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 |
|---|---|---|---|
| January 1790 | — | 2 | Nishi-yama · Observations: Reported |
| 19 August 1759 | — | 2 | Nishi-yama · Observations: Reported |
| 18 August 1741 | May 1742 | 4 | Nishi-yama · Observations: Reported |
| 250 ± 150 years | — | ? | Nishi-yama · Isotopic: 14C (uncalibrated) |
| 800 BCE ± 100 years | — | ? | Nishi-yama · Isotopic: 14C (uncalibrated) |
Data: Global Volcanism Program, Smithsonian Institution (#285010)