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Mount St Helens Eruption, Exactly What Happened 35 Years Ago

Ash column from the eruption of Mount St. Helens on May 18, 1980 from the southwest. Mount Adams is in the background. (USGS)
Ash column from the eruption of Mount St. Helens on May 18, 1980 from the southwest. Mount Adams is in the background. (USGS)

The violent eruption of Mount St. Helens on May 18, 1980 was not a one day event. For two months magma had been accumulating below the volcano,...



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