Mount St. Helens experienced a cataclysmic eruption on May 18, 1980. The northern side of the volcano collapsed, triggering a forceful blast that raced across the landscape, an explosive eruption column that rose vertically in the air, pyroclastic flows that swept down the mountain, and a series of large mudflows that raced down river valleys toward the Columbia River. What did this eruption teach us about volcanic processes and management of volcanic crises? And most importantly, where do we go from here? Presented by Heather Wright, Geologist, Volcano Disaster Assistance Program, Cascades Volcano Observatory.
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