibrated)
Kanaga	0850 ± 200 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Churchill	0847 ± 1 years	Unknown	Confirmed	6	Correlation: Tephrochronology
Medicine Lake	0840 (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Medicine Lake	0830 (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mauna Loa	0830 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Mauna Loa	0810 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Lassen Volcanic Center	0800 ± 300 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Haleakala	0790 ± 50 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Medicine Lake	0780 (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
St. Helens	0780 ± 300 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Hualalai	0770 ± 200 years	Unknown	Confirmed	1	Isotopic: 14C (uncalibrated)
Redoubt	0720 ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Aniakchak	0700 ± 250 years	Unknown	Confirmed	0	Correlation: Tephrochronology
Newberry	0690 ± 100 years	Unknown	Confirmed	4	Isotopic: 14C (calibrated)
Blue Lake Crater	0680 ± 200 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Kilauea	0680 ± 75 years	Unknown	Confirmed	1	Isotopic: 14C (uncalibrated)
Mauna Loa	0680 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	0640 ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Mauna Loa	0630 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Mono-Inyo Craters	0620 ± 27 years	Unknown	Confirmed	4	Isotopic: 14C (calibrated)
Mauna Loa	0600 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	0580 ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Augustine	0570 ± 150 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Akutan	0550 (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Mauna Loa	0550 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Kilauea	0540 ± 200 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Alamagan	0540 ± 75 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Redoubt	0520 ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Mono-Inyo Craters	0490 ± 100 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Newberry	0490 ± 100 years	Unknown	Confirmed	4	Isotopic: 14C (calibrated)
Hood	0480 ± 37 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mauna Loa	0480 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Belknap	0475 ± 215 years	Unknown	Confirmed	2	Isotopic: 14C (calibrated)
Aniakchak	0460 (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Kilauea	0450 (in or before)	Unknown	Confirmed	0	Correlation: Magnetism
Mauna Loa	0450 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Mono-Inyo Craters	0440 ± 100 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Redoubt	0440 ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Rainier	0440 ± 100 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Tutuila	0440 ± 200 years	Unknown	Confirmed	3	Isotopic: 14C (calibrated)
Three Sisters	0439 ± 108 years	Unknown	Confirmed	2	Isotopic: 14C (calibrated)
Kilauea	0420 ± 20 years	Unknown	Confirmed		Correlation: Tephrochronology
St. Helens	0420 (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Fisher	0400 ± 50 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Mauna Loa	0350 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Mono Lake Volcanic Field	0350 ± 100 years	Unknown	Confirmed		Correlation: Tephrochronology
Akutan	0340 (?)	Unknown	Confirmed	5	Isotopic: 14C (uncalibrated)
Augustine	0340 ± 40 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mono-Inyo Craters	0320 ± 200 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mauna Loa	0300 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Imuruk Lake	0300 (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Redoubt	0290 ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Mono-Inyo Craters	0290 ± 50 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
St. Helens	0270 (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Seguam	0250 ± 500 years	Unknown	Confirmed		Isotopic: Uranium-series
St. Helens	0230 (?)	Unknown	Confirmed	0	Correlation: Tephrochronology
Salton Buttes	0210 ± 100 years	Unknown	Confirmed		Correlation: Magnetism
Mauna Loa	0200 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Adams	0200 (?)	Unknown	Confirmed	2	Correlation: Tephrochronology
Glacier Peak	0200 ± 50 years	Unknown	Confirmed	4	Isotopic: 14C (uncalibrated)
Kanaga	0200 ± 150 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Aniakchak	0200 ± 255 years	Unknown	Confirmed		Correlation: Tephrochronology
St. Helens	0190 (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Redoubt	0190 ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Wrangell	0190 ± 200 years	Unknown	Confirmed	4	Isotopic: 14C (uncalibrated)
Mauna Loa	0150 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Shasta	0150 (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Kilauea	0150 ± 300 years	Unknown	Confirmed	0	Correlation: Magnetism
Redoubt	0110 ± 50 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
St. Helens	0100 (?)	Unknown	Confirmed	0	Isotopic: 14C (calibrated)
Mauna Loa	0100 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Haleakala	0080 ± 40 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Redoubt	0070 ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Churchill	0063 ± 200 years	Unknown	Confirmed	6	Isotopic: 14C (uncalibrated)
Shasta	0050 (?)	Unknown	Confirmed	0	Correlation: Tephrochronology
Mauna Loa	0050 (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Three Sisters	0040 ± 202 years	Unknown	Confirmed	2	Isotopic: 14C (calibrated)
Salton Buttes	0010 ± 100 years	Unknown	Confirmed		Correlation: Magnetism
Mono-Inyo Craters	0010 ± 200 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mauna Loa	0030 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Three Sisters	0050 BCE (?)	Unknown	Confirmed	3	Isotopic: 14C (uncalibrated)
Kilauea	0050 BCE ± 150 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Kama'ehuakanaloa	0050 BCE ± 3000 years	Unknown	Confirmed	0	Isotopic: K/Ar
Mauna Loa	0060 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Mauna Loa	0080 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Hualalai	0080 BCE ± 75 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	0090 BCE ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Redoubt	0100 BCE ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
St. Helens	0100 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Okmok	0100 BCE ± 50 years	Unknown	Confirmed	6	Isotopic: 14C (uncalibrated)
Augustine	0120 BCE ± 40 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Craters of the Moon	0130 BCE ± 50 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Ubehebe Craters	0150 BCE (?)	Unknown	Confirmed		Correlation: Magnetism
Shasta	0150 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Rainier	0150 BCE (?)	Unknown	Confirmed		Correlation: Tephrochronology
Redoubt	0160 BCE ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Kilauea	0200 BCE ± 150 years	Unknown	Confirmed	0	Isotopic: 14C (calibrated)
Mauna Loa	0200 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	0210 BCE ± 200 years	Unknown	Confirmed		Correlation: Tephrochronology
Redoubt	0220 BCE ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
St. Helens	0220 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
St. Helens	0250 BCE (?)	Unknown	Confirmed		Correlation: Tephrochronology
Rainier	0250 BCE ± 200 years	Unknown	Confirmed	4	Isotopic: 14C (calibrated)
Craters of the Moon	0260 BCE ± 25 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Kilauea	0270 BCE ± 75 years	Unknown	Confirmed	0	Isotopic: 14C (calibrated)
Redoubt	0270 BCE ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
St. Helens	0280 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Haleakala	0290 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Salton Buttes	0290 BCE ± 100 years	Unknown	Confirmed		Correlation: Magnetism
Wapi Lava Field	0300 BCE (?)	Unknown	Confirmed	2	Correlation: Tephrochronology
Adams	0300 BCE (?)	Unknown	Confirmed	2	Correlation: Tephrochronology
Mauna Loa	0300 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Augustine	0310 BCE ± 100 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Augustine	0350 BCE ± 200 years	Unknown	Confirmed		Correlation: Tephrochronology
Ukinrek Maars	0350 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Hualalai	0350 BCE ± 75 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	0350 BCE ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Craters of the Moon	0350 BCE (?)	Unknown	Confirmed	0	Correlation: Magnetism
Three Sisters	0350 BCE (?)	Unknown	Confirmed	4	Isotopic: 14C (uncalibrated)
Aniakchak	0370 BCE ± 210 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Redoubt	0380 BCE ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Redoubt	0390 BCE ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Haleakala	0390 BCE ± 40 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Hualalai	0400 BCE ± 75 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Mauna Loa	0400 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	0400 BCE ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Adams	0400 BCE (?)	Unknown	Confirmed	2	Correlation: Tephrochronology
Rainier	0400 BCE ± 50 years	Unknown	Confirmed		Correlation: Tephrochronology
Kilauea	0410 BCE ± 100 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	0420 BCE ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Hualalai	0440 BCE ± 50 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	0450 BCE ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Iliamna	0450 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Redoubt	0470 BCE ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Rainier	0500 BCE ± 50 years	Unknown	Confirmed		Correlation: Tephrochronology
Mauna Loa	0500 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Mageik	0500 BCE ± 50 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
St. Helens	0530 BCE (?)	Unknown	Confirmed	5	Isotopic: 14C (calibrated)
Adams	0550 BCE ± 1000 years	Unknown	Confirmed	2	Correlation: Tephrochronology
Shasta	0550 BCE ± 500 years	Unknown	Confirmed		Correlation: Tephrochronology
Tanaga	0550 BCE ± 2500 years	Unknown	Confirmed		Correlation: Tephrochronology
Mageik	0550 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Makushin	0550 BCE ± 900 years	Unknown	Confirmed		Correlation: Tephrochronology
Haleakala	0580 BCE ± 50 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Mauna Loa	0600 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	0600 BCE ± 75 years	Unknown	Confirmed		Sidereal: Varve Count
Redoubt	0610 BCE ± 100 years	Unknown	Confirmed		Sidereal: Varve Count
Rainier	0610 BCE ± 100 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Redoubt	0620 BCE ± 100 years	Unknown	Confirmed		Sidereal: Varve Count
Rainier	0650 BCE ± 50 years	Unknown	Confirmed		Correlation: Tephrochronology
Shasta	0650 BCE ± 800 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Mageik	0650 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Redoubt	0670 BCE ± 100 years	Unknown	Confirmed		Sidereal: Varve Count
Belknap	0685 BCE ± 50 years	Unknown	Confirmed	2	Isotopic: 14C (calibrated)
Mono-Inyo Craters	0700 BCE ± 800 years	Unknown	Confirmed		Chem/Bio: Hydration Rind
Rainier	0700 BCE ± 50 years	Unknown	Confirmed		Correlation: Tephrochronology
Hualalai	0720 BCE ± 75 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	0770 BCE ± 100 years	Unknown	Confirmed		Sidereal: Varve Count
Redoubt	0790 BCE ± 100 years	Unknown	Confirmed		Sidereal: Varve Count
St. Helens	0800 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Three Sisters	0800 BCE (?)	Unknown	Confirmed	2	Correlation: Tephrochronology
Kilauea	0800 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (calibrated)
Martin	0800 BCE ± 50 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Yantarni	0800 BCE ± 500 years	Unknown	Confirmed	5	Correlation: Tephrochronology
St. Helens	0830 BCE ± 75 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Redoubt	0830 BCE ± 100 years	Unknown	Confirmed		Sidereal: Varve Count
Glacier Peak	0850 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Shasta	0850 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Redoubt	0870 BCE ± 100 years	Unknown	Confirmed		Sidereal: Varve Count
Mauna Loa	0950 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Sand Mountain Field	0950 BCE ± 200 years	Unknown	Confirmed	4	Correlation: Magnetism
Medicine Lake	1000 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
St. Helens	1010 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Redoubt	1040 BCE ± 100 years	Unknown	Confirmed		Sidereal: Varve Count
Redoubt	1050 BCE (?)	Unknown	Confirmed		Sidereal: Varve Count
Buzzard Creek	1050 BCE (?)	Unknown	Confirmed	2	Isotopic: 14C (uncalibrated)
Tanaga	1050 BCE (?)	Unknown	Confirmed	0	Isotopic: Ar/Ar
Belknap	1071 BCE ± 241 years	Unknown	Confirmed	0	Isotopic: 14C (calibrated)
Redoubt	1080 BCE ± 150 years	Unknown	Confirmed		Correlation: Tephrochronology
Hualalai	1080 BCE ± 200 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	1100 BCE ± 100 years	Unknown	Confirmed		Sidereal: Varve Count
St. Helens	1100 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Medicine Lake	1130 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (calibrated)
Haleakala	1140 BCE ± 30 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Hualalai	1150 BCE ± 75 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Shasta	1150 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Redoubt	1150 BCE ± 100 years	Unknown	Confirmed		Sidereal: Varve Count
Koniuji	1150 BCE ± 1900 years	Unknown	Confirmed		Isotopic: Ar/Ar
Zuni-Bandera	1170 BCE ± 300 years	Unknown	Confirmed	0	Isotopic: 14C (calibrated)
St. Helens	1180 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Redoubt	1210 BCE ± 100 years	Unknown	Confirmed		Sidereal: Varve Count
Haleakala	1240 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Jordan Craters	1250 BCE (after)	Unknown	Confirmed	2	Isotopic: 14C (uncalibrated)
St. Paul Island	1280 BCE ± 40 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Mauna Loa	1300 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Haleakala	1310 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Redoubt	1310 BCE ± 100 years	Unknown	Confirmed		Sidereal: Varve Count
Redoubt	1350 BCE ± 100 years	Unknown	Confirmed		Sidereal: Varve Count
Newberry	1450 BCE (?)	Unknown	Confirmed		Chem/Bio: Hydration Rind
Redoubt	1510 BCE ± 100 years	Unknown	Confirmed		Sidereal: Varve Count
Redoubt	1540 BCE ± 100 years	Unknown	Confirmed		Sidereal: Varve Count
Kanaga	1550 BCE ± 100 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Redoubt	1550 BCE ± 150 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Hayes	1550 BCE (?)	Unknown	Confirmed	5	Correlation: Tephrochronology
Kilauea	1550 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	1560 BCE ± 100 years	Unknown	Confirmed		Sidereal: Varve Count
Moffett	1600 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
St. Helens	1610 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Aniakchak	1645 BCE ± 10 years	Unknown	Confirmed	6	Sidereal: Ice Core
Mageik	1650 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Kilauea	1650 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Mauna Loa	1650 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Hualalai	1650 BCE ± 200 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Craters of the Moon	1680 BCE ± 150 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
St. Helens	1680 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Redoubt	1690 BCE ± 100 years	Unknown	Confirmed		Sidereal: Varve Count
Redoubt	1700 BCE ± 100 years	Unknown	Confirmed		Sidereal: Varve Count
Mauna Loa	1700 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Martin	1750 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Veniaminof	1750 BCE (?)	Unknown	Confirmed	6	Isotopic: 14C (uncalibrated)
Makushin	1750 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Mauna Loa	1750 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
St. Helens	1770 BCE ± 100 years	Unknown	Confirmed	5	Correlation: Tephrochronology
Griggs	1790 BCE ± 40 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mauna Loa	1800 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Haleakala	1800 BCE ± 50 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Redoubt	1810 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Augustine	1820 BCE ± 300 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Adams	1850 BCE (after)	Unknown	Confirmed	1	Correlation: Tephrochronology
Hayes	1850 BCE (?)	Unknown	Confirmed		Correlation: Tephrochronology
Haleakala	1850 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
St. Helens	1860 BCE (?)	Unknown	Confirmed	6	Isotopic: 14C (calibrated)
Redoubt	1870 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Dana	1890 BCE (?)	Unknown	Confirmed	5	Isotopic: 14C (uncalibrated)
Black Peak	1900 BCE ± 150 years	Unknown	Confirmed	6	Correlation: Tephrochronology
Kanaga	1900 BCE ± 300 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Haleakala	1900 BCE ± 50 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Mauna Loa	1900 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Haleakala	1940 BCE ± 40 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Mageik	1950 BCE ± 100 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Mauna Loa	2000 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Hualalai	2040 BCE ± 75 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	2040 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Augustine	2040 BCE ± 300 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Iliamna	2050 BCE (?)	Unknown	Confirmed	4	Isotopic: 14C (uncalibrated)
Shasta	2050 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Mauna Loa	2050 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Kilauea	2080 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (calibrated)
St. Helens	2100 BCE ± 300 years	Unknown	Confirmed		Correlation: Tephrochronology
Haleakala	2120 BCE ± 50 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Mauna Loa	2150 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Kanaga	2150 BCE ± 200 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Kilauea	2200 BCE ± 500 years	Unknown	Confirmed		Correlation: Tephrochronology
Dotsero	2200 BCE ± 300 years	Unknown	Confirmed	2	Isotopic: 14C (uncalibrated)
Haleakala	2210 BCE ± 40 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Redoubt	2230 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Mauna Loa	2250 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Haleakala	2260 BCE ± 40 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Escanaba Segment	2260 BCE (?)	Unknown	Confirmed	0	Isotopic: Uranium-series
Kanaga	2300 BCE ± 150 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
St. Helens	2340 BCE (?)	Unknown	Confirmed	5	Isotopic: 14C (calibrated)
Redoubt	2350 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Mauna Loa	2350 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Edgecumbe	2360 BCE ± 140 years	2080 BCE ± 90 years	Confirmed		Isotopic: 14C (uncalibrated)
Hualalai	2440 BCE ± 75 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Mauna Kea	2460 BCE ± 100 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Haleakala	2470 BCE ± 50 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mauna Kea	2540 BCE ± 200 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Rainier	2550 BCE (?)	Unknown	Confirmed	3	Isotopic: 14C (uncalibrated)
Shasta	2550 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Aniakchak	2550 BCE ± 500 years	Unknown	Confirmed		Correlation: Tephrochronology
Amak	2550 BCE ± 500 years	Unknown	Confirmed		Correlation: Tephrochronology
Craters of the Moon	2560 BCE ± 100 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Haleakala	2580 BCE ± 40 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Adams	2650 BCE ± 300 years	Unknown	Confirmed	2	Correlation: Tephrochronology
Koniuji	2650 BCE ± 2000 years	Unknown	Confirmed		Isotopic: Ar/Ar
Mauna Kea	2750 BCE ± 200 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Mauna Loa	2750 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Rainier	2750 BCE (?)	Unknown	Confirmed	2	Isotopic: 14C (uncalibrated)
Hualalai	2770 BCE ± 75 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Davis Lake	2790 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Redoubt	2830 BCE ± 200 years	Unknown	Confirmed		Sidereal: Varve Count
Crater Lake	2850 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Kilauea	2850 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	2860 BCE ± 200 years	Unknown	Confirmed		Sidereal: Varve Count
Redoubt	2920 BCE ± 200 years	Unknown	Confirmed		Sidereal: Varve Count
Adams	2950 BCE ± 100 years	Unknown	Confirmed	1	Correlation: Tephrochronology
North Gorda Ridge Segment	3020 BCE (?)	Unknown	Confirmed	0	Isotopic: Uranium-series
Redoubt	3030 BCE ± 200 years	Unknown	Confirmed		Sidereal: Varve Count
Shasta	3050 BCE ± 1000 years	Unknown	Confirmed	0	Correlation: Tephrochronology
Haleakala	3070 BCE ± 40 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Medicine Lake	3090 BCE	Unknown	Confirmed		Isotopic: 14C (calibrated)
Redoubt	3150 BCE ± 200 years	Unknown	Confirmed		Sidereal: Varve Count
Glacier Peak	3150 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Fisher	3170 BCE ± 75 years	Unknown	Confirmed	5	Isotopic: 14C (uncalibrated)
Redoubt	3180 BCE ± 200 years	Unknown	Confirmed		Sidereal: Varve Count
Medicine Lake	3190 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (calibrated)
Hell's Half Acre	3250 BCE ± 150 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Carrizozo	3250 BCE ± 500 years	Unknown	Confirmed		Isotopic: Cosmic Ray Exposure
Spurr	3250 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Adams	3250 BCE ± 300 years	Unknown	Confirmed	2	Correlation: Tephrochronology
Mauna Loa	3250 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Kilauea	3300 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (calibrated)
Mauna Loa	3350 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Mauna Kea	3370 BCE ± 150 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Glacier Peak	3550 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Adams	3550 BCE (?)	Unknown	Confirmed	2	Correlation: Tephrochronology
Redoubt	3600 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Redoubt	3650 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Rainier	3650 BCE (?)	Unknown	Confirmed	3	Isotopic: 14C (calibrated)
Makushin	3650 BCE ± 1850 years	Unknown	Confirmed	4	Correlation: Tephrochronology
Mauna Kea	3680 BCE ± 200 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Redoubt	3690 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Redoubt	3730 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Mauna Loa	3750 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Moffett	3750 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Adams	3800 BCE ± 1950 years	Unknown	Confirmed	1	Correlation: Tephrochronology
Edgecumbe	3810 BCE ± 70 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Rainier	3850 BCE ± 200 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mono-Inyo Craters	3850 BCE ± 1160 years	Unknown	Confirmed		Chem/Bio: Hydration Rind
Koniuji	3850 BCE ± 3100 years	Unknown	Confirmed		Isotopic: Ar/Ar
Kaguyak	3850 BCE (?)	Unknown	Confirmed	5	Isotopic: 14C (uncalibrated)
Redoubt	3890 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Redoubt	4010 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Spurr	4050 BCE (?)	Unknown	Confirmed		Correlation: Tephrochronology
Adams	4050 BCE ± 500 years	Unknown	Confirmed	2	Correlation: Tephrochronology
Shasta	4050 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Seguam	4050 BCE ± 4000 years	Unknown	Confirmed	0	Isotopic: Uranium-series
Mono-Inyo Craters	4050 BCE (?)	Unknown	Confirmed		Chem/Bio: Hydration Rind
Kaguyak	4060 BCE ± 150 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Craters of the Moon	4070 BCE ± 50 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Augustine	4150 BCE ± 100 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Akutan	4150 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Mauna Loa	4250 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Craters of the Moon	4250 BCE (?)	Unknown	Confirmed	0	Correlation: Tephrochronology
Redoubt	4360 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Mageik	4400 BCE ± 300 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Hualalai	4410 BCE ± 100 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Newberry	4450 BCE (?)	Unknown	Confirmed		Chem/Bio: Hydration Rind
Jefferson	4500 BCE ± 50 years	Unknown	Confirmed		Sidereal: Varve Count
Redoubt	4510 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Adams	4550 BCE (?)	Unknown	Confirmed	2	Correlation: Tephrochronology
Baker	4550 BCE (?)	Unknown	Confirmed	3	Isotopic: 14C (calibrated)
Craters of the Moon	4600 BCE ± 100 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Kilauea	4650 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Newberry	4690 BCE ± 150 years	Unknown	Confirmed	0	Isotopic: 14C (calibrated)
Kanaga	4700 BCE ± 150 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Haleakala	4760 BCE ± 40 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Newberry	4770 BCE ± 75 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Redoubt	4810 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
North Gorda Ridge Segment	4840 BCE (?)	Unknown	Confirmed	0	Isotopic: Uranium-series
Rainier	4850 BCE (?)	Unknown	Confirmed	2	Isotopic: 14C (calibrated)
Newberry	4860 BCE ± 150 years	Unknown	Confirmed	0	Isotopic: 14C (calibrated)
Redoubt	4900 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Hood	4940 BCE ± 150 years	Unknown	Confirmed	2	Isotopic: 14C (uncalibrated)
Newberry	4960 BCE ± 100 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Redoubt	4960 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Rainier	5050 BCE (?)	Unknown	Confirmed	3	Isotopic: 14C (calibrated)
Kama'ehuakanaloa	5050 BCE ± 5000 years	Unknown	Confirmed	0	Isotopic: K/Ar
Iliamna	5050 BCE (?)	Unknown	Confirmed	4	Isotopic: 14C (uncalibrated)
Sand Mountain Field	5050 BCE (?)	Unknown	Confirmed	2	Correlation: Magnetism
Belknap	5050 BCE (?)	Unknown	Confirmed		Correlation: Magnetism
Newberry	5070 BCE ± 150 years	Unknown	Confirmed	3	Isotopic: 14C (calibrated)
Seguam	5100 BCE ± 2000 years	Unknown	Confirmed	0	Isotopic: Uranium-series
Spurr	5110 BCE ± 100 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Adams	5150 BCE ± 500 years	Unknown	Confirmed	2	Correlation: Tephrochronology
Mauna Kea	5150 BCE ± 150 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Redoubt	5240 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Crater Lake	5250 BCE (?)	Unknown	Confirmed		Correlation: Tephrochronology
Newberry	5260 BCE ± 150 years	Unknown	Confirmed	0	Isotopic: 14C (calibrated)
Mauna Loa	5350 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Rainier	5350 BCE (?)	Unknown	Confirmed	3	Isotopic: 14C (calibrated)
Augustine	5420 BCE ± 50 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Craters of the Moon	5470 BCE ± 150 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Crater Lake	5550 BCE (?)	Unknown	Confirmed	0	Correlation: Tephrochronology
Rainier	5550 BCE (?)	Unknown	Confirmed	2	Isotopic: 14C (calibrated)
Redoubt	5580 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Diamond Craters	5610 BCE ± 470 years	Unknown	Confirmed	4	Isotopic: 14C (calibrated)
Mauna Loa	5650 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Crater Lake	5680 BCE ± 150 years	Unknown	Confirmed	7	Sidereal: Ice Core
West Crater	5750 BCE (?)	Unknown	Confirmed	2	Isotopic: 14C (uncalibrated)
Bachelor	5800 BCE ± 750 years	Unknown	Confirmed		Correlation: Magnetism
Redoubt	5820 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Mauna Loa	5850 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Ugashik-Peulik	5850 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Haleakala	5860 BCE ± 40 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Craters of the Moon	5890 BCE ± 150 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Crater Lake	5900 BCE ± 50 years	Unknown	Confirmed	6	Isotopic: 14C (calibrated)
Redoubt	5910 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Aniakchak	5930 BCE ± 240 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Redoubt	5940 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Redoubt	5950 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Haleakala	6030 BCE ± 40 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Redoubt	6050 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Spurr	6050 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Shasta	6050 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Makushin	6100 BCE ± 50 years	Unknown	Confirmed	5	Isotopic: 14C (uncalibrated)
West Crater	6110 BCE (?)	Unknown	Confirmed	2	Isotopic: 14C (uncalibrated)
Redoubt	6150 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Redoubt	6190 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Haleakala	6220 BCE ± 50 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Indian Heaven	6250 BCE ± 100 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Mauna Loa	6250 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	6280 BCE ± 150 years	Unknown	Confirmed		Sidereal: Varve Count
Aniakchak	6300 BCE ± 1250 years	Unknown	Confirmed	6	Correlation: Tephrochronology
Okmok	6310 BCE ± 500 years	Unknown	Confirmed	4	Isotopic: 14C (uncalibrated)
Mammoth Mountain	6540 BCE ± 90 years	Unknown	Confirmed	2	Isotopic: 14C (uncalibrated)
Mauna Loa	6550 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Ugashik-Peulik	6550 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Makushin	6650 BCE ± 200 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Mauna Loa	6650 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Shasta	6650 BCE (?)	Unknown	Confirmed		Correlation: Tephrochronology
Haleakala	6700 BCE ± 100 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Mono-Inyo Craters	6750 BCE ± 1740 years	Unknown	Confirmed		Chem/Bio: Hydration Rind
Haleakala	6760 BCE ± 40 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Hualalai	6820 BCE ± 200 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Kama'ehuakanaloa	7050 BCE ± 7000 years	Unknown	Confirmed	0	Isotopic: K/Ar
Adams	7050 BCE ± 1000 years	Unknown	Confirmed	2	Correlation: Tephrochronology
Shishaldin	7050 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Mauna Loa	7150 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Haleakala	7210 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Redoubt	7210 BCE ± 200 years	Unknown	Confirmed		Sidereal: Varve Count
Edgecumbe	7215 BCE ± 165 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Shasta	7250 BCE (?)	Unknown	Confirmed		Correlation: Tephrochronology
Redoubt	7270 BCE ± 200 years	Unknown	Confirmed		Sidereal: Varve Count
Seguam	7300 BCE ± 2250 years	Unknown	Confirmed	5	Isotopic: Ar/Ar
Kanaga	7300 BCE ± 500 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Shasta	7350 BCE (?)	Unknown	Confirmed	0	Correlation: Tephrochronology
Three Sisters	7350 BCE ± 2700 years	Unknown	Confirmed	2	Correlation: Tephrochronology
Mauna Loa	7350 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Redoubt	7380 BCE ± 200 years	Unknown	Confirmed		Sidereal: Varve Count
Mageik	7380 BCE ± 150 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Fisher	7420 BCE ± 200 years	Unknown	Confirmed	6	Isotopic: 14C (uncalibrated)
Shasta	7420 BCE ± 300 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Redoubt	7430 BCE ± 200 years	Unknown	Confirmed		Sidereal: Varve Count
Haleakala	7450 BCE ± 300 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Hualalai	7540 BCE ± 200 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Mauna Loa	7550 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Shishaldin	7550 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Haleakala	7570 BCE ± 75 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Roundtop	7600 BCE ± 500 years	Unknown	Confirmed	5	Correlation: Tephrochronology
Akutan	7620 BCE ± 300 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Shasta	7650 BCE ± 100 years	Unknown	Confirmed	4	Isotopic: 14C (uncalibrated)
Shasta	7750 BCE (?)	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Redoubt	7800 BCE ± 200 years	Unknown	Confirmed		Sidereal: Varve Count
Rainier	7800 BCE ± 300 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Baker	7850 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mauna Loa	7850 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Moffett	7850 BCE (?)	Unknown	Confirmed		Isotopic: 14C (calibrated)
Haleakala	7950 BCE ± 200 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Mauna Loa	8050 BCE (?)	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Shasta	8050 BCE (?)	Unknown	Confirmed		Correlation: Tephrochronology
Rainier	8050 BCE (?)	Unknown	Confirmed	3	Isotopic: 14C (calibrated)
Craters of the Moon	8290 BCE	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Black Butte Crater Lava Field	8400 BCE ± 300 years	Unknown	Confirmed	0	Isotopic: 14C (uncalibrated)
Mageik	8670 BCE ± 300 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Zuni-Bandera	8710 BCE ± 300 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Craters of the Moon	8720 BCE	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Craters of the Moon	9050 BCE	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Newberry	9210 BCE ± 1200 years	Unknown	Confirmed		Isotopic: 14C (calibrated)
Edgecumbe	9300 BCE ± 50 years	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Redoubt	9310 BCE ± 300 years	Unknown	Confirmed		Sidereal: Varve Count
Red Hill	9450 BCE ± 400 years	Unknown	Confirmed		Isotopic: Cosmic Ray Exposure
Red Hill	9700 BCE ± 450 years	Unknown	Confirmed		Isotopic: Cosmic Ray Exposure
Red Hill	9850 BCE ± 500 years	Unknown	Confirmed		Isotopic: Cosmic Ray Exposure
Craters of the Moon	10060 BCE	Unknown	Confirmed		Isotopic: 14C (uncalibrated)
Golden Trout Creek	55500 BCE ± 3500 years	Unknown	Confirmed		Isotopic: Cosmic Ray Exposure

United States has 176 Pleistocene volcanoes. Note that as a scientific organization we provide these listings for informational purposes only, with no international legal or policy implications. Volcanoes will be included on this list if they are within the boundaries of a country, on a shared boundary or area, in a remote territory, or within a maritime Exclusive Economic Zone. Suggestions and data updates are always welcome ().

Volcano Name	Volcanic Region	Primary Volcano Type
Adagdak	Aleutian Ridge Volcanic Arc	Composite
Addington Volcanic Field	Queen Charlotte Volcano Group	Cluster
Albuquerque	Basin and Range Volcanic Province	Cluster
Amboy	Basin and Range Volcanic Province	Minor
Aurora-Bodie	Basin and Range Volcanic Province	Cluster
Bailey	High Cascades Volcanic Arc	Shield
Bald Knoll	Basin and Range Volcanic Province	Minor
Basalt Knob	Queen Charlotte Volcano Group	Minor
Big Bunchgrass	High Cascades Volcanic Arc	Minor
Big Cave	High Cascades Volcanic Arc	Shield
Big Pine Volcanic Field	Basin and Range Volcanic Province	Minor
Black Butte	High Cascades Volcanic Arc	Minor
Black Butte	High Cascades Volcanic Arc	Composite
Black Crater	High Cascades Volcanic Arc	Shield
Blackfoot Lava Field	Basin and Range Volcanic Province	Cluster
Blacks Mountain	High Cascades Volcanic Arc	Shield
Blue Mountain	Alaska Peninsula Volcanic Arc	Cluster
Boring Lava	High Cascades Volcanic Arc	Cluster
Broken Top	High Cascades Volcanic Arc	Composite
Brown Mountain	High Cascades Volcanic Arc	Shield
Brushy Butte	High Cascades Volcanic Arc	Shield
Buffalo Valley	Basin and Range Volcanic Province	Cluster
Burney Mountain	High Cascades Volcanic Arc	Minor
Capital	Wrangell Volcanic Arc	Shield
Cappy Mountain	High Cascades Volcanic Arc	Composite
Caribou	High Cascades Volcanic Arc	Cluster
Cat Hills	Basin and Range Volcanic Province	Cluster
Central Segment	Northeast Pacific Rifts Volcanic Province	Cluster
Chamorro	Mariana Volcanic Arc	Unknown
Cheref	Mariana Volcanic Arc	Composite
China Hat-East Butte	High Lava Plains Volcanic Province	Minor
Cima Lava Field	Basin and Range Volcanic Province	Cluster
Cinder Butte	High Cascades Volcanic Arc	Shield
Clayton Valley	Basin and Range Volcanic Province	Minor
Copco Lake	High Cascades Volcanic Arc	Minor
Coso Volcanic Field	Basin and Range Volcanic Province	Cluster
Cowhorn Mountain	High Cascades Volcanic Arc	Shield
Crater Flat	Basin and Range Volcanic Province	Cluster
Cultus Mountain	High Cascades Volcanic Arc	Shield
Cupit Mary Mountain	High Cascades Volcanic Arc	Shield
Defiance	High Cascades Volcanic Arc	Shield
Devils Desk	Alaska Peninsula Volcanic Arc	Composite
Diamond Peak	High Cascades Volcanic Arc	Shield
Dittmar	High Cascades Volcanic Arc	Composite
Double Glacier	Alaska Peninsula Volcanic Arc	Minor
Drum	Wrangell Volcanic Arc	Composite
Eagle Lake Field	High Cascades Volcanic Arc	Cluster
East Molokai	Hawaiian-Emperor Hotspot Volcano Group	Shield
Eifuku	Mariana Volcanic Arc	Composite
Espenberg	Northern Alaska-Bering Sea Volcanic Province	Cluster
Fort Rock Volcanic Field	High Lava Plains Volcanic Province	Cluster
Four Craters Lava Field	High Lava Plains Volcanic Province	Cluster
Fuji Mountain	High Cascades Volcanic Arc	Shield
Fumarole Butte	Basin and Range Volcanic Province	Shield
Geronimo	Basin and Range Volcanic Province	Cluster
Gertrude Creek	Alaska Peninsula Volcanic Arc	Minor
Gilbert	Aleutian Ridge Volcanic Arc	Composite
Goat Rocks	High Cascades Volcanic Arc	Composite
Golden Trout Creek	Basin and Range Volcanic Province	Cluster
Goose Nest	High Cascades Volcanic Arc	Shield
Goosenest	High Cascades Volcanic Arc	Shield
Gordon	Wrangell Volcanic Arc	Minor
Cerro Grande	Yellowstone-Snake River Hotspot Volcano Group	Cluster
Hackamore	High Cascades Volcanic Arc	Cluster
Imagination Peak	High Cascades Volcanic Arc	Minor
Ingrichuak Hills	Northern Alaska-Bering Sea Volcanic Province	Minor
Inskip Hill	High Cascades Volcanic Arc	Minor
Irish Mountain	High Cascades Volcanic Arc	Shield
Isanotski Peaks	Aleutian Ridge Volcanic Arc	Composite
Jackies Butte	High Lava Plains Volcanic Province	Cluster
Jarvis	Wrangell Volcanic Arc	Composite
Jornada del Muerto	Basin and Range Volcanic Province	Shield
Jumbo Dome	Alaska Peninsula Volcanic Arc	Minor
Kaena	Hawaiian-Emperor Hotspot Volcano Group	Shield
Kahoolawe	Hawaiian-Emperor Hotspot Volcano Group	Shield
Kasuga 3	Mariana Volcanic Arc	Composite
Kauai	Hawaiian-Emperor Hotspot Volcano Group	Shield
Kaula	Hawaiian-Emperor Hotspot Volcano Group	Shield
Kohala	Hawaiian-Emperor Hotspot Volcano Group	Shield
Kolob	Basin and Range Volcanic Province	Cluster
Kookooligit Mountains	Northern Alaska-Bering Sea Volcanic Province	Shield
Koolau	Hawaiian-Emperor Hotspot Volcano Group	Shield
Lanai	Hawaiian-Emperor Hotspot Volcano Group	Shield
Latour Butte	High Cascades Volcanic Arc	Minor
Lava Butte	High Lava Plains Volcanic Province	Shield
Lava Mountain	High Lava Plains Volcanic Province	Cluster
Lava Mountains Volcanic Field	Basin and Range Volcanic Province	Minor
Lavic Lake	Basin and Range Volcanic Province	Cluster
Leucite Hills	Basin and Range Volcanic Province	Cluster
Long Valley	Basin and Range Volcanic Province	Caldera
Lost Lake Butte	High Cascades Volcanic Arc	Shield
Lucero	Basin and Range Volcanic Province	Cluster
Lunar Crater	Basin and Range Volcanic Province	Cluster
Maclaren River Volcanic Field	Northern Cordilleran Volcanic Province	Minor
Magee Peak	High Cascades Volcanic Arc	Composite
Mahukona	Hawaiian-Emperor Hotspot Volcano Group	Minor
Maiden Peak	High Cascades Volcanic Arc	Shield
Maidu	High Cascades Volcanic Arc	Composite
Malutut	Samoan Hotspot Volcano Group	Composite
Marble Mountain	High Cascades Volcanic Arc	Shield
McCoy	Basin and Range Volcanic Province	Minor
McLoughlin	High Cascades Volcanic Arc	Composite
Menan Buttes	Yellowstone-Snake River Hotspot Volcano Group	Minor
Mineral Mountains-Cove Fort	Basin and Range Volcanic Province	Cluster
Mountain Home-Kuna Lava Field	High Lava Plains Volcanic Province	Minor
Mountain Lakes	High Cascades Volcanic Arc	Cluster
Niihau	Hawaiian-Emperor Hotspot Volcano Group	Shield
Northeast Bank	Samoan Hotspot Volcano Group	Composite
Nunivak Island	Northern Alaska-Bering Sea Volcanic Province	Cluster
Ocate	Basin and Range Volcanic Province	Cluster
Olallie Butte	High Cascades Volcanic Arc	Shield
Pelican Butte	High Cascades Volcanic Arc	Shield
Phoenix Segment	Northeast Pacific Rifts Volcanic Province	Cluster
Pinto Basin-Salton Creek	Basin and Range Volcanic Province	Cluster
Potato Butte	High Cascades Volcanic Arc	Cluster
Potrillo Volcanic Field	Basin and Range Volcanic Province	Cluster
Poyo	Mariana Volcanic Arc	Composite
Prindle	Northern Cordilleran Volcanic Province	Minor
Quartz Mountain	High Lava Plains Volcanic Province	Minor
Rainbow Mountain	High Cascades Volcanic Arc	Composite
Raton-Clayton	Basin and Range Volcanic Province	Cluster
Red Lake Mountain	High Cascades Volcanic Arc	Minor
Red Top Mountain	High Cascades Volcanic Arc	Shield
Saddle Butte	High Lava Plains Volcanic Province	Cluster
San Carlos	Basin and Range Volcanic Province	Cluster
Sanford	Wrangell Volcanic Arc	Shield
Santa Clara	Basin and Range Volcanic Province	Cluster
Savonovski River Cluster	Alaska Peninsula Volcanic Arc	Composite
Scott Mountain	High Cascades Volcanic Arc	Shield
Selawik Hills	Northern Alaska-Bering Sea Volcanic Province	Cluster
Sentinel Plain	Basin and Range Volcanic Province	Cluster
Sergief	Aleutian Ridge Volcanic Arc	Composite
Sheldon-Antelope	Basin and Range Volcanic Province	Cluster
Sifford Mountain	High Cascades Volcanic Arc	Shield
Silver Creek	High Lava Plains Volcanic Province	Cluster
Silver Lake Volcanic Field	High Cascades Volcanic Arc	Cluster
Simcoe	High Cascades Volcanic Arc	Cluster
Sinker Butte	High Lava Plains Volcanic Province	Shield
Skookum Creek	Wrangell Volcanic Arc	Cluster
Smelter Knolls	Basin and Range Volcanic Province	Minor
Snow Mountain	High Cascades Volcanic Arc	Composite
Soso	Samoan Hotspot Volcano Group	Composite
South Daikoku	Mariana Volcanic Arc	Composite
Sprague River Valley	High Cascades Volcanic Arc	Cluster
Springerville Volcanic Field	Basin and Range Volcanic Province	Cluster
St. George	Northern Alaska-Bering Sea Volcanic Province	Cluster
Steamboat Springs	Basin and Range Volcanic Province	Minor
Sutter Buttes	California Coast Ranges Volcano Group	Minor
Table Mountain	High Cascades Volcanic Arc	Composite
Tamai	Samoan Hotspot Volcano Group	Composite
Tanada	Wrangell Volcanic Arc	Shield
Taos Plateau	Basin and Range Volcanic Province	Cluster
Taylor Butte	High Cascades Volcanic Arc	Shield
Taylor Volcanic Field	Basin and Range Volcanic Province	Composite
Thielsen	High Cascades Volcanic Arc	Shield
Three Fingered Jack	High Cascades Volcanic Arc	Shield
Tisa	Samoan Hotspot Volcano Group	Composite
Togiak Valley	Northern Alaska-Bering Sea Volcanic Province	Cluster
Tracey Seamount	Mariana Volcanic Arc	Composite
Trader Mountain	Aleutian Ridge Volcanic Arc	Composite
Tulaga	Samoan Hotspot Volcano Group	Composite
Tumac Mountain	High Cascades Volcanic Arc	Minor
Tumalo	High Cascades Volcanic Arc	Minor
Tumble Buttes	High Cascades Volcanic Arc	Minor
Twin Buttes	High Cascades Volcanic Arc	Cluster
Valles Caldera	Basin and Range Volcanic Province	Caldera
Waianae	Hawaiian-Emperor Hotspot Volcano Group	Shield
Washington	High Cascades Volcanic Arc	Shield
West Maui	Hawaiian-Emperor Hotspot Volcano Group	Shield
West Molokai	Hawaiian-Emperor Hotspot Volcano Group	Shield
Whaleback	High Cascades Volcanic Arc	Shield
Williamson Mountain	High Cascades Volcanic Arc	Shield
Willow Peak	Basin and Range Volcanic Province	Minor
Wilson	High Cascades Volcanic Arc	Shield
Wuksi Butte-Twin Lakes	High Cascades Volcanic Arc	Cluster
Yellowstone	Yellowstone-Snake River Hotspot Volcano Group	Caldera

Volcano Observatories
US Geological Survey (USGS) Volcano Hazards Program	Facebook
- USGS Volcanic Activity Reports and Notifications
- USGS Volcano Hazards Program Alert Levels
- USGS Hazard Notification System (HANS) for Volcanoes
USGS Volcano Observatories	Facebook Twitter
USGS Alaska Volcano Observatory (AVO)
- USGS AVO Reports
USGS Cascades Volcano Observatory (CVO)
- USGS CVO Reports
USGS California Volcano Observatory (CalVO)
- USGS CalVO
USGS Hawaii Volcano Observatory (HVO)
- USGS HVO
USGS Yellowstone Volcano Observatory (YVO)
- USGS YVO
USGS Northern Mariana Islands (NMI)

Civil Protection Agencies
Hawaiʻi County Civil Defense Agency	Twitter
Alaska Division of Homeland Security and Emergency Management	Twitter

Volcanic Ash Advisory Center
Anchorage Volcanic Ash Advisory Center (VAAC)
- Anchorage VAAC Archive
Washington Volcanic Ash Advisory Center (VAAC)
- Washington VAAC Archive
- Washington VAAC Notices

United States Volcanoes

Mauna Loa

Ta'u

Pavlof Sister

San Francisco Volcanic Field

Kama'ehuakanaloa

Augustine

Shasta

Black Butte Crater Lava Field

Steller

Redoubt

Redoubt

Pavlof

Kanaga

San Francisco Volcanic Field

Atka Volcanic Complex

Great Sitkin

Mono-Inyo Craters

St. Helens

Little Sitkin

Lassen Volcanic Center