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Geologic and radiometric-age data indicate that El Chicho??n was frequently and violently active during the Holocene, including eruptive episodes about 600, 1250, and 1700 years ago and several undated, older eruptions. These episodes, involving explosive eruptions of sulfur-rich magma and associated dome-growth processes, were apparently separated by intervals of approximately 350 to 650 years. Some of El Chicho??n's eruptions may correlate with unusual atmospheric phenomena around A.D. 1300 and possibly A.D. 623.
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Holocene eruptive activity of El Chicho??n Volcano, Chiapas, Mexico