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 |
|---|---|---|---|
| 1240 ± 50 years | — | ? | North flank (Redondo, Chufquén) · Isotopic: 14C (uncalibrated) |
| 920 BCE ± 75 years | — | 5 | SW caldera rim (Alpehué crater) · Isotopic: 14C (uncalibrated) |
Data: Global Volcanism Program, Smithsonian Institution (#357111)