See images from one of the most destructive volcanic eruptions in U.S. history.
At 8:32 a.m. on May 18, 1980 a 5.1 magnitude earthquake that hit and within minutes the volcano’s north flank collapsed, creating the largest landslide in recorded history, according toThat landslide triggered powerful explosions which sent ash, steam, rocks and volcanic gas upward and outward. The lateral blast scorched and flattened about 230 square miles of dense forest, blanketing the area in hot debris.
Within 15 minutes, a plume of volcanic ash rose over 80,000 feet. Over the next few days winds blew the 520 million tons of ash east across the U.S. causing complete darkness 250 miles away in Spokane. The ash circled the globe in 15 days.and a major recreational destination.Contributing: The Associated Press
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