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 |
|---|---|---|---|
| 27 July 1780 | May 1785 | 3 | Maru-yama, SW part of Ikenosawa crater · Observations: Reported |
| 1670 | 1680 | 2 | Ikenosawa crater · Observations: Reported |
| 1652 | — | 3 | Ikenosawa crater · Observations: Reported |
| 600 BCE ± 200 years | — | 4 | SE flank (Kintagaura) · Isotopic: 14C (uncalibrated) |
| 1,100 BCE ± 300 years | — | ? | NNW flank · Correlation: Tephrochronology |
| 1,200 BCE ± 50 years | — | ? | Isotopic: 14C (calibrated) |
| 1,800 BCE ± 100 years | — | 2 | Northwest flank · Isotopic: 14C (calibrated) |
Data: Global Volcanism Program, Smithsonian Institution (#284060)