Fact Sheet 173–98
Notice: This USGS Publication has been superseded by Fact Sheet 2014-3119
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
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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., https://pubs.usgs.gov/fs/1998/fs173-98/.
ISSN 2327-6932 (online)