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Eruptive activity chart

Summary of the eruptive activity at Mount St. Helens through the end of 1989. Beginning in 1981, the eruption has been characterized mainly by intermittent dome-building activity, punctuated by occasional, smaller explosive bursts. The inset shows a typical explosion plume, some of which have risen to 20,000 feet (Photograph by Jim Zollweg).


Subsequent Eruptive Activity

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Contact: John Watson

Last updated: 06.25.97