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 |
|---|---|---|---|
| 29 July 1968 | 16 December 2010 | 3 | W flank & summit · Observations: Reported |
| 5 October 1922 | 23 October 1922 | 2 | Observations: Reported |
| 1750 ± 50 years | — | 0 | Summit and NW flank (A2 lava flows) · Correlation: Tephrochronology |
| c. 1440 | — | 2 | Isotopic: 14C (uncalibrated) |
| c. 1400 | — | 4 | Isotopic: 14C (uncalibrated) |
| c. 1030 | — | 4 | Correlation: Tephrochronology |
| c. 1020 | — | 4 | Correlation: Tephrochronology |
| 750 ± 50 years | — | 4 | Correlation: Anthropology |
| c. 700 | — | 4 | Correlation: Tephrochronology |
| 650 ± 100 years | — | 4 | Isotopic: 14C (calibrated) |
| c. 550 | — | 4 | Correlation: Tephrochronology |
| c. 400 | — | 4 | Correlation: Anthropology |
| 170 BCE ± 200 years | — | 4 | Isotopic: 14C (calibrated) |
| c. 270 BCE | — | 4 | Correlation: Tephrochronology |
| 380 BCE ± 200 years | — | 4 | Isotopic: 14C (calibrated) |
| 830 BCE ± 500 years | — | 0 | Correlation: Tephrochronology |
| 1,250 BCE ± 200 years | — | 4 | Isotopic: 14C (calibrated) |
| c. 1,450 BCE | — | 4 | Correlation: Tephrochronology |
| c. 1,650 BCE | — | 4 | Correlation: Tephrochronology |
| 1,770 BCE ± 100 years | — | ? | Cerro Chato · Isotopic: 14C (calibrated) |
| c. 2,250 BCE | — | 4 | Correlation: Tephrochronology |
| c. 2,800 BCE | — | 4 | Correlation: Tephrochronology |
| 3,190 BCE ± 100 years | — | ? | Cerro Chato · Isotopic: 14C (uncalibrated) |
| c. 3,350 BCE | — | 4 | Correlation: Tephrochronology |
| c. 3,900 BCE | — | 4 | Correlation: Tephrochronology |
| c. 4,450 BCE | — | ? | Correlation: Tephrochronology |
| 5,060 BCE ± 150 years | — | 4 | Isotopic: 14C (calibrated) |
Data: Global Volcanism Program, Smithsonian Institution (#345033)