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St. Helens

The gray layer behind the ruler was produced by the May 18, 1980 lateral blast of Mount St. Helens. The deposit is about 50 cm thick at this location 13 km NE of the volcano. The blast deposit is overlain by airfall pumice produced later on May 18, and underlain by a pumice deposit from an eruption in 1482 AD.

Type/Process: Pyroclastic Flow
Volcanic Status: Historical
Image Number: 028-092
Photographer: Lee Siebert, 1982 (Smithsonian Institution)
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