Crater Lake Geology. and the Mt. Mazama Story. Crater Lake: Cascade Volcanic Arc. Crater Lake is part of the Cascade Volcanic Arc that runs roughly N-S from Northern California up into British Columbia. The Cascade Volcanic arc is produced by the subduction of several oceanic plates.
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and the Mt. Mazama Story
Above: The cataclysmic eruption of Mount Mazama 7,700 years ago, as depicted in this painting by Paul Rockwood (image courtesy of Crater Lake Natural History Association).
Left: Mt. Rainier, WA courtesy of USGShttp://vulcan.wr.usgs.gov/Volcanoes/Rainier/Locale/framework.html
Stratovolcano:Volcano composed of alternating layers, of lava and pyroclastic flows.
Shield Volcano: Large volcanic structure with gentle slopes built up almost entirely from fluid lava flows.
Figures modified from diagrams on back of 1988 USGS map “Crater Lake National Park and Vicinity, Oregon.”http://pubs.usgs.gov/fs/2002/fs092-02/
Taken by Sara Auer Perry