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English: On May 18, 1980, at 8:32 a.m. Pacific Daylight Time, a magnitude 5.1 earthquake shook Mount St. Helens. The bulge and surrounding area slid away in a gigantic rockslide and debris avalanche, releasing pressure, and triggering a major pumice and ash eruption of the volcano. Thirteen-hundred feet (400 meters) of the peak collapsed or blew outwards. As a result, 24 square miles (62 square kilometers) of valley was filled by a debris avalanche, 250 square miles (650 square kilometers) of recreation, timber, and private lands were damaged by a lateral blast, and an estimated 200 million cubic yards (150 million cubic meters) of material was deposited directly by lahars (volcanic mudflows) into the river channels. Sixty-one people were killed or are still missing. USGS Photograph taken on May 18, 1980, by Austin Post.

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  • Mount St. Helens

    Mount St. Helens is an active stratovolcano located in Skamania County, Washington, in the...

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Date/TimeThumbnailDimensionsUserComment
current16:42, March 4, 2010Thumbnail for version as of 16:42, March 4, 20102,994 × 4,500 (1.43 MB)AJM (Talk | contribs)
16:18, March 4, 2010Thumbnail for version as of 16:18, March 4, 20102,994 × 4,500 (1.43 MB)AJM (Talk | contribs)English: On May 18, 1980, at 8:32 a.m. Pacific Daylight Time, a magnitude 5.1 earthquake shook Mount St. Helens. The bulge and surrounding area slid away in a gigantic rockslide and debris avalanche, releasing pressure, and triggering a major pumice and a

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