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Solfataras and hot springs were present in the crater and on the flanks. 2008). The pumices contain 58 wt. From 29th March to 4th April 1982 three large explosive eruptions occurred at El Chichon volcano. Subsequent geologic studies, based on stratigraphic and radiocarbon investigations, showed that at least three explosive eruptions had occurred previously at this volcano. This was the first historical eruption at the volcano. We will be able to de- termine whether such a smoothing results in a more consistent signal across the Greenland ice sheet from 1982 Eruption El Chichon Volcano erupted on 28th March 1982 after several months of increased seismic activity. “The eruption of El Chichón is overlooked in comparison to other historic eruptions like Mount St. Helens in 1980 or the Pinatubo eruption in 1991, yet it teaches us a number of important lessons about how we can be better prepared for volcanic disasters and the potential influence of … The caldera is about a kilometer wide and a few hundred meters deep. El Chichón has been sporadically active during the recent Holocene period and in the geological record there are a minimum of 12 eruptions detected during the past ~8000 years; none of which are thought to have been larger than the 1982 eruption (Tilling et al. Before the 1982 eruption, the volcano was heavily forested, with a shallow crater, 1,900 X 900 m, elongate NNW-SSE. Fresh pumices from the three layers are indistinguishable porphyritic trachyandesites with 55.9 wt. The 1982 eruptions produced a 1 km wide crater which now contains a lake. It was the worst volcanic disaster in Mexico's recorded history. This is a view of the El Chichon caldera, formed during the very explosive eruptions of late March and early April of 1982. Prior to the 1982 eruptions the summit of the volcano consisted of a large lava dome within a shallow caldera. El Chichón volcano in southern Mexico forms a broad symmetrical cone with a diameter of 10 km at itsbase and is capped by a 600 m wide crater containing a 80 m high andesitic lava dome. ZIELINSKI ET AL.' 1984; Macias et al. Volcanic Eruption, El Chichon´ On March 29th, April 3rd and April 4th, 1982, the El Chichon volcano in Southern Mexico erupted, injecting´ about 7 million metric tonnes of sulfur dioxide (SO The El Chichon volcano complex in Chiapas, Mexico, as seen on March 11, 1986, when the devastation of the 1982 eruption is still clear. Before its devastating eruption in 1982, El Chichon Volcano was little known and did not appear on any listings of hazardous volcanoes. No previous eruptions of El Chichón are known in historic time. In 1982, the El Chichón volcano erupted in Chiapas, Mexico, killing 2,000 people. % SiO 2 , 2.2% MgO, 2.8% K 2 O, 0.4% P 2 O 5 , and over 1.2% SO 3 . The 1982 eruptions of El Chichón Volcano produced three major pumice- and ash-fall layers. 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