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 |
|---|---|---|---|
| 8 March 2014 | 18 September 2014 | 2 | Summit crater · Observations: Reported |
| 21 April 2009 | 22 June 2009 | 1 | Observations: Reported |
| 1 May 1999 | 16 September 1999 | 1 | Observations: Reported |
| 12 July 1988 | 13 July 1988 | 1 | Observations: Reported |
| 16 August 1973 | — | 1 | Observations: Reported |
| 23 June 1969 | 16 August 1969 | 2 | Observations: Reported |
| 7 May 1967 | 16 July 1967 | 2 | Observations: Reported |
| 2 July 1966 | — | 2 | Observations: Reported |
| 16 December 1960 | 16 January 1961 | 2 | Observations: Reported |
| 13 September 1958 | 5 November 1958 | 2 | Observations: Reported |
| 17 April 1958 | 7 May 1958 | 2 | Observations: Reported |
| 8 February 1957 | 8 February 1957 | 2 | Observations: Reported |
| 12 November 1955 | 20 December 1955 | 2 | Observations: Reported |
| 16 August 1953 | 16 October 1953 | 2 | Observations: Reported |
| 26 June 1951 | 1 January 1952 | 2 | Observations: Reported |
| 11 February 1951 | — | 2 | Observations: Reported |
| 14 November 1948 | 15 December 1948 | 2 | Observations: Reported |
| 9 May 1944 | 30 October 1944 | 2 | Observations: Reported |
| 2 October 1943 | 5 January 1944 | 2 | Observations: Reported |
| 15 March 1940 | 15 April 1940 | 2 | Observations: Reported |
| 4 December 1939 | 4 December 1939 | 2 | Observations: Reported |
| 29 March 1939 | 15 July 1939 | 2 | Observations: Reported |
| 2 July 1937 | — | ? | Observations: Reported |
| 12 May 1933 | 13 May 1933 | 1 | Observations: Reported |
| 1 July 1932 | 10 September 1932 | 2 | Observations: Reported |
| 2 April 1930 | 13 April 1930 | 2 | Observations: Reported |
| 6 June 1929 | 15 June 1929 | 2 | Observations: Reported |
| 20 March 1928 | 12 May 1928 | 2 | Observations: Reported |
| 27 February 1927 | 27 February 1927 | 2 | Observations: Reported |
| 23 November 1926 | 30 November 1926 | 2 | Observations: Reported |
| 2 June 1923 | 2 June 1923 | 2 | Observations: Reported |
| 14 July 1904 | 9 August 1904 | 2 | Observations: Reported |
| 6 August 1890 | 29 August 1890 | 2 | Observations: Reported |
| 21 March 1885 | 30 March 1885 | 2 | Observations: Reported |
| 2 November 1875 | 26 December 1875 | 2 | Observations: Reported |
| 29 May 1875 | 4 June 1875 | 2 | Observations: Reported |
| 19 March 1860 | 11 April 1860 | 2 | Observations: Reported |
| 1 December 1849 | — | 2 | Observations: Reported |
| 20 March 1847 | — | 2 | Observations: Reported |
| 16 September 1835 | 16 September 1835 | 2 | Observations: Reported |
| 16 October 1825 | — | 2 | Observations: Reported |
| 11 August 1772 | 12 August 1772 | 2 | Observations: Reported |
Data: Global Volcanism Program, Smithsonian Institution (#263180)