Mount St. Helens; aerial view of upper cone, looking west-southwest. Skamania County, Washington. 1980.

Album caption: 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, Wash. Skamania County, Washington. March 24, 1980. (Photo by David Frank) Published as figure 17 in U.S. Geological Survey. Professional paper 1250. 1981. Index card unavailable.