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 November 1991 | 14 January 1992 | 3 | ENE flank (1560-760 m) · Observations: Reported |
| 4 February 1978 | 9 February 1978 | 3 | South of Westdahl Peak (1450 m) · Observations: Reported |
| 10 March 1964 | 16 April 1964 | 2 | Observations: Reported |
| 2 July 1827 | 2 July 1830 | 2 | Pogromni or (more likely) Westdahl · Observations: Reported |
| 2 July 1820 | — | 2 | Pogromni or (more likely) Westdahl · Observations: Reported |
| 1796 | — | 0 | Pogromni or (more likely) Westdahl · Observations: Reported |
| 1795 | — | 4 | Pogromni or (more likely) Westdahl · Observations: Reported |
Data: Global Volcanism Program, Smithsonian Institution (#311340)