On May 18, 1980, at 8:32 a.m., Mount St. Helens in Skamania County, Washington, United States, experienced a catastrophic explosive eruption which had a volcanic explosivity index of 5. It was the fir
The eruption column, May 18, 1980
Photo showing the bulge growing due to a cryptodome on April 27
Lakes nearest to Mount St. Helens have been partly covered with fallen trees since the eruption. This photograph was taken in 2012.
The North Fork Toutle River valley filled with landslide deposits
Mount St. Helens
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Mount St. Helens is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States. It lies 52 miles northeast of Portland, Oregon, and 98 miles s
1980 eruption of Mount St. Helens
…On May 18, 1980, at 8:32 a.m., Mount St. Helens in Skamania County, Washington, United States, experienced a catastrophic explosive eruption which had a volcanic explosivity index of 5. It was the…
3,000 ft (900 m) high steam plume on May 19, 1982, two years and a day after the 1980 major eruption that created the visible gap on the north side of the mountain
Mount St. Helens pictured the day before the 1980 eruption, which removed much of the northern face of the mountain, leaving a large crater
Aerial view with Mount Adams in background
East Dome on the east flank of Mount St. Helens in 2013.