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What volcanoes have had the longest eruptions?
There have been 101 confirmed eruptions with start dates in 1750 or later that have lasted at least 60 months (5 years or more), from 57 different volcanoes. Continuing eruptions account for 26. The number of Eruption Months is a count of the number of different months from the Start Date to the Stop Date, not taking any uncertainty into account. Eruption Years is the number of full years in eruption calculated from the month total. This does not consider any eruptive pauses shorter than three months; for consistency in the Volcanoes of the World database, renewed eruptions after inactivity lasting more than three months results in the designation of a new eruption. Eruptions are listed below sorted with the longest at the top.
VolcanoCountryEruption MonthsEruption YearsEruption Start DateEruption Stop DateMax VEI
YasurVanuatu29652471774 Jul 2 (in or before) ± 182 days2021 Aug 19 (continuing)3
Santa MariaGuatemala1190991922 Jun 222021 Aug 19 (continuing)3
DukonoIndonesia1056881933 Aug 132021 Aug 21 (continuing)3
StromboliItaly1050881934 Feb 22021 Aug 19 (continuing)2
SangayEcuador919771934 Aug 82011 Mar 23
AiraJapan730611955 Oct 132016 Aug 223
Erta AleEthiopia649541967 Jul 2 (in or before) ± 182 days2021 Aug 1 (continuing)0
NyiragongoDR Congo598501927 Mar 16 ± 15 days1977 Jan 101
ErebusAntarctica584491972 Dec 16 (in or before) ± 15 days2021 Aug 19 (continuing)2
ArenalCosta Rica509421968 Jul 292010 Dec 16 (?) ± 15 days3
SemeruIndonesia499421967 Aug 312009 Mar 153
KilaueaUnited States428361983 Jan 32018 Sep 53
VesuviusItaly369311913 Jul 51944 Apr 43
VesuviusItaly364301875 Dec 181906 Apr 224
LangilaPapua New Guinea332281973 Feb 24 ± 4 days2000 Oct 16 (in or after) ± 15 days3
SuwanosejimaJapan330281956 Nov 16 ± 15 days1984 May 16 ± 15 days2
ManamPapua New Guinea308261974 Mar 4 (?)1999 Nov 9 (?)3
PacayaGuatemala284241965 Jul 41989 Mar 103
BaganaPapua New Guinea276231972 Jul 2 ± 182 days1995 Jul 2 (in or after) ± 182 days2
SheveluchRussia264221999 Aug 152021 Aug 19 (continuing)4
BaganaPapua New Guinea258222000 Feb 28 (in or before)2021 Aug 19 (continuing)2
FuegoGuatemala235202002 Jan 42021 Aug 19 (continuing)3
MasayaNicaragua234201965 Oct 10 (?)1985 Apr 16 (?) ± 15 days1
NyiragongoDR Congo231192002 May 17 (?)2021 Aug 19 (continuing)2
SuwanosejimaJapan202172004 Oct 232021 Aug 19 (continuing)2
PopocatepetlMexico199172005 Jan 92021 Aug 19 (continuing)2
SemeruIndonesia173141950 Jul 231964 Dec 16 ± 15 days2
KarymskyRussia173142001 Nov 152016 Apr 13
ColimaMexico163141997 Nov 222011 Jun 213
SaundersUnited Kingdom162142000 May 132013 Nov 160
EtnaItaly161131979 Jul 31992 Dec 16 ± 15 days2
IbuIndonesia160132008 Apr 52021 Aug 19 (continuing)1
ReventadorEcuador157132008 Jul 272021 Aug 19 (continuing)2
Nevados de ChillanChile156131973 Jul 16 ± 15 days1986 Jul 2 ± 182 days2
MerapiIndonesia149121972 Oct 61985 Mar 16 ± 15 days2
KarymskyRussia149121970 May 111982 Oct 113
Ol Doinyo LengaiTanzania142121994 Sep 182006 Jul 16 (?) ± 15 days1
BezymiannyRussia135112010 May 21 (?)2021 Aug 19 (continuing)3
VesuviusItaly131111783 Aug 181794 Jul 53
MerapiIndonesia129111992 Jan 202002 Oct 19 (?)2
Ol Doinyo LengaiTanzania128111983 Jan 11993 Sep 242
TofuaTonga127112004 Mar 192014 Oct 181
AmbrymVanuatu127112008 May 232018 Dec 172
VesuviusItaly122101824 Jul 21834 Sep 23
PacayaGuatemala122101990 Jan 4 (?)2000 Mar 13
TungurahuaEcuador117101999 Oct 52009 Jul 8 ± 7 days3
TungurahuaEcuador117101916 Mar 31925 Dec 1 ± 30 days4
VesuviusItaly116101770 Feb 151779 Oct 4 (?)3
AmbrymVanuatu11091996 Jun 16 (in or before) ± 15 days2005 Aug 16 (in or after) ± 15 days1
IzalcoEl Salvador10991948 Nov 41957 Dec 1 ± 30 days3
Michoacan-GuanajuatoMexico10891943 Feb 201952 Feb 254
PoasCosta Rica10891898 Dec 291907 Dec 31 ± 365 days1
GalerasColombia10891974 Jul 2 ± 182 days1983 Jul 2 (?) ± 182 days1
Batu TaraIndonesia10692007 Jan 17 (?)2015 Nov 262
Whakaari/White IslandNew Zealand10181986 Feb 1 (?)1994 Jul 283
VesuviusItaly10181841 Sep 201850 Feb 162
HeardAustralia10082012 Sep 5 ± 4 days2021 Jan 200
SabancayaPeru10081990 May 281998 Sep 16 (?) ± 15 days3
Soufriere HillsUnited Kingdom9981995 Jul 182003 Oct 83
LascarChile9881959 Nov 16 ± 15 days1968 Jan 31 (in or after)2
EtnaItaly9582013 Sep 32021 Aug 19 (continuing)2
Soufriere HillsUnited Kingdom9482005 Apr 152013 Feb 53
PopocatepetlMexico9281996 Mar 52003 Nov 22 (?)3
MarapiIndonesia9181987 Jan 151994 Aug 12 (in or after)2
EtnaItaly9081971 Sep 191979 Mar 16 (?) ± 15 days2
SemeruIndonesia8872014 Apr 1 ± 15 days2021 Aug 19 (continuing)3
ManamPapua New Guinea8672014 Jun 292021 Aug 19 (continuing)2
EtnaItaly8571994 Jun 172001 Jul 173
ColimaMexico8471963 Jul 2 ± 182 days1970 Jul 2 ± 182 days1
Nevado del RuizColombia8172014 Nov 182021 Aug 19 (continuing)2
NW Rota-1United States8072003 Jul 2 (?) ± 182 days2010 Mar 16 (in or after) ± 15 days0
Ol Doinyo LengaiTanzania8071960 Mar 16 (in or before) ± 15 days1966 Nov 28 ± 30 days3
VillarricaChile8072014 Dec 2 ± 7 days2021 Aug 13 (continuing)1
St. HelensUnited States7971980 Mar 271986 Oct 28 ± 3 days5
SaundersUnited Kingdom7872014 Nov 122021 May 12 (continuing)1
SuwanosejimaJapan7561990 Apr 16 ± 15 days1996 Jul 142
PacayaGuatemala7462015 Jun 7 ± 1 days2021 Aug 19 (continuing)1
VesuviusItaly7261855 Dec 191861 Dec 313
Montagu IslandUnited Kingdom7162001 Oct 1 ± 20 days2007 Sep 201
MasayaNicaragua7062015 Oct 32021 Aug 16 (continuing)1
TofuaTonga7062015 Oct 22021 Aug 15 (continuing)0
Nevado del RuizColombia7061985 Sep 111991 Jul 133
LangilaPapua New Guinea7062015 Oct 22 (?)2021 Aug 19 (continuing)2
MerapiIndonesia6961953 Mar 21958 Dec 16 ± 15 days2
RabaulPapua New Guinea7061995 Nov 282001 Sep 5 ± 4 days2
PoasCosta Rica6961952 Mar 231957 Dec 252
KarangetangIndonesia6761983 May 16 ± 15 days1988 Dec 31 (in or after)3
Nevados de ChillanChile6762016 Jan 82021 Aug 19 (continuing)2
EtnaItaly6661935 Jul 71941 Jan 27 (?)3
LamingtonPapua New Guinea6661951 Jan 171956 Jul 2 ± 182 days4
SheveluchRussia6551944 Nov 51950 Apr 62
AsamayamaJapan6551909 Jan 291914 Jun 241
SoputanIndonesia6451991 May 221996 Sep 29 (in or after)2
EtnaItaly6251959 Oct 171964 Dec 313
EtnaItaly6251966 Jan 101971 Mar 16 (?) ± 15 days2
KilaueaUnited States6251969 May 241974 Jul 220
ManamPapua New Guinea6252004 Oct 242009 Dec 12 (?)4
Whakaari/White IslandNew Zealand6151976 Dec 181982 Jan 293
SheveluchRussia6151990 Jan 101995 Feb 16 ± 15 days3
BezymiannyRussia6051965 Mar 91970 Mar 16 ± 15 days3
Southern EPR at 8°SUndersea Features6051964 Jul 2 (?) ± 182 days1969 Jul 2 (?) ± 182 days0

List of Questions
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Global Volcanism Program, 2013. Volcanoes of the World, v. 4.10.2 (24 Aug 2021). Venzke, E (ed.). Smithsonian Institution. Downloaded 18 Sep 2021. https://doi.org/10.5479/si.GVP.VOTW4-2013​.

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