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Mount St. Helens forms single crater. Skamania County, Washington. 1980.


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Caption: Mount St. Helens forms single crater. April 6, 1980 aerial view from the north of Mount St. Helens showing the single crater that was formed from the two separeate, smaller craters created in the mountain's summit crater. The violent eruption that occured on May 18, 1980 opened and extended the crater on the north side of the mountain from the 9,677-foot level to the 4,400-foot level with a force that was estimated to be the equivalent of 10-50 megatons of TNT or about as powerful as 600-2,500 of the atomic bombs dropped on Hiroshima at the end of WWII. The amount of ash and rock ejected by the volcano was estimated by USGS scientists to be about 1 cubic kilometer (1.3 billion cubic yards). In comparison, Mt. Vesuvius produced [...]


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U.S. Geological Survey

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Photo Number PIO_80_94b

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