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 |
|---|---|---|---|
| 23 January 1606 | — | 2 | Submarine flank · Observations: Reported |
| 27 October 1605 | — | 2 | Nishi-yama SE flank · Observations: Reported |
| February 1518 | 1523 | 2 | Nishi-yama · Observations: Reported |
| 7 December 1487 | — | 2 | Nishi-yama · Observations: Reported |
| 850 ± 200 years | — | ? | Nishi-yama summit and SE flank · Isotopic: 14C (calibrated) |
| 150 BCE ± 50 years | — | ? | Nishi-yama · Isotopic: 14C (calibrated) |
| 350 BCE ± 500 years | — | 3 | NW flank of Higashi-yama · Correlation: Tephrochronology |
| 1,150 BCE ± 700 years | — | ? | SE flank of Nishi-yama (Kanda-yama) · Correlation: Tephrochronology |
| 1,250 BCE ± 800 years | — | ? | Nishi-yama · Correlation: Tephrochronology |
| c. 2,050 BCE | — | 5 | SE of Nishi-yama, NE of Higashi-yama · Correlation: Tephrochronology |
| 2,450 BCE ± 500 years | — | 4 | Nishi-yama · Correlation: Tephrochronology |
| 2,550 BCE ± 500 years | — | 3 | S flank of Higashi-yama (Myohoji) · Correlation: Tephrochronology |
| 2,700 BCE ± 100 years | — | 3 | Between Nishi-yama & Higashi-yama · Isotopic: 14C (calibrated) |
| 3,350 BCE ± 1,300 years | — | ? | Nishi-yama · Correlation: Tephrochronology |
| c. 4,650 BCE | — | 5 | Nishi-yama · Correlation: Tephrochronology |
| 5,020 BCE ± 370 years | — | 3 | Higashi-yama south flank · Correlation: Tephrochronology |
| 7,650 BCE ± 3,000 years | — | ? | Nishi-yama · Correlation: Tephrochronology |
| 8,020 BCE ± 2,640 years | — | 4 | Nishi-yama · Correlation: Tephrochronology |
Data: Global Volcanism Program, Smithsonian Institution (#284050)