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 |
|---|---|---|---|
| 22 June 1922 | continuing | 3 | SW flank (Santiaguito) · Observations: Reported |
| 2 July 1903 | 2 July 1913 | 2 | SW flank (east end of 1902 crater) · Observations: Reported |
| 24 October 1902 | 12 November 1902 | 6 | SW flank · Observations: Reported |
Data: Global Volcanism Program, Smithsonian Institution (#342030)