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 |
|---|---|---|---|
| 20 December 2016 | 30 August 2017 | 3 | Central vent, just below sea level · Observations: Reported |
| 6 July 1992 | 24 July 1992 | 3 | North tip of island (NE of 1927 dome) · Observations: Reported |
| 31 October 1931 | — | 1 | 1926-1927 dome · Observations: Reported |
| 16 July 1926 | 2 July 1928 | 2 | Between New and Old Bogoslof · Observations: Reported |
| 16 September 1909 | 19 September 1910 | 2 | Tahoma Peak · Observations: Reported |
| 1 March 1906 | 1 September 1907 | 3 | Metcalf Peak, McCullough Peak · Observations: Reported |
| 27 September 1883 | 2 July 1895 | 3 | New Bogoslof (Grewingk) · Observations: Reported |
| 2 July 1806 | 2 July 1823 | 2 | Old Bogoslof (Castle Rock) · Observations: Reported |
| May 1796 | 2 July 1804 | 3 | Old Bogoslof (Castle Rock) · Observations: Reported |
Data: Global Volcanism Program, Smithsonian Institution (#311300)