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What was erupting in the year...?

There were 69 confirmed eruptions at some point during 1991 from 65 different volcanoes; 38 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 (24 June 2021). Information about more recent eruptions can be found in the Smithsonian / USGS Weekly Volcanic Activity Report.

Volcano Country Eruption Start Date Eruption Stop Date Max VEI
Etna Italy 1991 Dec 14 1993 Mar 30 2
Northern EPR at 9.8°N Undersea Features 1991 Dec 1 ± 30 days 1992 Feb 4 ± 30 days 0
Kirishimayama Japan 1991 Dec 1 1992 Apr 19 1
Westdahl United States 1991 Nov 29 1992 Jan 14 3
Iliboleng Indonesia 1991 Nov 3 1991 Nov 15 1
Lascar Chile 1991 Oct 21 1992 May 23 (?) 2
Marchena Ecuador 1991 Sep 25 1991 Nov 16 (?) ± 15 days 2
Nyamulagira DR Congo 1991 Sep 20 1993 Feb 8 3
Akutan United States 1991 Sep 15 1991 Oct 29 ± 1 days 2
Raung Indonesia 1991 Sep 10 1991 Nov 12 (?) 2
Villarrica Chile 1991 Aug 30 1991 Sep 17 2
Cerro Hudson Chile 1991 Aug 8 1991 Oct 27 5
Piton de la Fournaise France 1991 Jul 19 1991 Jul 20 0
Karthala Comoros 1991 Jul 11 1991 Jul 11 2
Ruapehu New Zealand 1991 Jul 5 (?) 1991 Jul 14 (?) 1
Peuet Sague Indonesia 1991 Jul 2 ± 182 days Unknown 2
Karangetang Indonesia 1991 Jul 2 (in or before) 1993 Dec 31 (in or after) 2
Lateiki Tonga 1991 Jun 24 (in or before) Unknown 0
Soputan Indonesia 1991 May 22 1996 Sep 29 (in or after) 2
Lokon-Empung Indonesia 1991 May 17 1992 Jan 16 ± 15 days 3
Ontakesan Japan 1991 May 13 1991 May 16 0
Lewotobi Indonesia 1991 May 11 1992 Dec 31 (in or after) 1
Iliboleng Indonesia 1991 May 8 1991 Jun 30 (in or after) 1
Rincon de la Vieja Costa Rica 1991 May 7 1992 Sep 16 ± 15 days 2
Kavachi Solomon Islands 1991 May 4 (in or before) 1991 Sep 16 ± 15 days 2
Fernandina Ecuador 1991 Apr 19 1991 Apr 24 2
Klyuchevskoy Russia 1991 Apr 8 1991 Jun 24 (?) 2
Pinatubo Philippines 1991 Apr 2 1991 Sep 2 6
Barren Island India 1991 Apr 1 1991 Oct 31 ± 7 days 2
Ranakah Indonesia 1991 Mar 16 (in or before) ± 15 days Unknown 1
Northern EPR at 9.8°N Undersea Features 1991 Mar 16 (?) ± 15 days Unknown 0
Poas Costa Rica 1991 Mar 6 1991 Sep 16 ± 15 days 1
Colima Mexico 1991 Mar 1 1991 Oct 16 ± 15 days 2
Kanlaon Philippines 1991 Feb 14 1991 Feb 14 2
Planchon-Peteroa Chile 1991 Feb 9 1991 Mar 2 ± 2 days 2
Hekla Iceland 1991 Jan 17 1991 Mar 11 3
Ebeko Russia 1991 Jan 16 ± 15 days 1991 Jan 16 ± 15 days 1
Avachinsky Russia 1991 Jan 13 1991 Jan 30 2
Unzendake Japan 1990 Nov 17 1995 Feb 16 ± 15 days 1
St. Helens United States 1990 Nov 5 1991 Feb 14 3
Ambrym Vanuatu 1990 Sep 16 (in or before) ± 15 days 1991 Jul 16 (in or after) ± 15 days 2
Monowai New Zealand 1990 May 30 1991 Mar 25 0
Sabancaya Peru 1990 May 28 1998 Sep 16 (?) ± 15 days 3
Suwanosejima Japan 1990 Apr 16 ± 15 days 1996 Jul 14 2
Bezymianny Russia 1990 Jan 29 1991 Nov 29 3
Sheveluch Russia 1990 Jan 10 1995 Feb 16 ± 15 days 3
Galeras Colombia 1990 Jan 7 1992 Jul 16 2
Pacaya Guatemala 1990 Jan 4 (?) 2000 Mar 1 3
Etna Italy 1989 Dec 16 1992 May 23 3
Asosan Japan 1989 Apr 5 1991 Feb 9 2
Marapi Indonesia 1987 Jan 15 1994 Aug 12 (in or after) 2
Whakaari/White Island New Zealand 1986 Feb 1 (?) 1994 Jul 28 3
Nevado del Ruiz Colombia 1985 Sep 11 1991 Jul 13 3
Kilauea United States 1983 Jan 3 2018 Sep 5 3
Ol Doinyo Lengai Tanzania 1983 Jan 1 1993 Sep 24 2
Etna Italy 1979 Jul 3 1992 Dec 16 ± 15 days 2
Manam Papua New Guinea 1974 Mar 4 (?) 1999 Nov 9 (?) 3
Langila Papua New Guinea 1973 Feb 24 ± 4 days 2000 Oct 16 (in or after) ± 15 days 3
Erebus Antarctica 1972 Dec 16 (in or before) ± 15 days 2021 Jun 24 (continuing) 2
Bagana Papua New Guinea 1972 Jul 2 ± 182 days 1995 Jul 2 (in or after) ± 182 days 2
Arenal Costa Rica 1968 Jul 29 2010 Dec 16 (?) ± 15 days 3
Semeru Indonesia 1967 Aug 31 2009 Mar 15 3
Erta Ale Ethiopia 1967 Jul 2 (in or before) ± 182 days 2020 Dec 4 0
Aira Japan 1955 Oct 13 2016 Aug 22 3
Sangay Ecuador 1934 Aug 8 2011 Mar 2 3
Stromboli Italy 1934 Feb 2 2021 Jun 24 (continuing) 2
Dukono Indonesia 1933 Aug 13 2021 Jun 24 (continuing) 3
Santa Maria Guatemala 1922 Jun 22 2021 Jun 24 (continuing) 3
Yasur Vanuatu 1774 Jul 2 (in or before) ± 182 days 2021 Jun 24 (continuing) 3

List of Questions

Global Volcanism Program, 2013. Volcanoes of the World, v. 4.10.1 (29 Jun 2021). Venzke, E (ed.). Smithsonian Institution. Downloaded 27 Jul 2021. https://doi.org/10.5479/si.GVP.VOTW4-2013.