A program for the location of hypocenters of local shocks by means of an electronic digital computer is described. The P times are corrected for variations in crustal structure to get precision in the determination of depth. An estimate of the accuracy of the method is given for some particular cases. Application of the program to the Kern County series of aftershocks, provides a clearer picture of tectonic mechanism of the White Wolf fault. A future extension of the program to process and correct data automatically is also described.

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