EARTHQUAKES IN SOUTHERN CALIFORNIA, 1979-1989
Fault Trace across Lettuce Field, 1979 Imperial Valley Earthquake
Earthquake of October 15, 1979, Imperial Valley, California. A fault trace crosses a cultivated field near El Centro. The surface rupture on the Imperial Fault extended from about 2.5 miles (4 km) north of the International Border to about 2.5 miles south of Brawley. Maximum lateral displacement was about 22 inches (55 cm) in Heer Dunes and the maximum vertical displacement was 7.5 inches (19 cm) southeast of Brawley. Photograph Credit: Univ. of Colorado.