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 |
|---|---|---|---|
| 30 January 1995 | 30 January 1995 | 1 | Observations: Reported |
| 16 August 1993 | 19 January 1994 | 1 | Observations: Reported |
| 2 March 1987 | 2 March 1987 | 1 | Observations: Reported |
| 1 May 1980 | 4 July 1980 | 1 | SE side of summit · Observations: Reported |
| 20 December 1951 | — | 1 | Observations: Reported |
| 16 October 1938 | — | 2 | Observations: Reported |
| 30 December 1926 | — | 2 | Observations: Reported |
| 2 July 1907 | — | ? | Observations: Reported |
| 2 July 1883 | — | 2 | Observations: Reported |
| 2 July 1865 | — | ? | Observations: Reported |
| 16 June 1826 | — | 3 | Observations: Reported |
| 2 July 1802 | — | 3 | Observations: Reported |
| 1768 | 1769 | 3 | Observations: Reported |
| 1150 ± 500 years | — | ? | Correlation: Tephrochronology |
| 550 BCE ± 900 years | — | ? | Correlation: Tephrochronology |
| c. 1,750 BCE | — | ? | Isotopic: 14C (uncalibrated) |
| 3,650 BCE ± 1,850 years | — | 4 | Correlation: Tephrochronology |
| 6,100 BCE ± 50 years | — | 5 | Isotopic: 14C (uncalibrated) |
| 6,650 BCE ± 200 years | — | ? | Isotopic: 14C (uncalibrated) |
Data: Global Volcanism Program, Smithsonian Institution (#311310)