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 August 838 | — | 4 | Tenjo-san · Observations: Reported |
| 100 BCE ± 950 years | — | ? | NW tip of island (Kobe-yama) · Chem/Bio: Hydration Rind |
| 750 BCE ± 700 years | — | ? | N tip of island (Anano-yama, Hanatabe) · Chem/Bio: Hydration Rind |
| c. 8,050 BCE | — | ? | Jogo-yama · Correlation: Tephrochronology |
Data: Global Volcanism Program, Smithsonian Institution (#284030)