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Brawley Fault zone, Imperial Valley, California Earthquake. 1979.

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...

Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: 1979 Imperial Valley California Earthquake Collection, Earthquakes, Johnson, C.E. Collection, Photographers, photo print

Arcuate incipient-slump scarp. Imperial Valley, California Earthquake. 1979.

Imperial Valley, California, Earthquake October 15, 1979. Arcuate incipient-slump scarp with 13 centimeters of vertical separation in the embankment at site 33 east of River Park in Brawley (location shown on Plate 1, professional paper 1254). View is southeast. Photo by T.L. Youd. Figure 182, U.S. Geological Survey Professional paper 1254.

Slump and cracks in River Park. Imperial Valley, California, Earthquake. 1979.

Imperial Valley, California, Earthquake October 15, 1979. Slump and cracks at site 34 in River Park in Brawley (location shown on Plate 1, professional paper 1254). The slump near the New River shows 1 meter of vertical displacement. View is north. Photo by T.L. Youd. Figure 183-A, U.S. Geological Survey Professional paper 1254.

Displacements, fissures, and sand boils. Imperial Valley, California Earthquake. 1979.

Imperial Valley, California, Earthquake October 15, 1979. Lateral spread at site 13 on Heber Road (location shown on Plate 1, Professional paper 1254), showing associated displacements, fissures, and sand boils. Sand boils, ground cracks, and displaced road and canal on the lateral spread. View is east. Photo by P. Noden. Figure 163-C, U.S. Geological Survey Professional paper 1254.

Northern branch of the Imperial Fault, Imperial Valley, California, Earthquake. 1979.

Imperial Valley, California, Earthquake October 15, 1979. Northern branch of the Imperial Fault 0.3 kilometer north of Keystone Road site 86 (location shown on Plate 1, Professional paper 1254). Of the three breaks at Keystone Road, this was the only strand of the Imperial Fault that extended away from the pavement. The sinuous surface rupture is made up of left-stepping echelon breaks. Vertical displacement (far side up) of 3 centimeters was measured near the lower right corner on October 21, 1979. The rupture formed a single line of fractures. Two dark bands paralleling the trace are post-earthquake footpaths worn by curious geologists and other visitors. The plow lines in the field are spaced at 3.7-meter intervals....

Brawley Fault zone trace. Imperial Valley, California Earthquake. 1979.

Imperial Valley, California, Earthquake October 15, 1979. Concrete canal liner on the north side of Keystone Road on the trace of one strand within the Brawley Fault zone. About 7 centimeters of right-lateral misalignment of the left side of the canal was measured on October 21, 1979. This canal liner had been checked on a nearly annual basis since February 1975 for evidence of horizontal offset. When last checked on January 17, 1979, the liner showed no obvious right-lateral displacement. View is east. Photo by R.V. Sharp. Figure 157, U.S. Geological Survey Professional paper 1254.

Differential settlement and an incipient slump near a box culvert. All American Canal, Imperial Valley, California Earthquake. 1979.

Imperial Valley, California, Earthquake October 15, 1979. Differential settlement and an incipient slump near a box culvert through the embankment of the All American Canal at site 26 (location shown on Plate 1, Professional paper 1254). View is south. Photo by T.L. Youd. Figure 173, U.S. Geological Survey Professional paper 1254.

Displacements, fissures, and sand boils. Imperial Valley, California Earthquake. 1979.

Imperial Valley, California, Earthquake October 15, 1979. Lateral spread at site 13 on Heber Road (location shown on Plate 1, Professional paper 1254), showing associated displacements, fissures, and sand boils. An unlined canal shifted about 1.2 meters to the south. View is west. Photo by T.L. Youd. Figure 163-A, U.S. Geological Survey Professional paper 1254.

Ground-failure effects. Imperial Valley, California Earthquake. 1979.

Imperial Valley, California, Earthquake October 15, 1979. Ground-failure effects at site 17 near the intersection of King Road and Orchard Road (location shown on Plate 1, Professional paper 1254). A broken canal lining near the west end of the disturbed zone is approximately 1 meter high. Photo by T.L. Youd. Figure 166-C, U.S. Geological Survey Professional paper 1254.

Imperial Fault trace, Imperial Valley, California Earthquake. 1979.

Imperial Valley, California, Earthquake October 15, 1979. Imperial Fault trace west of Anderholt Road in alfalfa fields as it appeared shortly after the earthquake of May 18, 1940. Unpaved Anderholt Road cuts diagonally across the upper right. The dark band west of and parallel to the road is Ash Lateral 15 canal. Photo by R.V. Sharp, 1940. Figure 154-A, U.S. Geological Survey Professional paper 1254. See also photo jce00024.

Displacements, fissures, and sand boils. Imperial Valley, California Earthquake. 1979.

Imperial Valley, California, Earthquake October 15, 1979. Lateral spread at site 13 on Heber Road (location shown on Plate 1, Professional paper 1254), showing associated displacements, fissures, and sand boils. The pavement on Heber Road settled, cracked, and shifted to the south by as much as 1.2 meters. View is east. Photo by T.L. Youd. Figure 163-B, U.S. Geological Survey Professional paper 1254.

Cut slope in Devils Canyon. Imperial Valley, California Earthquake. 1979.

Imperial Valley, California, Earthquake October 15, 1979. Cut slope at site 38 in Devils Canyon (location shown on Plate 1, Professional paper 1254) from which small rockslides fell during the earthquake. Debris fell from the fresh scarps above. Photo by T.L. Youd. Figure 185-A, U.S. Geological Survey Professional paper 1254.

Line of sand boils. Imperial Valley, California Earthquake. 1979.

Imperial Valley, California, Earthquake October 15, 1979. Line of sand boils at site 11 (location shown on Plate 1, Professional paper 1254) in a field about 1 kilometer north of Bonds Corner. The spacing between sand boils is as much as tens of meters. Some small fissures are associated with individual sand boils, but no fissures are through-going. View is north. Photo by T.L. Youd. Figure 161, U.S. Geological Survey Professional paper 1254.

Imperial Fault. Imperial Valley, California Earthquake. 1979.

Imperial Valley, California, Earthquake October 15, 1979. Imperial Fault at Interstate Highway 8 site 15 (location shown on Plate 1, Professional paper 1254). The main fault trace, marked by offset rows of asparagus in the foreground, dies out southeastward in the field beyond the highway. The subsidiary branching fault that crosses this field northwestward to the highway probably joins the main fault near the palms in the foreground. View is southeast. Photo by M.J. Rymer, December 12, 1979. Figure 91, U.S. Geological Survey Professional paper 1254.

Flow laminations in a sandblow dike. Imperial Valley, California, Earthquake. 1979.

Imperial Valley, California, Earthquake October 15, 1979. Flow laminations in a sandblow dike. Note the truncated dark layers along the margins. Photo by S.G. Muir. Figure 191, U.S. Geological Survey Professional paper 1254.

Imperial County Services Building in El Centro. Imperial Valley, California Earthquake. 1979.

Imperial Valley, California, Earthquake October 15, 1979. Imperial County Services Building in El Centro. View is north. Photo by C. Rojahn. Figure 243, U.S. Geological Survey Professional paper 1254.

Damage to the Imperial County Services Building. Imperial Valley, California Earthquake. 1979.

Imperial Valley, California, Earthquake October 15, 1979. One of four damaged reinforced-concrete columns along the east end of the Imperial County Services Building between the ground and second floors. The damage to the other three columns was similar. Photo by C. Rojahn. Figure 245, U.S. Geological Survey Professional paper 1254.

Imperial Fault, Imperial Valley, California Earthquake. 1979.

Imperial Valley, California, Earthquake October 15, 1979. Main branch of the Imperial Fault (29.2 kilometers northwest of the southeast end of the fault), 0.4 to 0.8 kilometer north of Carey Road. The surface break is the dark line at the base of the low, slightly gullied scarp in the foreground. The trace generally follows the curved edge of the cultivated field in the distance and converges with the curved concrete canal liner at the top. View is northeast. Figure 97, U.S. Geological Survey Professional paper 1254.

Rupture (or "mole track") on the Imperial Fault. Imperial Valley, California, Earthquake. 1979.

Imperial Valley, California, Earthquake October 15, 1979. Rupture (or "mole track") on the Imperial Fault in a field south of Heber Road (2.4 kilometers northwest of the southeast end of the fault). Piled-up soil fragments are compressional mounds that formed between the ends of echelon fractures in the ground. View is northwest. J.C. Tinsley measured 45 degrees and 3 centimeters of dextral displacement on offset crop rows in this field. Photo by J.C. Tinsley, October 17, 1979. Figure 86, U.S. Geological Survey Professional paper 1254.

Ground-failure effects. Imperial Valley, California Earthquake. 1979.

Imperial Valley, California, Earthquake October 15, 1979. Ground-failure effects at site 17 near the intersection of King Road and Orchard Road (location shown on Plate 1, Professional paper 1254). Overlapped canal lining near the east end of the disturbed zone. Note the sand boil on the bottom of the canal. Photo by T.L. Youd. Figure 166-D, U.S. Geological Survey Professional paper 1254.