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 |
|---|---|---|---|
| 16 August 1830 | — | 2 | Mount Finch · Observations: Reported |
| 11 October 1826 | 16 January 1827 | 3 | Mount Finch · Observations: Reported |
| c. 1795 | — | ? | Observations: Reported |
| 400 ± 50 years | — | ? | Turquoise cone · Isotopic: 14C (uncalibrated) |
| 3,170 BCE ± 75 years | — | 5 | Turquoise cone · Isotopic: 14C (uncalibrated) |
| 7,420 BCE ± 200 years | — | 6 | NE and SW parts of Fisher caldera · Isotopic: 14C (uncalibrated) |
Data: Global Volcanism Program, Smithsonian Institution (#311350)