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Using P‐and S‐wave arrival times with the laterally varying P‐wave velocity structure derived from analysis of a refraction survey of the Imperial Valley, a hypocenter is ascertained for the October 15, 1979, Imperial Valley earthquake: Latitude 32° 39.50′N,Longitude 115° 19.80′W,Depth 8.0 km,Time 23:16:54.40 GMT.
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Ralph J. Archuleta (1982) studied this question.
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