Thermal infrared images of Mount St. Helens summit area obtained by U.S. Army on March 30. Skamania County, Washington. 1980.

Album caption: Thermal infrared images of Mount St. Helens summit area obtained by U.S. Army at approximately 2300 on March 30, 1980. Thermal feature E is a topographic prominence and may result from solar heating. There are large-scale distortions in these images. B. View of upper north flank showing heating within major fractures near The Boot (fracture D and fracture through area A). In this image, observations near The Boot were approximately perpendicular to the local surface. Skamania County, Washington. March 30, 1980. (Indicator lines, arrow and letters on published photo only) Portion published as figure 151-B in U.S. Geological Survey. Professional paper 1250. 1981. Index card unavailable.