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 |
|---|---|---|---|
| 2 July 1820 ± 100 years | — | 1 | West flank (Jigoku-dani) · Correlation: Tephrochronology |
| 200 ± 75 years | — | ? | Isotopic: 14C (calibrated) |
| c. 8,050 BCE | — | ? | Hiyori-yama lava dome · Correlation: Tephrochronology |
Data: Global Volcanism Program, Smithsonian Institution (#285034)