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Bookmark or Share- St. Helens - Global Volcanism ProgramShortly before noon on 1 October, Mount St. Helens emitted a plume of steam and minor ash from an area of new crevasses that had opened in a portion of the crater glacier between the headwall of the 1980 crater and the lava dome. This marked the first eruption from Mount St. Helens since a series of phreatic explosions during 1989-1991.
- Mount St. Helens | U.S. Geological Survey - USGS.govMount St. Helens is primarily an explosive dacite volcano with a complex magmatic system. The volcano was formed during four eruptive stages beginning about 275,000 years ago and has been the most active volcano in the Cascade Range during the Holocene.
- Mount St. Helens National Volcanic Monument - US Forest ServiceSurviving plants and animals rise out of the ash, colonizing plants catch hold of the earth, birds and animals find a niche in a different forest on the slopes of Mount St. Helens. The volcano continued to erupt until 1986, violently at first, then quietly building a lava dome.
- Mount St. Helens, Washington - Summary - USGSMount St. Helens (8,364 feet, 9,677 feet before May 18, 1980) is located in southwestern Washington about 50 miles northeast of Portland, Oregon, and is one of several lofty volcanic peaks that dominate the Cascade Range of the Pacific Northwest.
- 30 Cool Facts about Mount St. Helens - USGS Publications WarehouseCommemorating the 30th anniversary of the 1980 eruptions of Mount St. Helens. 1—During the past 4,000 years, Mount St. Helens has erupted more frequently than any other volcano in the Cascade Range. 2—Most of Mount St. Helens is younger than 3,000 years old (younger than the pyramids of Egypt).
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