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Focal mechanism of couples without moment

DOMINION OBSERVATORY, OTTAWA, Canada

Abstract

The equations for the displacement of a homogeneous medium due to a system of three couples without moment are simplified when two of the couples are equal. In this case the plane of the S wave passes through a fixed line. Equivalently, in the projection on the antipodal tangent plane the direction of S passes through a fixed point. The ratio of the magnitude of the equal couples to the magnitude of the third couple may be found.

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