Mount St. Helens May 18, 1980 eruption

Mount St. Helens May 18, 1980 eruption

Credit: USGS

Mount St. Helens May 18, 1980 eruption

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by Susan Wyatt / KING5.com

NWCN.com

Posted on May 18, 2010 at 10:13 AM

Updated Wednesday, May 18 at 10:45 AM

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.

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