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St. Helens

Pumice fragments from the May 18, 1980 eruption form a broad plain below Mount St. Helens in this May 23 photo. Pumiceous pyroclastic flows on May 18 traveled 8 km from the crater of Mount St. Helens to as far as Spirit Lake. A geologist can be seen holding a large, light-weight block of pumice. In addition to May 18, pumiceous pyroclastic flows were erupted on May 25, June 12, July 22, August 7, and October 16-18, 1980.

Type/Process: Pyroclastic Flow
Volcanic Status: Historical
Image Number: 029-002
Photographer: Dan Miller, 1980 (U.S. Geological Survey)
Summit Elevation: 2549 meters
Latitude/Longitude: 46.20 N / 122.18 W
Timeframe: Last known eruption 1964 or later
Region: Canada and Western USA


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Smithsonian National Museum of Natural History Department of Mineral Sciences website Credits