U.S. Geological Survey Photographic Library

ID. Mount St. Helens - PP 1250 9

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$Aerial view of upper cone, looking west-southwest. Although seismic activity began under Mount St. Helens on March 20, this overflight showed no unusual features except numerous tracks of earthquake-triggered snow avalanches. No evidence of fracturing of summit area was detected during careful visual observations on the afternoon of March 24, 1980. On March 25, the first cracks were noted by Bud Kimball, Tacoma, Washington. Photo by David Frank. Skamania County, Washington. March 24, 1980. Figure 17, U.S. Geological Survey Professional paper 1250.$

Aerial view of upper cone, looking west-southwest. Although seismic activity began under Mount St. Helens on March 20, this overflight showed no unusual features except numerous tracks of earthquake-triggered snow avalanches. No evidence of fracturing of summit area was detected during careful visual observations on the afternoon of March 24, 1980. On March 25, the first cracks were noted by Bud Kimball, Tacoma, Washington. Photo by David Frank. Skamania County, Washington. March 24, 1980. Figure 17, U.S. Geological Survey Professional paper 1250.

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