The distorition between 1924 and 1957 of a geodetic quadrilateral near the epicenter of the 1927 Lompoc, California earthquake provides some constraints upon the source mechanism of that earthquake. The distortion is not consistent with right-lateral slip on the Hosgri fault, but rather suggests thrust faulting on a northerly striking fault. However, the measured distorition is only marginally significant and could possibly be produced by an unidentified systematic bias.

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