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 |
|---|---|---|---|
| 17 August 915 | — | 5 | Goshikiiwa (NE rim Nakanoumi crater) · Observations: Reported |
| c. 750 BCE | — | 4 | Nakanoumi · Isotopic: 14C (calibrated) |
| c. 4,150 BCE | — | 5 | Goshikiiwa (Nakanoumi) · Isotopic: 14C (calibrated) |
| c. 5,550 BCE | — | 3 | Goshikiiwa · Isotopic: 14C (calibrated) |
| c. 6,250 BCE | — | 4 | Goshikiiwa · Isotopic: 14C (calibrated) |
| c. 7,250 BCE | — | 5 | Goshikiiwa · Isotopic: 14C (calibrated) |
| c. 8,250 BCE | — | 5 | Goshikiiwa · Isotopic: 14C (calibrated) |
| c. 9,490 BCE | — | 3 | Nakanoumi · Isotopic: 14C (calibrated) |
Data: Global Volcanism Program, Smithsonian Institution (#283271)