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 |
|---|---|---|---|
| 950 ± 6,000 years | — | 3 | SW flank of Ice Peak · Radiogenic: Fission track |
| 630 ± 150 years | — | ? | NNE flank (Williams Cone) · Isotopic: 14C (uncalibrated) |
| 750 BCE ± 100 years | — | ? | Correlation: Tephrochronology |
| 6,520 BCE ± 200 years | — | ? | North flank? · Isotopic: 14C (uncalibrated) |
Data: Global Volcanism Program, Smithsonian Institution (#320060)