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St. Helens

The powerful lateral blast of May 18, 1980 at Mount St. Helens totally removed large standing trees near the volcano, leaving jagged stumps with splinters facing away from the volcano parallel to the direction of movement of the blast cloud. Warbonnet stumps, such as this one (about 2 m high) on Harry's Ridge 9 km north of the crater, are a common feature near the volcano; farther away trees were felled and left in place.

Type/Process: Pyroclastic Flow
Volcanic Status: Historical
Image Number: 028-069
Photographer: Lee Siebert, 1984 (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