Imperial California Earthquake, October 1979
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Picture of 1979 California Earthquake

Imperial Fault trace 1 kilometer south of County Highway S-80 (11.3 kilometers northwest of the southeast end of the fault). Echelon fissures (vertically oriented) trend N. 20-50 degrees W. The fault trace trends between N. 30-40 degrees W. Compressional features (dark horizontal bands) join the ends of the separate echelon fractures. The distance between the manmade berms (wide dark diagonal bands) is about 9.1 meters. The maximum width of the obviously deformed zone is about 0.6 meter. View is south.

Picture of 1979 California Earthquake

Arcuate incipient-slump scarp with 13 centimeters of vertical separation in the embankment at site 33 east of River Park in Brawley. View is southeast.

Picture of 1979 California Earthquake

State Highway 86 bridge over the New River at site 32 west of Brawley. The abutment fill settled about 0.15 meter, and both ends of the bridge and riverbanks slumped about 0.1 meter toward the stream. Ground displacements caused the bridge decks to rotate about 0.3 degree counterclockwise in a horizontal plane, but did not seriously damage the structure.

Picture of 1979 California Earthquake

Imperial Fault at Harris Road site 67, which passes between the utility poles on the right. The sinuosity of the fault trace is typical of much of the northern segment of the Imperial Fault where the vertical component of the slip is large. Gullying of the upthrown (southwest) side of the fault has etched the rounded late Holocene scarp. Note the general, but imperfect, congruence of the new surface rupture (dark narrow line) with the base of the older escarpment. View is southwest.

Picture of 1979 California Earthquake

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.

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Credits: All earthquake photographs courtesy of the U.S. Geological Survey. YupRocks makes no copyright claims on these photographs; they are public domain and may be freely distributed.
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