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Smithsonian / USGS Weekly Volcanic Activity Report

Weekly Volcanic Activity Map

The Weekly Volcanic Activity Report is a cooperative project between the Smithsonian's Global Volcanism Program and the US Geological Survey's Volcano Hazards Program. Updated by 2300 UTC every Wednesday and averaging 16 reported volcanoes, this is not a comprehensive list of all eruptions this week, but rather a summary of activity that meet criteria discussed in the "Criteria and Disclaimers" section below.

Volcanic activity reported here is preliminary and subject to change. Carefully reviewed, detailed narratives over longer time periods are published as reports of the Bulletin of the Global Volcanism Network available through volcano profile pages.

Smithsonian / USGS Weekly Volcanic Activity Report for the week of 1 November-7 November 2023
Name Location Eruption Start Date Report Status
Ioto Volcano Islands 2023 Oct 30 New
Klyuchevskoy Central Kamchatka (Russia) 2023 Jun 22 New
Reykjanes Reykjanes Peninsula New
Aira Kyushu (Japan) 2017 Mar 25 Continuing
Dukono Halmahera 1933 Aug 13 Continuing
Ebeko Paramushir Island (Russia) 2022 Jun 11 Continuing
Great Sitkin Andreanof Islands (USA) 2021 May 25 Continuing
Lewotolok Lembata Island 2020 Nov 27 Continuing
Mayon Luzon (Philippines) 2023 Apr 27 ± 2 days Continuing
Merapi Central Java 2020 Dec 31 Continuing
Reventador Ecuador 2008 Jul 27 Continuing
Sabancaya Peru 2016 Nov 6 Continuing
Sangay Ecuador 2019 Mar 26 Continuing
Sheveluch Central Kamchatka (Russia) 1999 Aug 15 Continuing
Shishaldin Fox Islands (USA) 2023 Jul 12 Continuing
Suwanosejima Ryukyu Islands (Japan) 2004 Oct 23 Continuing
Ubinas Peru 2023 Jun 22 Continuing
Ulawun New Britain (Papua New Guinea) 2023 Jul 18 Continuing
Villarrica Central Chile 2014 Dec 2 ± 7 days Continuing
All times are local unless otherwise stated.
Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 19,850 individual reports over 1,208 weeks (average of 16 per week) on 332 different volcanoes.

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Agung Cuicocha Iliwerung Llaima Popocatepetl Sumbing
Ahyi Cumbal Inielika Lokon-Empung Purace Sundoro
Aira Dabbahu Ioto Lonquimay Puyehue-Cordon Caulle Suretamatai
Akan Davidof Irazu Lopevi Rabaul Suwanosejima
Alaid Dempo Iya Machin Raikoke Taal
Alu-Dalafilla Descabezado Grande Izu-Torishima Makushin Ranakah Tair, Jebel at
Ambae Dieng Volcanic Complex Jackson Segment Maly Semyachik Raoul Island Takawangha
Ambang Dukono Kaba Manam Rasshua Talang
Ambrym East Epi Kadovar Manda Hararo Raung Tambora
Anatahan Ebeko Kaitoku Seamount Marapi Redoubt Tanaga
Aniakchak Ebulobo Kama'ehuakanaloa Maroa Reventador Tandikat-Singgalang
Antillanca Volcanic Complex Edgecumbe Kambalny Martin Reykjanes Tangkoko-Duasudara
Antuco Egon Kanaga Masaya Rincon de la Vieja Tangkuban Parahu
Apoyeque Ekarma Kanlaon Maule, Laguna del Rinjani Tara, Batu
Arenal Eldey Karangetang Mauna Loa Ritter Island Ta'u
Asamayama Erebus Karkar Mayon Rotorua Taupo
Askja Erta Ale Karthala McDonald Islands Ruang Telica
Asosan Etna Karymsky Melimoyu Ruapehu Tenerife
Atka Volcanic Complex Etorofu-Yakeyama [Grozny Group] Kasatochi Merapi Ruby Tengger Caldera
Augustine Eyjafjallajokull Katla Midagahara Ruiz, Nevado del Three Sisters
Avachinsky Fagradalsfjall Katmai Misti, El Sabancaya Tinakula
Awu Fernandina Kavachi Miyakejima Sakar Tofua
Axial Seamount Fogo Kelimutu Momotombo Salak Tokachidake
Azul, Cerro Fonualei Kelud Monowai San Cristobal Tolbachik
Azumayama Fournaise, Piton de la Kerinci Montagu Island San Miguel Toliman
Bagana Fourpeaked Ketoi Moyorodake [Medvezhia] San Vicente Tongariro
Balbi Fuego Kharimkotan Mutnovsky Sangay Trident
Bamus Fujisan Kick 'em Jenny Myojinsho Sangeang Api Tungurahua
Banda Api Fukutoku-Oka-no-Ba Kie Besi Nabro Santa Ana Turrialba
Bardarbunga Galeras Kikai Negra, Sierra Santa Maria Ubinas
Barren Island Galunggung Kilauea Negro, Cerro Sao Jorge Ugashik-Peulik
Batur Gamalama Kirishimayama Nightingale Island Sarigan Ukinrek Maars
Bezymianny Gamkonora Kita-Ioto Nishinoshima Sarychev Peak Ulawun
Bogoslof Gareloi Kizimen Nisyros Saunders Unnamed
Brava Gaua Klyuchevskoy Novarupta Savo Unnamed
Bristol Island Gorely Kolokol Group NW Rota-1 Semeru Veniaminof
Bulusan Great Sitkin Koryaksky Nyamulagira Semisopochnoi Villarrica
Calbuco Grimsvotn Krakatau Nyiragongo Seulawah Agam Vulcano
Callaqui Guagua Pichincha Krummel-Garbuna-Welcker Ofu-Olosega Sheveluch West Mata
Cameroon Guallatiri Krysuvik-Trolladyngja Okataina Shishaldin Westdahl
Campi Flegrei del Mar di Sicilia Guntur Kuchinoerabujima Okmok Simbo Whakaari/White Island
Cayambe Hachijojima Kurikomayama Ontakesan Sinabung Witori
Chachadake [Tiatia] Hakoneyama Kusatsu-Shiranesan Oraefajokull Sinarka Wolf
Chaiten Heard Kverkfjoll Osorno Siple Wrangell
Chiginagak Hekla La Palma Pacaya Sirung Yakedake
Chikurachki Helgrindur Lamington Pagan Slamet Yasur
Chiles-Cerro Negro Hierro Lamongan Palena Volcanic Group Snaefellsjokull Yufu-Tsurumi
Chillan, Nevados de Hokkaido-Komagatake Langila Paluweh Soputan Zaozan [Zaosan]
Chirinkotan Home Reef Lanin Panarea Sorikmarapi Zavodovski
Chirpoi Hood Lascar Papandayan Sotara Zhupanovsky
Ciremai Huaynaputina Late Parker Soufriere Hills Zubair Group
Cleveland Hudson, Cerro Lateiki Pavlof Soufriere St. Vincent
Colima Huila, Nevado del Lengai, Ol Doinyo Pelee South Sarigan Seamount
Colo Hunga Tonga-Hunga Ha'apai Leroboleng Peuet Sague Spurr
Concepcion Ibu Lewotobi Pinatubo St. Helens
Copahue Ijen Lewotolok Planchon-Peteroa Stromboli
Cotopaxi Iliamna Little Sitkin Poas Sulu Range
 News Feeds and Google Placemarks


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The RSS (Really Simple Syndication) feed is identical to the Weekly Volcanic Activity Report minus some features including the header information (latitude and longitude and summit elevation), the Geologic Summary, and a link to the volcano's page from the Global Volcanism Program. At the end of each report is a list of the sources used. Each volcano report includes a link from the volcano's name back to the more complete information in the Weekly Volcanic Activity Report on the Smithsonian website. This feature was first made available on 5 March 2008.



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A Google Earth network link for the Weekly Volcanic Activity Report can be loaded into the free Google Earth software, and in turn will load placemarks for volcanoes in the current weekly report. Placemark balloons include the volcano name, report date, report text, sources, and links back to the GVP volcano profile page and to the complete Weekly Report for that week. This feature was first made available on 1 April 2009.

 Criteria & Disclaimers

Criteria



The Weekly Volcanic Activity Report does not necessarily include all volcanic activity that occurred on Earth during the week. More than a dozen volcanoes globally have displayed more-or-less continuous eruptive activity for decades or longer, and such routine activity is typically not reported here. Moreover, Earth's sea-floor volcanism is seldom reported even though in theory it represents the single most prolific source of erupted material. The Weekly Volcanic Activity Report summarizes volcanic activity that meets one or more of the following criteria:

- A volcano observatory raises or lowers the alert level at the volcano.
- A volcanic ash advisory has been released by a volcanic ash advisory center (VAAC) stating that an ash cloud has been produced from the volcano.
- A verifiable news report of new activity or a change in activity at the volcano has been issued.
- Observers have reported a significant change in volcanic activity. Such activity can include, but is not restricted to, pyroclastic flows, lahars, lava flows, dome collapse, or increased unrest.

Volcanoes are included in the "New Activity/Unrest" section of the Weekly Volcanic Activity Report if the activity occurs after at least 3 months of quiescence. Once a volcano is included in the "New Activity/Unrest" section, updates will remain in that section unless the activity continues for more than 1 month without escalating, after which time updates will be listed in the "Continuing Activity" section. Volcanoes are also included in the "New Activity/Unrest" section if the volcano is undergoing a period of relatively high unrest, or increasing unrest. This is commonly equal to Alert Level Orange on a scale of Green, Yellow, Orange, Red, where Red is the highest alert. Or alert level 3 on a scale of 1-4 or 1-5.

It is important to note that volcanic activity meeting one or more of these criteria may occur during the week, but may not be included in the Weekly Volcanic Activity Report because we did not receive a report.

Disclaimers



1. The Weekly Volcanic Activity Report is intended to provide timely information about global volcanism on a weekly basis. Consequently, the report is generated rapidly by summarizing volcanic reports from various sources, with little time for fact checking. The accuracy of the Weekly Volcanic Activity Report is dependent upon the quality of the volcanic activity reports we receive. Reports published in the Bulletin of the Global Volcanism Network are cover longer time periods and are more carefully reviewed, although all of the volcanoes discussed in the Weekly Volcanic Activity Report are not necessarily reported in the Bulletin. Because of our emphasis on rapid reporting on the web we have avoided diacritical marks. Reports are updated on the Weekly Volcanic Activity Report web page as they are received, therefore information may be included regarding events that occurred before the current report period.

2. Rapidly developing events lead to coverage that is often fragmentary. Volcanoes, their eruptions, and their plumes and associated atmospheric effects are complex phenomena that may require months to years of data analysis in order to create a comprehensive summary and interpretation of events.

3. Preliminary accounts sometimes contain exaggerations and "false alarms," and accordingly, this report may include some events ultimately found to be erroneous or misleading.

4. Many news agencies do not archive the articles they post on the Internet, and therefore the links to some sources may not be active. To obtain information about the cited articles that are no longer available on the Internet contact the source.

5. USGS Disclaimer Statement for this Website:

Information presented on this website is considered public information and may be distributed or copied. Use of appropriate byline/photo/image credit is requested. We strongly recommend that USGS data be acquired directly from a USGS server and not through other sources that may change the data in some way. While USGS makes every effort to provide accurate and complete information, various data such as names, telephone numbers, etc. may change prior to updating. USGS welcomes suggestions on how to improve our home page and correct errors. USGS provides no warranty, expressed or implied, as to the accuracy, reliability or completeness of furnished data.

Some of the documents on this server may contain live references (or pointers) to information created and maintained by other organizations. Please note that USGS does not control and cannot guarantee the relevance, timeliness, or accuracy of these outside materials.

For site security purposes and to ensure that this service remains available to all users, this government computer system employs software programs to monitor network traffic to identify unauthorized attempts to upload or change information, or otherwise cause damage. Unauthorized attempts to upload information or change information on this website are strictly prohibited and may be punishable under the Computer Fraud and Abuse Act of 1986 and the National Information Infrastructure Protection Act. Information may also be used for authorized law enforcement investigations. (Last modified September 21, 1999.)

U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
URL: https://volcano.si.edu/reports_weekly.cfm

 Acronyms and Abbreviations

a.s.l. - above sea level

AVO - Alaska Volcano Observatory

AVHRR - Advanced Very High Resolution Radiometer

CENAPRED - Centro Nacionale de Prevencion de Desastres (México)

CONRED - Coordinadora Nacional para la Reducción de Desastres

COSPEC - Correlation Spectrometer

CVGHM (formerly VSI) - Center of Volcanology and Geological Hazard Mitigation

CVO - Cascades Volcano Observatory (USGS)

GMS - Geostationary Meteorological Satellite

GOES - Geostationary Operational Environmental Satellite

GVO - Goma Volcano Observatory

GVP - Global Volcanism Program (Smithsonian Institution)

HVO - Hawaiian Volcano Observatory (USGS)

ICE - Instituto Costarricense de Electricidad (Costa Rica)

IG - Instituto Geofísico (Ecuador)

IGNS - Institute of Geological and Nuclear Sciences (New Zealand) - now GNS Science

INETER - Instituto Nicaragüense de Estudios Territoriales (Nicaragua)

INGEMMET - Instituto Geológical Minero y Metalúrgico (Peru)

INGEOMINAS - Instituto Colombiano de Geología y Minería (Colombia)

INGV-CT - Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Catania (Italy)

INSIVUMEH - Instituto Nacional de Sismologia, Vulcanologia, Meteorologia e Hidrologia (Guatemala)

IRD - Institut de Recherche pour le Développement (France)

JMA - Japanese Meteorological Agency

KEMSD - Kamchatkan Experimental and Methodical Seismilogical Department

KVERT - Kamchatkan Volcanic Eruption Response Team

M - magnitude

METEOSAT - Meteorological Satellite

MEVO - Mount Erebus Volcano Observatory

MODIS - Moderate Resolution Imaging Spectroradiometer

MVO - Montserrat Volcano Observatory

MWO - Meteorological Watch Office

NEIC - National Earthquake Information Center

NIED - National Research Institute for Earth Science and Disaster Prevention (Japan)

NOAA - National Oceanic and Atmospheric Administration

NOTAM - Notice to Airmen

OVDAS - Observatorio Volcanologico de los Andes del Sur (Chile)

OFDA - Office of US Foreign Disaster Assistance

ONEMI - Oficina Nacional de Emergencia - Ministerio del Interior (Chile)

OVPDLF - Observatoire Volcanologique du Piton de la Fournaise (France)

OVSICORI-UNA - Observatorio Vulcanologico y Sismologico de Costa Rica, Universidad Nacional (Costa Rica)

PHIVOLCS - Philippine Institute of Volcanology and Seismology (Philippines)

RSAM - Real-time Seismic Amplitude Measurement

RVO - Rabaul Volcano Observatory

SERNAGEOMIN - Servicio Nacional de Geologia y Mineria (Chile)

SIGMET - Significant Meteorological Information

SNET - Servicio Nacional de Estudios Territoriales (El Salvador)

SVERT - Sakhalin Volcanic Eruption Response Team (Russia)

USAID - US Agency for International Development

USGS - United States Geological Survey

UTC - Coordinated Universal Time

VAAC - Volcanic Ash Advisory Center

VAFTAD - Volcanic Ash Forecast Transport And Dispersion

VDAP - Volcano Disaster Assistance Program (USGS)

VHP - Volcano Hazards Program (USGS)

VRC - Volcano Research Center (Japan)

Report for Ioto
The eruption at Ioto (Iwo-jima), at a vent located about 1 km off the SE coast of Okinahama, continued during 1-3 November. A 2 November Sentinel satellite images showed a thermal anomaly at the SE end of the island which was elongated to the NNW-SSE. A white plume drifted about 400 m WSW. During an overflight on 3 November observers photographed the island and noted that a 169-m-high cone had formed at the SSE end according to news sources. Explosions occurred about every one minute that ejected dark material and incandescent material about 800 m above the vent. Floating, brown-colored pumice was present in the water around the island.
Sources: Asahi, Asahi, Sentinel Hub
Report for Klyuchevskoy
An intense eruption at Klyuchevskoy began on 31 October, prompting KVERT to raise the Aviation Color Code to Red (the highest level on a four-color scale). Ash plumes rose as high as 14 km (45,900 ft) a.s.l. and drifted as far as 2,255 km ESE during 31 October-1 November. Lava fountains rose as high has 1 km above the summit and fed lava flows that descended the Apakhonchichsky, Krestovsky, and Kozyrevsky drainages on the SE, S, and W flanks. According to Kamchatka Volcanological Station observers pyroclastic flows descended the flanks. Lahars descended the Studenoy River, blocking the Kozyrevsk-Petropavlovsk federal highway, and descended the Krutenkaya River, blocking the road E of Klyuchi. According to news articles the ash plumes caused some flight cancellations and disruptions in the Aleutians, British Columbia, and along flight paths connecting the Unites States to Japan and South Korea.

Activity began to wane at around 2300 on 1 November and by 2000 on 2 November ash plumes were rising only as high as 6.5 km (21,300 ft) a.s.l. and drifting NNE. The Aviation Color Code was lowered to Orange. The main plume from the most intense phase of the eruption had drifted more than 3,000 km E and SE and contained about 0.1 teragram (100,000 tonnes) of sulfur dioxide based on satellite data. Eruptive activity at the summit continued during 3-4 November, producing ash plumes that rose as high as 5.5 km (18,000 ft) a.s.l. and drifted 125 km ENE. The eruption had ceased by 5 November. Collapses of material and phreatic explosions from hot lava interacting with ice and snow along the Apakhonchichsky drainage generated ash plumes that rose 5.5-8.2 km (18,000-26,900 ft) a.s.l. and drifted almost 260 km E and ENE during 3 and 5-6 November.
Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Kamchatka Volcanological Station, Simon Carn, NewsBreak, Unalaska Community Broadcasting, CHEK Media
Report for Reykjanes
IMO reported that increased seismicity and deformation at the Reykjanes Peninsula were ongoing during 1-7 November and indicated magma accumulation at depths of 4-5 km in an area NW of Mt. Thorbjorn. A total of 7 cm of uplift was recorded in satellite data and by the Global Navigation Satellite System (GNSS) station near Mt. Thorbjorn during 27 October-6 November. The rate of inflation was fairly constant though it began to accelerate on 3 November. Data models indicated that the volume change associated with the uplift was double that of the four previous inflation events recorded during 2020-2022; the inflow of magma was estimated at 7 cubic meters per second, or four times greater than the highest inflow rate recorded during the previous events.

Intense seismicity continued. Over 10,500 earthquakes were detected during 25 October-1 November, out of which more than 26 exceeded M 3 and the largest was a M 4.5 recorded at 0818 on 25 October. Seismicity increased for early on 3 November, and then notably decreased around 1730. The signals were located along previously known faults, aligned in a N-S direction W of Mt. Thorbjorn. There was no indication of magma migrating to the surface. During 4-7 November there were around 2,200 earthquakes, which were located between Mt. Thorbjorn and Sýlingafell during 6-7 November.
Source: Icelandic Meteorological Office (IMO)
Report for Aira
JMA reported ongoing activity at Minamidake Crater (Aira Caldera’s Sakurajima volcano) during 30 October-6 November, with incandescence at the crater observed nightly. Sulfur dioxide emissions averaged 1,300 tons per day on 2 November. There was a total of 10 eruptive events recorded during 30-31 October and 1-2 November. Ash plumes rose as high as 1.8 km above the crater rim and drifted N, E, and SE. The Alert Level remained at 3 (on a 5-level scale), and the public was warned to stay 2 km away from both craters.
Source: Japan Meteorological Agency (JMA)
Report for Dukono
PVMBG reported that the eruption at Dukono was ongoing during 1-7 November. Daily dense white-and-gray or gray-to-black ash plumes rose as high as 1.2 km above the summit and drifted in multiple directions. Ashfall up to 0.5 mm thick fell in several areas downwind including Mede, Popilo, Gorua, Waro ino-Weri, Buwaele, Gura, Cina, Gamsungi, and Tobelo (15 km ENE). Banging noises were also heard several times in the same villages. The Alert Level remained at Level 2 (on a scale of 1-4), and the public was warned to remain outside of the 2-km exclusion zone.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Ebeko
KVERT reported that moderate explosive activity at Ebeko was ongoing during 26 October-2 November. According to volcanologists in Severo-Kurilsk (Paramushir Island, about 7 km E), explosions generated ash plumes that rose as high as 2.6 km (8,500 ft) a.s.l and drifted NE. A thermal anomaly was identified in satellite images on 28 October; weather clouds obscured views on other days. The Aviation Color Code remained at Orange (the third level on a four-color scale). Dates are UTC; specific events are in local time where noted.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Great Sitkin
AVO reported that slow lava effusion likely continued at Great Sitkin during 1-7 November, producing a thick flow in the summit crater that mainly expanded E. Seismicity was low with only a few earthquakes recorded by the seismic network during the week. Weakly elevated surface temperatures were identified in satellite data during 3-4 November. Weather clouds sometimes obscured views. The Volcano Alert Level remained at Watch (the third level on a four-level scale) and the Aviation Color Code remained at Orange (the third color on a four-color scale).
Source: US Geological Survey Alaska Volcano Observatory (AVO)
Report for Lewotolok
PVMBG reported that the eruption at Lewotolok continued during 1-7 November. White-and-gray ash plumes rose 100-400 m above the summit and drifted W and NW on 1 November. White steam-and-gas plumes rose 50-400 m and drifted W, NW, and E on the other days during the week. Webcam images captured at 1853 on 1 November and 0350 on 3 November showed incandescent material being ejected above the summit. Incandescence at the summit was visible in a webcam image at 2128 on 4 November. The Alert Level remained at 2 (on a scale of 1-4) and the public was warned to stay at least 2 km away from the summit crater.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Report for Mayon
PHIVOLCS reported that slow lava effusion at Mayon’s summit crater continued during 1-7 November. The lengths of the lava flow in the Mi-Isi (S), Bonga (SE), and Basud (E) drainages remained at 2.8 km, 3.4 km, and 1.1 km, respectively. Collapses at the lava dome produced rockfalls and occasional pyroclastic density currents (PDCs, or pyroclastic flows) that descended the flanks as far as 4 km. Each day, seismic stations recorded 84-175 rockfall events and 66-187 daily volcanic earthquakes including 62-179 tremor events that each lasted 1-49 minutes. There were 0-4 daily PDC events. Sulfur dioxide emissions, measured almost daily, averaged between 920 and 1,539 tonnes per day, with the highest value recorded on 1 November. The Alert Level remained at 3 (on a 0-5 scale) and residents were reminded to stay away from the 6-km-radius Permanent Danger Zone (PDZ). PHIVOLCS recommended that civil aviation authorities advise pilots to avoid flying close to the summit.
Source: Philippine Institute of Volcanology and Seismology (PHIVOLCS)
Report for Merapi
BPPTKG reported that the eruption at Merapi (on Java) continued during 27 October-2 November. The SW lava dome produced a total of 135 lava avalanches that descended the S and SW flanks; 16 traveled as far as 1.6 km down the upper part of the Boyong drainage and 119 traveled as far as 1.9 km down the upper Bebeng drainage. Morphological changes to the SW lava dome were due to continuous collapses of material. Seismicity remained at elevated levels. The Alert Level remained at 3 (on a scale of 1-4), and the public was warned to stay 3-7 km away from the summit, based on location.
Source: Balai Penyelidikan dan Pengembangan Teknologi Kebencanaan Geologi (BPPTKG)
Report for Reventador
IG-EPN reported that the eruption at Reventador was ongoing during 31 October-7 November. Seismicity was characterized by 37-52 daily explosions, long-period earthquakes, harmonic tremor, and tremor associated with emissions. Several daily ash-and-gas plumes rose as high as 1.2 km above the crater rim and drifted mainly N, NW, N, and NE. Daily crater incandescence was visible during both overnight and morning hours. Avalanches of incandescent material descended the flanks, traveling as far as 800 m from the summit. Incandescent material was ejected as high as 300 m above the crater rim several times during 4-7 November. Weather conditions sometimes prevented views of the volcano. Secretaría de Gestión de Riesgos maintained the Alert Level at Orange (the second highest level on a four-color scale).
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Report for Sabancaya
Instituto Geofísico del Perú (IGP) reported that the eruption at Sabancaya continued at moderate levels during 30 October-5 November with a daily average of five explosions. Gas-and-ash plumes rose as high as 2.2 km above the summit and drifted W, SW, and SE. A total of 12 thermal anomalies from the lava dome in the summit crater were detected using satellite data. Minor inflation was detected near the Hualca Hualca sector (4 km N). The Alert Level remained at Orange (the second highest level on a four-color scale) and the public were warned to stay outside of a 12 km radius.
Source: Instituto Geofísico del Perú (IGP)
Report for Sangay
IG-EPN reported a high level of eruptive activity at Sangay during 31 October-7 November, with seismic stations recording 436-1,122 daily explosions. Several ash-and-gas plumes per day during 1-4 and 6 November rose as high as 2.5 km above the crater rim and drifted NE, N, NW, and SW. Webcam images showed incandescent material descending the SE flank as far as 1.8 km from the crater each day during overnight and early morning hours. Incandescence at the crater was often visible; incandescent material was ejected as high as 1 km above the crater rim during 4-5 November. Secretaría de Gestión de Riesgos maintained the Alert Level at Yellow (the second highest level on a four-color scale).
Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Report for Sheveluch
KVERT reported that the eruption at Sheveluch continued during 26 October-2 November. A daily thermal anomaly was identified in satellite images. The Aviation Color Code remained at Orange (the third level on a four-color scale). Dates are based on UTC times; specific events are in local time where noted.
Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Report for Shishaldin
AVO reported that the thirteenth significant explosive event since 12 July was recorded at Shishaldin on 2 November. An increase in seismic and infrasound tremor amplitudes began at 1940 on 2 November, indicating a likely eruption. The Volcano Alert Level was raised to Watch (the third level on a four-level scale) and the Aviation Color Code was raised to Orange (the third color on a four-color scale), though ash was not identified in satellite data. At 2000 a sustained ash cloud drifting W was identified in satellite data at an altitude of 6.1 km (20,000 ft) a.s.l. By 0831 on 3 November ash emissions were no longer visible in satellite images and seismic and infrasound data indicated a decline in activity. During 4-7 November seismic activity remained elevated with ongoing tremor and small, low-frequency earthquakes. Minor emissions of steam and sulfur dioxide were visible in webcam and satellite images. Elevated surface temperatures were identified in satellite images on a few occasions. Infrasound signals consistent with small explosions were recorded during 5-7 November.
Source: US Geological Survey Alaska Volcano Observatory (AVO)
Report for Suwanosejima
JMA reported that the eruption at Suwanosejima's Ontake Crater continued during 30 October-6 November. Eruptive events during 30-31 October and 2 and 4 November generated ash plumes that rose as high as 1.5 km above the crater rim and drifted NW, S, and W; on 30 October and 4 November the ash plumes rose into weather clouds and may have gone higher than observed. The eruptive events ejected large blocks as far as 300 m from the vent. Alert Level remained at 2 (on a 5-level scale) and the public was warned to stay at least 1 km away from the crater.
Source: Japan Meteorological Agency (JMA)
Report for Ubinas
Instituto Geofísico del Perú (IGP) reported that activity at Ubinas was at low levels during 30 October-5 November. Seismicity was low with daily averages of 95 volcano-tectonic earthquakes indicating rock fracturing and 24 long-period earthquakes signifying the movement of gas and magma. Gas-and-steam plumes rose as high as 900 m above the crater rim and drifted E and SE; no explosions nor ash emissions were recorded. The Alert Level was lowered to Yellow (the second level on a four-color scale) and the public was warned to stay 2 km away from the crater.
Source: Instituto Geofísico del Perú (IGP)
Report for Ulawun
Rabaul Volcano Observatory (RVO) reported that diffuse white plumes rose from Ulawun’s summit crater on 1 November. A low booming noise was heard at 1945. Minor crater incandescence began to be visible later that day at around 2100 and was observed until sunrise. White emissions were visible early on 2 November but by the afternoon clouds of gray-to-brown ash were occasionally observed when weather permitted observations. Crater incandescence was again visible at nightfall but was more intense than the previous night and remained visible until sunrise. Seismicity was dominated by low-level volcanic tremor. Small, low-frequency earthquakes occurring at long intervals began to be recorded at some point before 2300 on 1 November; an increase in both magnitude and frequency occurred after 2300 and the signal again intensified after 0800 on 2 November. Seismicity slightly declined around 0800 on 3 November and remained at those levels at least through noon. The Alert Level remained at Stage 2 (on the four-level scale).
Source: Rabaul Volcano Observatory (RVO)
Report for Villarrica
According to the Buenos Aires VAAC a diffuse ash-and-gas plume from Villarrica was observed in satellite and webcam images at 0900 on 2 November rising to 3.7 km (12,000 ft) a.s.l. and dissipating near the summit. POVI reported that lava fountaining above the crater rim was visible in webcam images for more than 15 seconds on 3 November. Incandescence from the summit was visible during the early morning hours of 6 November. The Volcanic Alert level remained at Yellow (the third level on a four-level scale) according to SERNAGEOMIN and the public was warned to stay 2 km away from the crater. SENAPRED maintained the Alert Level at Yellow (the middle level on a three-color scale) for the communities of Villarrica, Pucón (16 km N), Curarrehue, and Panguipulli.
Sources: Servicio Nacional de Geología y Minería (SERNAGEOMIN), Sistema y Servicio Nacional de Prevención y Repuesta Ante Desastres (SENAPRED), Buenos Aires Volcanic Ash Advisory Center (VAAC), Proyecto Observación Villarrica Internet (POVI)