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What was erupting in the year...?

There were 66 confirmed eruptions at some point during 1984 from 59 different volcanoes; 35 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 (17 March 2022). 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
Ulawun Papua New Guinea 1984 Dec 30 1985 Jan 27 1
Nevado del Ruiz Colombia 1984 Dec 22 1985 Mar 19 (?) 1
Lascar Chile 1984 Dec 16 ± 15 days 1985 Jul 16 ± 15 days 0
Concepcion Nicaragua 1984 Dec 16 ± 15 days 1985 Jan 2 2
Veniaminof United States 1984 Nov 29 1984 Dec 6 (?) 2
Marapi Indonesia 1984 Nov 15 1984 Nov 15 1
Ruapehu New Zealand 1984 Oct 25 (?) 1984 Dec 16 ± 15 days 1
Suwanosejima Japan 1984 Oct 16 ± 15 days 1984 Oct 16 ± 15 days 2
Mayon Philippines 1984 Sep 9 1984 Oct 6 3
Krafla Iceland 1984 Sep 4 1984 Sep 18 0
Ulawun Papua New Guinea 1984 Aug 23 1984 Sep 11 1
Villarrica Chile 1984 Aug 11 1985 Nov 18 2
Gorely Russia 1984 Aug 4 1986 Sep 21 (?) 2
Etna Italy 1984 Jul 20 1986 Sep 24 3
Cleveland United States 1984 Jul 12 1984 Jul 12 1
Ambrym Vanuatu 1984 Jul 2 ± 182 days 1986 Mar 8 (in or after) 2
Tinakula Solomon Islands 1984 Jun 3 (in or before) 1985 Jun 13 (in or after) 2
Soputan Indonesia 1984 May 24 1984 Aug 31 3
Tengger Caldera Indonesia 1984 May 12 1984 May 31 1
Paluweh Indonesia 1984 May 9 1984 May 21 2
Akan Japan 1984 May 1 1984 May 1 1
Etna Italy 1984 Apr 28 1984 Oct 18 1
Llaima Chile 1984 Apr 20 1984 Nov 26 2
Asosan Japan 1984 Apr 13 ± 3 days 1985 Jun 24 1
Ruapehu New Zealand 1984 Apr 2 Unknown 1
Rincon de la Vieja Costa Rica 1984 Mar 31 1984 Apr 16 ± 15 days 2
Fernandina Ecuador 1984 Mar 30 Unknown 1
Mauna Loa United States 1984 Mar 25 1984 Apr 15 0
Sheveluch Russia 1984 Mar 17 1984 Sep 6 2
Klyuchevskoy Russia 1984 Mar 10 1985 Jan 28 3
Kaitoku Seamount Japan 1984 Mar 8 1984 Mar 26 (?) 0
Home Reef Tonga 1984 Mar 1 1984 Mar 5 3
Nyamulagira DR Congo 1984 Feb 23 1984 Mar 14 2
Bezymianny Russia 1984 Feb 5 1984 Dec 16 ± 15 days 3
Galunggung Indonesia 1984 Jan 9 1984 Jan 31 (?) 1
Whakaari/White Island New Zealand 1983 Dec 26 ± 5 days 1984 Feb 12 ± 5 days 2
Teahitia France 1983 Dec 18 1984 Jul 14 0
Piton de la Fournaise France 1983 Dec 4 1984 Feb 18 2
Ulawun Papua New Guinea 1983 Nov 6 1984 Mar 13 1
Macdonald Undersea Features 1983 Oct 27 1984 Jan 3 0
Veniaminof United States 1983 Jun 2 1984 Apr 17 3
Karangetang Indonesia 1983 May 16 ± 15 days 1988 Dec 31 (in or after) 3
Iliboleng Indonesia 1983 May 11 1984 Apr 13 2
Kilauea United States 1983 Jan 3 2018 Sep 5 3
Ol Doinyo Lengai Tanzania 1983 Jan 1 1993 Sep 24 2
Pagan United States 1981 May 15 1985 May 1 (in or after) 4
St. Helens United States 1980 Mar 27 1986 Oct 28 ± 3 days 5
Etna Italy 1979 Jul 3 1992 Dec 16 ± 15 days 2
Manam Papua New Guinea 1974 Mar 4 (?) 1999 Nov 9 (?) 3
Nevados de Chillan Chile 1973 Jul 16 ± 15 days 1986 Jul 2 ± 182 days 2
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 2022 Mar 17 (continuing) 2
Merapi Indonesia 1972 Oct 6 1985 Mar 16 ± 15 days 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 2022 Mar 17 (continuing) 0
Masaya Nicaragua 1965 Oct 10 (?) 1985 Apr 16 (?) ± 15 days 1
Pacaya Guatemala 1965 Jul 4 1989 Mar 10 3
Suwanosejima Japan 1956 Nov 16 ± 15 days 1984 May 16 ± 15 days 2
Aira Japan 1955 Oct 13 2016 Aug 22 3
Sangay Ecuador 1934 Aug 8 2011 Mar 2 3
Stromboli Italy 1934 Feb 2 2022 Mar 17 (continuing) 2
Dukono Indonesia 1933 Aug 13 2022 Mar 17 (continuing) 3
Santa Maria Guatemala 1922 Jun 22 2022 Mar 17 (continuing) 3
Yasur Vanuatu 1774 Jul 2 (in or before) ± 182 days 2022 Mar 17 (continuing) 3

List of Questions

Global Volcanism Program, 2013. Volcanoes of the World, v. 4.10.6 (24 Mar 2022). Venzke, E (ed.). Smithsonian Institution. Downloaded 25 May 2022. https://doi.org/10.5479/si.GVP.VOTW4-2013.