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Pumiceous ash flow of August 7 eruption of Mount St. Helens, viewed from Coldwater Ridge, 8 km north of volcano.

Dates

Date Taken
1980

Summary

Pumiceous ash flow of August 7 eruption of Mount St. Helens, viewed from Coldwater Ridge, 8 km north of volcano. The fully developed ash flow was moving down lower north flank and across pumice plain at about 1629 PDT. Speeds in excess of 100 km/hr were measured from carefully timed 35-mm still photographs and from 16-mm motion pictures. Ash cloud rises above the basal pyroclastic flow Main Plinian column is the higher, more diffuse cloud in background. Skamania County, Washington. August 7, 1980. Figure 15 and Figure 293-C, U.S. Geological Survey Professional paper 1250.

Contacts

Data Owner :
U.S. Geological Survey

Attached Files

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mcpp0007.jpg thumbnail 8.81 MB image/jpeg

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Additional Information

Identifiers

Type Scheme Key
name photoLibrary mcpp0007
number photoLibrary 26858
batch photoLibrary btch138
number_in_book photoLibrary 7cp

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