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Focal mechanism of the Prince William Sound, Alaska earthquake of March 28, 1964

GEOPHYSICS RESEARCH GROUP COAST AND GEODETIC SURVEY ENVIRONMENTAL SCIENCE SERVICES ADMINISTRATION, ROCKVILLE, MARYLAND 20852

Abstract

Two nodal planes for P were determined using a combination of P-wave first motion and S-wave polarization data and from S-wave data alone. The S-wave polarization error, , is slightly lower for a type Il than for a type I mechanism. The type I mechanism solution indicates a predominately dip-slip faulting on a steeply dipping plane. The preferred solution is a type II mechanism with the following P nodal planes: strike N62°E, dip 82°S, (a plane); strike N22°W, dip 52°W, (b plane). Two solutions are possible: right lateral faulting which strikes northeast; or, left lateral faulting which strikes northwest. Both possible fault planes dip steeply.

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