USGS/Cascades Volcano Observatory, Vancouver, Washington DESCRIPTION: Western USA - Volcanic History and Historical Observations - Western USA Volcanoes
- Volcanic History
- Historical Observations
- Mount St. Helens, Washington
Western USA Volcanoes - [Map,20K,InlineGIF]
Map, Major West Coast Volcanoes - Washington, Oregon, and California Topinka, 1998, basemap created at University of Virginia, USGS Digital Line Graph Data Browser
- [Map,27K,InlineGIF]
Map, Potentially Active Volcanoes of the Western United States Modified from: Brantley, 1994, Volcanoes of the United States: USGS General Interest Publication
Volcanic History From: Wood and Kienle, 1990, Volcanoes of North America: United States and Canada: Cambridge University Press, 354p., p.146-148, Contribution by Charles A. Wood - The American West is one of the most unusual volcanic provinces on Earth. It is an extraordinary wide region of contemporaneous volcanism, stretching 1,800 kilometers (approximately 1,120 miles) from east of the Rocky Mountains to the west of the Cascades (103 degrees to 123 degrees West). It encompasses a very wide variety of volcanic landforms and diverse rock compositions, with the only consistency being small basalt fields that are scattered throughout the whole vast region. Intriguingly, except for the Cascadian segment, there is no currently active
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