Eruption of El Chichón Volcano, Chiapas, Mexico, 28 March to 7 April 1982

Science  24 Dec 1982:
Vol. 218, Issue 4579, pp. 1307-1308
DOI: 10.1126/science.218.4579.1307


El Chichón volcano erupted at 2322 hours on 28 March 1982 after being dormant during historic times. Three major eruptions of tephra occurred between that date and 7 April, discharging approximately 0.3 cubic kilometer of andesitic pyroclastic material. The initial eruption produced crystal-rich tephra of higher silica and alkali content than the lithic pyroclastic materials of the second and third eruptions. The initial tephra consists of primarily juvenile materials, whereas the later eruptions produced both lithic and juvenile fractions.