| Abstract: | Mount St. Helens, located in southwestern Washington about 50 miles northeast of Portland, Oregon, is one of several lofty volcanic peaks that dominate the Cascade Range of the Pacific Northwest; the range extends from Mount Garibaldi in British Columbia, Canada, to Lassen Peak in northern California. Geologists call Mount St. Helens a composite volcano (or stratovolcano), a term for steepsided, often symmetrical cones constructed of alternating layers of lava flows, ash, and other volcanic debris. Composite volcanoes tend to erupt explosively and pose considerable danger to nearby life and property. In contrast, the gently sloping shield volcanoes, such as those in Hawaii, typically erupt nonexplosively, producing fluid lavas that can flow great distances from the active vents. Although Hawaiian-type eruptions may destroy property, they rarely cause death or injury. Before 1980, snow-capped, gracefully symmetrical Mount St. Helens was known as the "Fujiyama of America." Mount St. Helens, other active Cascade volcanoes, and those of Alaska form the North American segment of the circum-Pacific "Ring of Fire," a notorious zone that produces frequent, often destructive, earthquake and volcanic activity. |
| Genre: | USGS Unnumbered Series |
| ProdID: | 7000008 |
| Citation Author: | Tilling, Robert I.; Topinka, Lyn J.; Swanson, Donald A. |
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| Citation Edition: | Revised Edition - 1990; Version 1.01 March 19, 2002 |
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| Citation Language: | English |
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| Citation LatN: | 46.3892 |
| Citation LatS: | 45.5477 |
| Citation LonE: | -121.5148 |
| Citation LonW: | -122.2501 |
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| Citation Phsyical Description: | HTML Document |
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| Citation Publisher: | U.S. Geological Survey |
| Citation Series: | General Interest Publication |
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| Citation Search Results Text: | Eruptions of Mount St. Helens : Past, present, and future; 1990; USGS Unnumbered Series; Tilling, Robert I.; Topinka, Lyn J.; Swanson, Donald A. |
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| Citation Year: | 1990 |
| Type: | citation/reference |
| Text: | Eruptions of Mount St. Helens : Past, present, and future; 1990; USGS Unnumbered Series; Tilling, Robert I.; Topinka, Lyn J.; Swanson, Donald A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/gip/msh/contents.html |
| URL (ERRATA): | http://pubs.usgs.gov/gip/msh/revision.html |
| URL (INDEX PAGE): | http://pubs.usgs.gov/gip/msh/title.html |
| Date Other: | Mon, 1 Jan 1990 00:00 -0600 |
| Publisher: | U.S. Geological Survey |
