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| You are in: Museum of Natural History >> Hall of Geology >> Mountains >> MOUNT SAINT HELENS | |
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Mount St. Helens National Volcanic Monument
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| At 8:32 Sunday morning, May 18, 1980, Mount
St. Helens erupted.
Shaken by an earthquake measuring 5.1 on the Richter scale, the north face of this tall symmetrical mountain collapsed in a massive rock debris avalanche. Nearly 230 square miles of forest was blown over or left dead and standing. At the same time a mushroom-shaped column of ash rose thousands of feet skyward and drifted downwind, turning day into night as dark, gray ash fell over eastern Washington and beyond. The eruption lasted 9 hours, but Mount St. Helens and the surrounding landscape were dramatically changed within moments. In 1982 the President and Congress created the 110,000-acre National Volcanic Monument for research, recreation, and education. Inside the Monument, the environment is left to respond naturally to the disturbance. |
| On The Monument Today | |
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Special Conditions Within The MonumentOctober 02 2004 - USGS Issues Level III Volcano Alert Mount St. Helens Updates - The latest information, including earthquake swarm information, USGS Advisory Notices, visitor access information, hiking trails and camping information. Mount St. Helens VolcanoCam - View Mount St. Helens on the web! |
| General Visitor Information | |
![]() May 18, 1980 eruption - USGS photograph by Austin Post. |
About Mount St.
Helens
Climb, Hike, Learn
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![]() Snow-covered Coldwater Ridge Visitor Center Sign - December 2002 |
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Visitor Centers & Information Stations
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![]() May 1980 Eruption |
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