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 |
|---|---|---|---|
| 1660 ± 30 years | — | ? | Dome NW of summit · Isotopic: 14C (calibrated) |
| c. 340 | — | ? | West side of summit dome complex · Isotopic: 14C (calibrated) |
| 580 BCE ± 300 years | — | ? | Summit lava dome · Isotopic: 14C (calibrated) |
Data: Global Volcanism Program, Smithsonian Institution (#245030)