The S Wave Project for Focal Mechanism Studies. Earthquakes of 1963

Abstract
This is the second report of the S Wave Project, a routine program instituted for the determination of the focal mechanism of the larger earthquakes of each year using methods developed for the use of S waves in focal mechanism studies. In addition to the methods of data analysis described in detail in the previous report for earthquakes of 1962, in studying the earthquakes of 1963 use has also been made of a computer program. The program uses an error surface to search for the position of the axes of a double couple which gives the least standard deviation of the S wave polarization data. Seventy-two earthquakes of magnitude more than 6 1/4 occurred during 1963. Of these thirty-five earthquakes, so located as to afford a distribution of seismographic stations favorable for the use of S wave data, were selected for examination. Satisfactory focal mechanism solutions are here presented for twenty-six of these shocks. Tentative solutions are given for six, and no solution is advanced for the remaining three.

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