Filters: Tags: USGS PIO Collection (X) > Types: Map Service (X) > partyWithName: Waitt, Richard B. (X)

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Aerial view of Mount St. Helens still erupting. Skamania County, Washington. 1980. Caption: Mount St. Helens bulge has expanded to 80 feet. April 7, 1980 aerial view from the northeast, of Mount St. Helens showing one of many small ash and steam eruptions that occurred between the first eruption on March 27, 1980 and the violent eruption on May 18, 1980. USGS scientists estimate that mid-May explosion occurred with the energy equivalent of 10-50 megatons of TNT or roughly the same force as 500-2,500 atomic bombs similar to that dropped on Hiroshima at the end of WWII. The force of the eruption blast leveled about 150 square miles of forestland to the northeast and northwest of the mountain. The volcano ejected an estimated 1 cubic kilometer of ash and rock (1.3 billion cubic yards) covering... Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Mount St. Helens Collection, Skamania County, Washington, USGS PIO Collection, Volcanoes, Waitt, R.B. Collection, All tags... aerial, photo print, Fewer tags