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 |
|---|---|---|---|
| 29 October 1971 | 9 November 1971 | 2 | Observations: Reported |
| 22 September 1906 | 20 December 1906 | 2 | Summit crater K5 · Observations: Reported |
| 17 October 1903 | 21 October 1903 | 2 | Upper NE and SW flanks (2850-2980 m) · Observations: Reported |
| 1 May 1902 | 25 May 1902 | 1 | Observations: Reported |
| 13 November 1887 | 14 November 1887 | 2 | Observations: Reported |
| 16 August 1883 | — | 2 | Observations: Reported |
| 1 April 1882 | 7 April 1882 | 2 | Summit, NW and NE flanks · Observations: Reported |
| 2 July 1818 | — | 2 | Observations: Reported |
| c. 2 July 1806 | — | 2 | Observations: Reported |
| c. 470 | — | ? | Isotopic: 14C (uncalibrated) |
| c. 230 | — | ? | Isotopic: 14C (uncalibrated) |
Data: Global Volcanism Program, Smithsonian Institution (#263210)