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 Subsequent geologic studies, based on stratigraphic and radiocarbon investigations, showed that at least three explosive eruptions had occurred previously at this volcano. This is a view of the El Chichon caldera, formed during the very explosive eruptions of late March and early April of 1982. We will be able to de- termine whether such a smoothing results in a more consistent signal across the Greenland ice sheet from The pumices contain 58 wt. Fresh pumices from the three layers are indistinguishable porphyritic trachyandesites with 55.9 wt. “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 … Before its devastating eruption in 1982, El Chichon Volcano was little known and did not appear on any listings of hazardous volcanoes. Solfataras and hot springs were present in the crater and on the flanks. This was the first historical eruption at the volcano. 1982 EL CHICHON ERUPTION IN GREENLAND SNOW 30,033 parison of annual signals versus subseasonal signals is a form of smoothing of the original data set, which should increase the signal:noise ratio. 1982 Eruption El Chichon Volcano erupted on 28th March 1982 after several months of increased seismic activity. 2008). Prior to the 1982 eruptions the summit of the volcano consisted of a large lava dome within a shallow caldera. No previous eruptions of El Chichón are known in historic time. The caldera is about a kilometer wide and a few hundred meters deep. The 1982 eruptions produced a 1 km wide crater which now contains a lake. 1984; Macias et al. 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. The El Chichon volcano complex in Chiapas, Mexico, as seen on March 11, 1986, when the devastation of the 1982 eruption is still clear. At El Chichón in 1982, the initial VEI 3 explosion was followed 6 days later by a VEI 5 eruption (GVP, 1982;Espíndola et al., 2006; De la Cruz-Reyna and Martin Del Pozzo, 2009). 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