The largest earthquake to hit California in more than 15 years occurred at 02:28:58.9 GCT on 9 April 1968 near Borrego Mountain, on the western edge of Imperial Valley. The Seismological Laboratory at Pasadena has tentatively the shock a magnitude of 6.5, an epicentral location of 33 ° 08.8' N, 116 ° 07.5' W, and a focal depth of 20 km. The earthquake was felt throughout most southern California and adjacent areas, but the absence of severe damage and was in large part due to the relatively undeveloped nature of the epicentral . Indeed, it would have been difficult to pick a location in the southernmost of the State more remote from centers of population.
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Allen et al. (1968) studied this question.
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