Eruption history
VEI – Volcanic Explosivity Index: 0 = lava outpouring, 4 = like Eyjafjallajökull 2010, 6 = like Pinatubo 1991, 7 = like Tambora 1815. The scale is logarithmic – each step is about 10 times more material.
| Start | End | VEI | Vent and dating |
|---|---|---|---|
| 8 December 2018 | 31 December 2024 | 2 | Summit vent and NW flank · Observations: Reported |
| 21 October 2017 | 26 October 2017 | 3 | Summit crater · Observations: Reported |
| 19 September 2008 | 29 November 2008 | 1 | Observations: Reported |
| 11 February 2006 | 9 November 2007 | 2 | Observations: Reported |
| 29 February 2000 | 8 May 2001 | 1 | Observations: Reported |
| 16 May 1999 | — | 1 | Observations: Reported |
| 2 July 1995 | — | 1 | Observations: Reported |
| 16 August 1989 | 16 February 1990 | 1 | Observations: Reported |
| 3 June 1984 | 13 June 1985 | 2 | Upper NW flank · Observations: Reported |
| 6 September 1971 | 11 December 1971 | 2 | Upper and lower NW flanks · Observations: Reported |
| 23 November 1965 | 11 June 1966 | 3 | Upper NW flank · Observations: Reported |
| 23 October 1951 | 27 November 1951 | 3 | Observations: Reported |
| 11 May 1932 | — | 1 | Observations: Reported |
| 1 March 1927 | 4 March 1927 | 2 | Observations: Reported |
| 16 August 1909 | — | 2 | Observations: Reported |
| 26 March 1897 | — | 2 | Observations: Reported |
| 2 July 1886 | — | ? | Observations: Reported |
| 16 September 1871 | 19 September 1871 | 2 | Observations: Reported |
| 16 March 1869 | — | 2 | Observations: Reported |
| 16 August 1855 | 16 August 1857 | 2 | Observations: Reported |
| c. 2 July 1840 | — | 3 | Observations: Reported |
| 1797 | — | 1 | Observations: Reported |
| 17 August 1767 | — | 2 | Observations: Reported |
| c. 7 September 1595 | 14 September 1595 | 3 | Observations: Reported |
| c. 1,050 BCE | — | ? | Isotopic: 14C (uncalibrated) |
Data: Global Volcanism Program, Smithsonian Institution (#256010)