Brawley Fault zone, Imperial Valley, California Earthquake. 1979.
Dates
Date Taken
1979
Summary
Imperial Valley, California, Earthquake October 15, 1979. Brawley Fault zone at Keystone Road site 100 (location shown on Plate 1, Professional paper 1254). The cracks in the pavement and in the field on the right follow the trace of the 1975 surface displacement. The dark vegetation just east of the trace formed an abrupt lineament at the fault trace before the earthquake; part of the darkness at the trace is due to low-sun shadowing of the scarp that faces west toward the camera. The fracturing near the crest of the scarp generally forms a single continuous break, although locally, multiple echelon fractures also occur on this fault strand. View is east-southeast. Photo by M.J. Rymer, October 23, 1979. Figure 107, U.S. Geological [...]
Summary
Imperial Valley, California, Earthquake October 15, 1979. Brawley Fault zone at Keystone Road site 100 (location shown on Plate 1, Professional paper 1254). The cracks in the pavement and in the field on the right follow the trace of the 1975 surface displacement. The dark vegetation just east of the trace formed an abrupt lineament at the fault trace before the earthquake; part of the darkness at the trace is due to low-sun shadowing of the scarp that faces west toward the camera. The fracturing near the crest of the scarp generally forms a single continuous break, although locally, multiple echelon fractures also occur on this fault strand. View is east-southeast. Photo by M.J. Rymer, October 23, 1979. Figure 107, U.S. Geological Survey Professional paper 1254.
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