Accession Number : AD0615621

Title :   STATISTICAL EVALUATION OF THE FOCAL MECHANISM SOLUTIONS FOR THIRTY-SIX 1962 EARTHQUAKES,

Corporate Author : SAINT LOUIS UNIV MO

Personal Author(s) : Bollinger,G. A. ; Stauder,William

Report Date : 1964

Pagination or Media Count : 20

Abstract : The S Wave Project for Focal Mechanism Studies recently completed a study of thirty-six of the larger magnitude earthquakes that occurred during 1962. Welldetermined solutions employing a double-couple model were obtained for twenty-three of these shocks and tentative solutions for the remaining thirteen. This study attempts to specify the agreement between the observed data (direction of first motion of the P wave and polarization angle of the S wave) and the theoretical values of these data as implied by the focal mechanism solutions obtained. To describe the agreement between observed and theoretical P wave patterns, a P Wave Agreement Factor (PAF) is defined and applied to each of the well-determined focal mechanism solutions. The PAF, with a range of zero to four, attempts to specify both the adequacy and consistency of the P wave data by accounting for the number of quadrants of data and by weighting each data point with respect to its distance from nodal lines.

Descriptors :   (*EARTHQUAKES, STATISTICAL DATA), (*SEISMIC WAVES, PROPAGATION), STATISTICAL PROCESSES, SEISMOLOGY

Distribution Statement : APPROVED FOR PUBLIC RELEASE