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Statistical methods for comparing directions to the orientations of focal mechanisms and Wadati-Benioff zones

INSTITUTE FOR GEOPHYSICS UNIVERSITY OF TEXAS AT AUSTIN, AUSTIN, TEXAS 78713
LOS ALAMOS NATIONAL LABORATORY, LOS ALAMOS, NEW MEXICO 87545

Abstract

We propose simple graphical methods for evaluating whether a set of direction vectors are clustered with respect to particular directions, axes, or planes. As examples of these techniques, we present data concerning the relationship between: (1) aftershock/initial event geometry and nodal planes of focal mechanisms; (2) aftershock/initial event geometry and the plane of the Wadati-Benioff zone; and (3) B axes of focal mechanisms and the plane of the Wadati-Benioff zone.

Footnotes

The present address of Raymond J. Willemann is: Ametek Computer Research Division, 610 N. Santa Anita Avenue, Arcadia, California 91106.