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 |
|---|---|---|---|
| 475 ± 215 years | — | 2 | Belknap Crater · Isotopic: 14C (calibrated) |
| 685 BCE ± 50 years | — | 2 | South Belknap and Twin Craters · Isotopic: 14C (calibrated) |
| 1,071 BCE ± 241 years | — | 0 | Little Belknap · Isotopic: 14C (calibrated) |
| c. 5,050 BCE | — | ? | Correlation: Magnetism |
Data: Global Volcanism Program, Smithsonian Institution (#322060)