Izalco – stratovolcano, El Salvador

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
28 October 1966	16 November 1966	0	SSE flank (550 m below summit) · Observations: Reported
4 November 1948	1 December 1957	3	Summit, SW and NE flanks · Observations: Reported
16 February 1939	16 February 1948	2	Summit and SSE flank · Observations: Reported
c. 2 July 1937	2 July 1938	2	Observations: Reported
30 November 1933	12 January 1934	2	Observations: Reported
31 March 1931	—	2	Observations: Reported
16 April 1930	—	0	Outer slope of eastern summit crater · Observations: Reported
2 July 1927	2 July 1928	2	Observations: Reported
26 December 1925	16 January 1927	3	Observations: Reported
16 March 1924	—	2	Observations: Reported
29 October 1920	10 April 1921	2	SE flank · Observations: Reported
16 January 1912	26 January 1916	2	Summit and NE flank · Observations: Reported
16 November 1903	16 March 1905	2	Summit and east flank · Observations: Reported
10 May 1902	30 December 1902	2	Summit and NE flank · Observations: Reported
31 December 1899	16 March 1900	2	Observations: Reported
2 July 1891	16 July 1898	2	Observations: Reported
26 March 1890	20 April 1890	0	Summit and upper east flank · Observations: Reported
2 July 1887	2 July 1889	2	Observations: Reported
2 July 1885	—	2	Observations: Reported
9 March 1884	10 March 1884	2	Observations: Reported
5 September 1883	13 November 1883	2	Observations: Reported
12 July 1882	—	2	Observations: Reported
1 January 1881	—	0	Observations: Reported
25 December 1879	16 March 1880	2	Observations: Reported
2 July 1878	—	?	Observations: Reported
16 December 1872	19 March 1873	2	Observations: Reported
1 March 1869	18 June 1869	2	Summit and east flank · Observations: Reported
16 February 1868	17 February 1868	2	Observations: Reported
16 April 1867	16 August 1867	2	Observations: Reported
27 April 1866	15 August 1866	2	Observations: Reported
15 May 1864	15 June 1865	2	Summit and NE flank · Observations: Reported
2 July 1863	—	0	Observations: Reported
8 December 1859	22 January 1860	0	Observations: Reported
6 February 1858	16 July 1859	2	Observations: Reported
15 February 1857	19 February 1857	2	Observations: Reported
24 May 1856	1 September 1856	2	Summit and south flank · Observations: Reported
13 May 1854	8 June 1854	2	Observations: Reported
2 July 1850	—	2	Observations: Reported
16 June 1844	16 October 1844	2	Observations: Reported
2 July 1842	—	2	Observations: Reported
2 July 1838	2 July 1840	2	Observations: Reported
2 July 1836	—	2	Observations: Reported
2 July 1825	—	2	Observations: Reported
2 July 1817	—	2	Observations: Reported
2 July 1805	2 July 1807	2	Observations: Reported
2 July 1802	2 July 1803	2	Observations: Reported
April 1798	—	2	Observations: Reported
29 March 1793	September 1793	2	Observations: Reported
July 1783	—	0	Observations: Reported
c. 1772	—	2	Observations: Reported
23 February 1770	—	2	Observations: Reported

Data: Global Volcanism Program, Smithsonian Institution (#343030)