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 |
|---|---|---|---|
| 31 December 1879 | 26 March 1880 | 3 | Islas Quemadas, Lake Ilopango · Observations: Reported |
| 450 ± 30 years | — | 6 | Isotopic: 14C (calibrated) |
Data: Global Volcanism Program, Smithsonian Institution (#343060)