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Fact Sheet 173–98

Notice: This USGS Publication has been superseded by Fact Sheet 2014-3119

Produced in cooperation with the National Park Service, Lassen Association, and the U.S. Forest Service

Eruptions of Lassen Peak, California, 1914 to 1917

By Michael A. Clynne, Robert L. Christiansen, Tracey J. Felger, Peter H. Stauffer, and James W. Hendley II

Thumbnail of and link to report PDF (588 kB)Abstract

On May 22, 1915, an explosive eruption at Lassen Peak, California, the southernmost active volcano in the Cascade Range, devastated nearby areas and rained volcanic ash as far away as 200 miles to the east. This explosion was the most powerful in a 1914–17 series of eruptions that were the last to occur in the Cascades before the 1980 eruption of Mount St. Helens, Washington. Recent work by scientists with the U.S. Geological Survey (USGS) in cooperation with the National Park Service is shedding new light on these eruptions.

First posted January 20, 2001

Related Fact Sheets

See a list of other volcano-related fact sheets published by the U.S. Geological Survey 

For additional information, contact:
California Volcano Observatory
U.S. Geological Survey
345 Middlefield Road
Menlo Park, CA 94025

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Suggested citation:

Clynne, Michael A., Christiansen, Robert L., Felger, Tracey J., Stauffer, Peter H., Hendley, James W., 1999, Eruptions of Lassen Peak, California, 1914 to 1917: U.S. Geological Survey Fact Sheet 173-98, 2 p.,

ISSN 2327-6932 (online)


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