This was the first historical eruption at the volcano. 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 From 29th March to 4th April 1982 three large explosive eruptions occurred at El Chichon volcano. 2008). Fresh pumices from the three layers are indistinguishable porphyritic trachyandesites with 55.9 wt. Solfataras and hot springs were present in the crater and on the flanks. The pumices contain 58 wt. The 1982 eruptions of El Chichón Volcano produced three major pumice- and ash-fall layers. The 1982 eruptions produced a 1 km wide crater which now contains a lake. We will be able to de- termine whether such a smoothing results in a more consistent signal across the Greenland ice sheet from This is a view of the El Chichon caldera, formed during the very explosive eruptions of late March and early April of 1982. ZIELINSKI ET AL.' % SiO 2 , 2.2% MgO, 2.8% K 2 O, 0.4% P 2 O 5 , and over 1.2% SO 3 . Before its devastating eruption in 1982, El Chichon Volcano was little known and did not appear on any listings of hazardous volcanoes. Subsequent geologic studies, based on stratigraphic and radiocarbon investigations, showed that at least three explosive eruptions had occurred previously at this volcano. 1984; Macias et al. No previous eruptions of El Chichón are known in historic time. 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. Before the 1982 eruption, the volcano was heavily forested, with a shallow crater, 1,900 X 900 m, elongate NNW-SSE. In 1982, the El Chichón volcano erupted in Chiapas, Mexico, killing 2,000 people. 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. The El Chichon volcano complex in Chiapas, Mexico, as seen on March 11, 1986, when the devastation of the 1982 eruption is still clear. 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. It was the worst volcanic disaster in Mexico's recorded history. 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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