Volcano Hazards Program

U.S. Geological Survey
Fact Sheet 165-97
Version 1.1

Living With Volcanic Risk in the Cascades

By Dan Dzurisin, Peter H. Stauffer, and James W. Hendley II

1997, revised 2008

screenshot of first page showing Mount Rainer towering over cityscape on Puget Sound and a scientist on a volcano with a tripod-mounted instrument as a helicopter approaches

The Cascade Range of the Pacific Northwest has more than a dozen potentially active volcanoes. Cascade volcanoes tend to erupt explosively, and on average two eruptions occur per century—the most recent were at Mount St. Helens, Washington (1980–86 and 2004–8), and Lassen Peak, California (1914–17). To help protect the Pacific Northwest’s rapidly expanding population, USGS scientists at the Cascades Volcano Observatory in Vancouver, Washington, monitor and assess the hazards posed by the region’s volcanoes.

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For questions about the content of this report, contact Cascade Volcano Observtory

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