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 |
|---|---|---|---|
| 4 September 2000 | 8 November 2000 | 1 | Observations: Reported |
| 25 October 1998 | 25 October 1998 | 2 | 1996 crater · Observations: Reported |
| 5 March 1996 | 12 March 1996 | 1 | 1929 crater and summit crater fissure · Observations: Reported |
| 16 November 1942 | 18 November 1942 | 3 | NW-SE 1.6-km fissure · Observations: Reported |
| 17 March 1937 | 19 March 1937 | 1 | Observations: Reported |
| 17 June 1929 | 6 September 1929 | 4 | SE and NE of Ansei Crater · Observations: Reported |
| 28 March 1928 | — | 1 | Observations: Reported |
| 31 July 1924 | — | 2 | Observations: Reported |
| 27 February 1923 | 15 March 1923 | 2 | Observations: Reported |
| 22 May 1922 | — | 2 | Observations: Reported |
| 17 June 1919 | 26 July 1919 | 2 | SE of Ansei Crater · Observations: Reported |
| 19 August 1905 | 1 September 1905 | 2 | South of Ansei Crater · Observations: Reported |
| 14 April 1888 | — | 2 | NW side of 1856 (Ansei) crater · Observations: Reported |
| 25 September 1856 | — | 4 | Ansei Crater · Observations: Reported |
| 4 July 1694 | 6 July 1694 | 4 | Observations: Reported |
| 31 July 1640 | 9 October 1640 | 5 | Observations: Reported |
| c. 4,350 BCE | — | 4 | Isotopic: 14C (calibrated) |
| 4,500 BCE ± 150 years | — | ? | Correlation: Tephrochronology |
| 4,600 BCE ± 50 years | — | 5 | Isotopic: 14C (calibrated) |
Data: Global Volcanism Program, Smithsonian Institution (#285020)