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 |
|---|---|---|---|
| 1550 ± 50 years | — | ? | Tephra sample from E flank of edifice · Isotopic: 14C (calibrated) |
| c. 50 BCE | — | ? | Isotopic: 14C (uncalibrated) |
| 6,200 BCE ± 1,680 years | — | ? | Tephra sample from Deka Wede (W of caldera) · Isotopic: 14C (calibrated) |
| 7,280 BCE ± 2,000 years | — | ? | Tephra sample from Haroresa (S of caldera) · Isotopic: 14C (calibrated) |
Data: Global Volcanism Program, Smithsonian Institution (#221270)