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 |
|---|---|---|---|
| c. 1250 | — | ? | Isotopic: 14C (uncalibrated) |
| c. 1200 | — | ? | Isotopic: 14C (uncalibrated) |
| c. 850 | — | ? | Isotopic: 14C (uncalibrated) |
| c. 150 | — | ? | Isotopic: 14C (uncalibrated) |
| c. 50 | — | 0 | Correlation: Tephrochronology |
| c. 150 BCE | — | ? | Isotopic: 14C (uncalibrated) |
| 550 BCE ± 500 years | — | ? | Correlation: Tephrochronology |
| 650 BCE ± 800 years | — | ? | Isotopic: 14C (uncalibrated) |
| c. 850 BCE | — | ? | Isotopic: 14C (uncalibrated) |
| c. 1,150 BCE | — | ? | Isotopic: 14C (uncalibrated) |
| c. 2,050 BCE | — | ? | Isotopic: 14C (uncalibrated) |
| c. 2,550 BCE | — | ? | Isotopic: 14C (uncalibrated) |
| 3,050 BCE ± 1,000 years | — | 0 | Correlation: Tephrochronology |
| c. 4,050 BCE | — | ? | Isotopic: 14C (uncalibrated) |
| c. 6,050 BCE | — | ? | Isotopic: 14C (uncalibrated) |
| c. 6,650 BCE | — | ? | Correlation: Tephrochronology |
| c. 7,250 BCE | — | ? | Correlation: Tephrochronology |
| c. 7,350 BCE | — | 0 | Summit, north and west flanks · Correlation: Tephrochronology |
| 7,420 BCE ± 300 years | — | ? | Shastina and Black Butte · Isotopic: 14C (uncalibrated) |
| 7,650 BCE ± 100 years | — | 4 | Summit, S flank (Red Banks), and Shastina · Isotopic: 14C (uncalibrated) |
| c. 7,750 BCE | — | ? | Isotopic: 14C (uncalibrated) |
| c. 8,050 BCE | — | ? | Correlation: Tephrochronology |
Data: Global Volcanism Program, Smithsonian Institution (#323010)