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Aerial view of ash-laden Mount St. Helens from the northwest showing the two craters formed initial eruption. Skamania County, Washington. 1980.


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Caption: Mount St. Helens forms two craters. March 31 aerial view of the ash-laden Mount St. Helens showing the two craters formed after the initial eruption on March 27. The craters measure approximately 300' x 450' and 90' x 150' and were contained in the original summit crater prior to the largest eruption on May 18. Unlike the relatively mild earlier eruption, the May 18 event was violent and destructive. Over 5,000 feet of the upper north flank of the mountain was opened up by the force of the explosion, which was termed comparable to the energy output of 10-50 megatons of TNT--about 500-2,500 times more powerful than the atomic blast at Hiroshima at the end of WWII. The ash and rock ejected by the volcano was estimated by USGS [...]


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U.S. Geological Survey

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Available in the U.S. Geological Survey Denver Library Photographic Collection, 2010 DENPH0011, PIO Collection.


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Photo Number PIO_80_96d

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