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Fun Fact May 18, 2020.

18 May 2020

The landscape in the Pacific Northwest changed on this date in 1980.  Forty years ago Mount St. Helens, a stratovolcano located in Skamania County in Washington state, erupted.  The eruption was the deadliest and most economically destructive volcanic event in U.S. history. Fifty-seven people were killed; 250 homes, 47 bridges, 15 miles of railways, and 185 miles of highway were destroyed. There was a massive avalanche of debris triggered by a magnitude 5.1 earthquake.  That earthquake triggered a lateral eruption that took the mountain from an elevation just under ten thousand feet to just over eight thousand feet, leaving a 1 mile wide horseshoe-shaped crater. The debris avalanche was up to three quarters of a cubic miles in volume. The Mount St. Helens National Volcanic Monument was created to preserve the volcano and allow for the eruption’s aftermath to be scientifically studied.

Fun Fact May 18, 2020.