What was erupting in the year...?
There were 81 confirmed eruptions at some point during 2004 from 71 different volcanoes; 49 of those were new eruptions that started during the year. A stop date with "(continuing)" indicates that the eruption was considered to be ongoing as of the date indicated. Data is reported through the last data update (19 September 2025). Information about more recent eruptions can be found in the Smithsonian / USGS Weekly Volcanic Activity Report.
| Volcano | Country | Eruption Start Date | Eruption Stop Date | Eruption Type | Max VEI |
|---|---|---|---|---|---|
| San Cristobal | Nicaragua | 2004 Dec 3 | 2004 Dec 7 | Explosive / Effusive | 1 |
| Miyakejima | Japan | 2004 Nov 30 | 2004 Dec 9 | Explosive / Effusive | 1 |
| Langila | Papua New Guinea | 2004 Nov 24 (?) | 2004 Dec 25 (?) | Explosive / Effusive | 2 |
| Reventador | Ecuador | 2004 Nov 7 ± 3 days | 2006 Mar 16 ± 15 days | Explosive / Effusive | 2 |
| Telica | Nicaragua | 2004 Nov 5 | 2005 Jan 29 | Explosive / Effusive | 1 |
| Grimsvotn | Iceland | 2004 Nov 1 | 2004 Nov 4 | Explosive / Effusive | 3 |
| Manam | Papua New Guinea | 2004 Oct 24 | 2009 Dec 12 (?) | Explosive / Effusive | 4 |
| Suwanosejima | Japan | 2004 Oct 23 | 2025 Sep 19 (continuing) | Explosive / Effusive | 2 |
| Soputan | Indonesia | 2004 Oct 18 | 2004 Dec 27 (?) | Explosive / Effusive | 3 |
| St. Helens | United States | 2004 Oct 1 | 2008 Jan 27 ± 10 days | Explosive / Effusive | 2 |
| Rinjani | Indonesia | 2004 Oct 1 | 2004 Oct 5 (on or after) | Explosive / Effusive | 2 |
| Lopevi | Vanuatu | 2004 Sep 16 ± 15 days | 2004 Sep 16 ± 15 days | Explosive / Effusive | 2 |
| Klyuchevskoy | Russia | 2004 Sep 15 | 2004 Sep 15 | Explosive / Effusive | 1 |
| Etna | Italy | 2004 Sep 7 | 2005 Mar 8 | Explosive / Effusive | 1 |
| Asamayama | Japan | 2004 Sep 1 | 2004 Dec 9 | Explosive / Effusive | 2 |
| Villarrica | Chile | 2004 Aug 5 (?) | 2007 Dec 24 (?) | Explosive / Effusive | 1 |
| Marapi | Indonesia | 2004 Aug 5 | 2004 Aug 5 (?) | Explosive / Effusive | 2 |
| Nightingale Island | United Kingdom | 2004 Jul 29 | 2004 Jul 30 | Explosive / Effusive | 0 |
| Chirinkotan | Russia | 2004 Jul 20 | 2004 Jul 20 | Explosive / Effusive | 2 |
| Pacaya | Guatemala | 2004 Jul 19 (?) | 2005 Sep 11 | Explosive / Effusive | 3 |
| Galeras | Colombia | 2004 Jul 16 | 2005 Feb 7 (?) | Explosive / Effusive | 3 |
| Egon | Indonesia | 2004 Jul 3 | 2004 Sep 16 (?) | Explosive / Effusive | 2 |
| Marion Island | South Africa | 2004 Jun 24 | 2004 Jun 24 (?) | Explosive / Effusive | 1 |
| Atka Volcanic Complex | United States | 2004 Jun 23 ± 10 days | 2004 Jul 4 (on or before) | Phreatic | 1 |
| Kerinci | Indonesia | 2004 Jun 22 (?) | 2004 Oct 24 (?) | Explosive / Effusive | 2 |
| Tengger Caldera | Indonesia | 2004 Jun 8 | 2004 Jun 24 ± 3 days | Explosive / Effusive | 2 |
| Mayon | Philippines | 2004 Jun 3 | 2004 Sep 12 (?) | Explosive / Effusive | 1 |
| Awu | Indonesia | 2004 Jun 2 (on or before) | 2004 Aug 16 (?) ± 15 days | Explosive / Effusive | 2 |
| Popocatepetl | Mexico | 2004 May 26 | 2004 May 26 | Explosive / Effusive | 2 |
| Ibu | Indonesia | 2004 May 16 (?) ± 15 days | 2005 Feb 22 (?) | Explosive / Effusive | 0 |
| Nyamulagira | DR Congo | 2004 May 8 | 2004 May 28 ± 3 days | Explosive / Effusive | 2 |
| Piton de la Fournaise | France | 2004 May 2 | 2004 Oct 14 | Explosive / Effusive | 1 |
| Ulawun | Papua New Guinea | 2004 Apr 12 | 2004 Apr 14 | Explosive / Effusive | 2 |
| Anatahan | United States | 2004 Apr 12 (on or before) | 2005 Sep 3 (?) | Explosive / Effusive | 3 |
| Karangetang | Indonesia | 2004 Apr 2 (?) | 2005 Aug 5 (?) | Explosive / Effusive | 2 |
| Telica | Nicaragua | 2004 Mar 31 | 2004 Mar 31 | Explosive / Effusive | 1 |
| Tofua | Tonga | 2004 Mar 19 | 2014 Oct 18 | Explosive / Effusive | 1 |
| Kavachi | Solomon Islands | 2004 Mar 15 | Unknown | 1 | |
| Kikai | Japan | 2004 Mar 5 | 2004 Oct 16 ± 15 days | Explosive / Effusive | 2 |
| Soufriere Hills | United Kingdom | 2004 Mar 3 | 2004 May 2 | Explosive / Effusive | 3 |
| Tokachidake | Japan | 2004 Feb 25 | 2004 Apr 19 | Explosive / Effusive | 1 |
| Shishaldin | United States | 2004 Feb 17 | 2004 Jul 16 (on or after) ± 15 days | Explosive / Effusive | 2 |
| East Epi | Vanuatu | 2004 Feb 16 | 2004 Feb 24 | Submarine | 2 |
| Veniaminof | United States | 2004 Feb 16 | 2004 Sep 5 ± 4 days | Explosive / Effusive | 2 |
| Etna | Italy | 2004 Feb 12 | 2004 Feb 14 | Explosive / Effusive | 1 |
| Egon | Indonesia | 2004 Jan 29 | 2004 Feb 5 (?) | Explosive / Effusive | 1 |
| Langila | Papua New Guinea | 2004 Jan 20 (?) | 2004 Jan 27 (?) | Explosive / Effusive | 2 |
| Bezymianny | Russia | 2004 Jan 14 | 2005 Feb 16 (?) ± 15 days | Explosive / Effusive | 3 |
| Asosan | Japan | 2004 Jan 14 | 2004 Jan 14 | Explosive / Effusive | 1 |
| Manam | Papua New Guinea | 2003 Oct 26 ± 5 days | 2004 Mar 28 | Explosive / Effusive | 1 |
| NW Rota-1 | United States | 2003 Jul 2 (?) ± 182 days | 2010 Mar 16 (on or after) ± 15 days | Explosive / Effusive | 0 |
| San Cristobal | Nicaragua | 2003 Jun 17 | 2004 Jun 13 | Explosive / Effusive | 1 |
| Heard | Australia | 2003 Jun 9 | 2004 Jun 14 | Explosive / Effusive | 0 |
| Piton de la Fournaise | France | 2003 May 30 | 2004 Jan 10 | Explosive / Effusive | 0 |
| Villarrica | Chile | 2003 May 23 (?) | 2004 Mar 25 (?) | Explosive / Effusive | 1 |
| Monowai | New Zealand | 2003 Apr 10 | 2004 Sep 16 ± 15 days | Explosive / Effusive | 0 |
| Klyuchevskoy | Russia | 2002 Nov 24 | 2004 Apr 8 | Explosive / Effusive | 2 |
| Rabaul | Papua New Guinea | 2002 Oct 6 (?) | 2004 Feb 17 | Explosive / Effusive | 2 |
| Nyiragongo | DR Congo | 2002 May 17 (?) | 2025 Sep 19 (continuing) | Lava Lake | 2 |
| Fuego | Guatemala | 2002 Jan 4 | 2025 Sep 19 (continuing) | Explosive / Effusive | 3 |
| Karymsky | Russia | 2001 Nov 15 | 2016 Apr 1 | Explosive / Effusive | 3 |
| Montagu Island | United Kingdom | 2001 Oct 1 ± 20 days | 2007 Sep 20 | Explosive / Effusive | 1 |
| Suwanosejima | Japan | 2000 Dec 19 | 2004 Jul 5 (?) | Explosive / Effusive | 3 |
| Saunders | United Kingdom | 2000 May 13 | 2013 Nov 16 | Explosive / Effusive | 0 |
| Bagana | Papua New Guinea | 2000 Feb 28 (in or before) | 2025 Sep 19 (continuing) | Explosive / Effusive | 2 |
| Tungurahua | Ecuador | 1999 Oct 5 | 2009 Jul 8 ± 7 days | Explosive / Effusive | 3 |
| Sheveluch | Russia | 1999 Aug 15 | 2025 Sep 19 (continuing) | Explosive / Effusive | 4 |
| Colima | Mexico | 1997 Nov 22 | 2011 Jun 21 | Explosive / Effusive | 3 |
| Ambrym | Vanuatu | 1996 Jun 16 (on or before) ± 15 days | 2005 Aug 16 (on or after) ± 15 days | Explosive / Effusive | 1 |
| Ol Doinyo Lengai | Tanzania | 1994 Sep 18 | 2006 Jul 16 (?) ± 15 days | Explosive / Effusive | 1 |
| Kilauea | United States | 1983 Jan 3 | 2018 Sep 5 | Explosive / Effusive | 3 |
| Erebus | Antarctica | 1972 Dec 16 (on or before) ± 15 days | 2025 Sep 19 (continuing) | Lava Lake | 2 |
| Arenal | Costa Rica | 1968 Jul 29 | 2010 Dec 16 (?) ± 15 days | Explosive / Effusive | 3 |
| Semeru | Indonesia | 1967 Aug 31 | 2009 Mar 15 | Explosive / Effusive | 3 |
| Erta Ale | Ethiopia | 1967 Jul 2 (in or before) ± 182 days | 2025 Sep 19 (continuing) | Explosive / Effusive | 0 |
| Aira | Japan | 1955 Oct 13 | 2016 Aug 22 | Explosive / Effusive | 3 |
| Sangay | Ecuador | 1934 Aug 8 | 2011 Mar 2 | Explosive / Effusive | 3 |
| Stromboli | Italy | 1934 Feb 2 | 2025 Sep 19 (continuing) | Explosive / Effusive | 2 |
| Dukono | Indonesia | 1933 Aug 13 | 2025 Sep 19 (continuing) | Explosive / Effusive | 3 |
| Santa Maria | Guatemala | 1922 Jun 22 | 2025 Sep 19 (continuing) | Explosive / Effusive | 3 |
| Yasur | Vanuatu | 1270 ± 110 years | 2025 Sep 19 (continuing) | Explosive / Effusive | 3 |
List of Questions
Global Volcanism Program, 2025. [Database] Volcanoes of the World (v. 5.3.3; 26 Nov 2025). Distributed by Smithsonian Institution, compiled by Venzke, E. https://doi.org/10.5479/si.GVP.VOTW5-2025.5.3
