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The 1927 Lompoc, California earthquake

U.S. GEOLOGICAL SURVEY, MENLO PARK, CALIFORNIA 94025
COOPERATIVE INSTITUTE FOR RESEACH IN ENVIRONMENTAL SCIENCES UNIVERSITY OF COLORADO/NOAA, BOULDER, COLORADO 80309

Abstract

The Lompoc earthquake (M_S = 7.3) of November 4, 1927, which was originally located 80 km west of Point Arguello, has been relocated much closer to the coast of central California near Point Sal. P-wave arrival times at regional and teleseismic distances are used to determine the epicenter at 34.9°N, 120.7°W near the Hosgri fault, with a 52-km major axis for the 95 per cent confidence ellipse. This location is in close agreement with arrival times of several phases at seismographs located at Berkeley and Mount Hamilton. S-P time intervals from the first 36 hr of aftershocks recorded at Santa Barbara constrain the limits of the aftershock zone and support a near coastal location of the fault rupture.

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