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 |
|---|---|---|---|
| 7 September 1880 | 27 November 1880 | 2 | Sherman Crater · Observations: Reported |
| 2 July 1870 | — | 2 | Sherman Crater · Observations: Reported |
| 16 July 1863 | — | 2 | Sherman Crater · Observations: Reported |
| 16 November 1859 | 26 April 1860 | 2 | Sherman Crater · Observations: Reported |
| 2 July 1858 | — | 2 | Sherman Crater · Observations: Reported |
| 2 July 1854 | — | 2 | Sherman Crater · Observations: Reported |
| 1 December 1852 | 16 January 1853 | 2 | Sherman Crater · Observations: Reported |
| 2 July 1843 | — | 3 | Sherman Crater · Observations: Reported |
| c. 2 July 1820 | — | 2 | Observations: Reported |
| c. 4,550 BCE | — | 3 | Sherman Crater? · Isotopic: 14C (calibrated) |
| c. 7,850 BCE | — | ? | South flank (Schreibers Meadow Cone) · Isotopic: 14C (calibrated) |
Data: Global Volcanism Program, Smithsonian Institution (#321010)