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Rapid source-mechanism analysis of the April 29, 1993 cataract Creek (M_w = 5.3), northern Arizona earthquake

Institute of Tectonics University of California, Santa Cruz, Santa Cruz, California 95064
Department of Geosciences University of Arizona, Tucson, Arizona 85721

Abstract

The source mechanism of two moderate-size normal-faulting earthquakes located slightly south of the Grand Canyon in Arizona are studied, using several near real-time seismic-wave analysis procedures. The events are found to have source depths near 10 to 15 km, and the smaller of the two events (m_b = 4.8) is used to provide Empirical Green's Functions to analyze the rupture directivity of the larger (M_w = 5.3) mainshock. These events indicate complexity in the crustal stress environment on the western margin of the Colorado Plateau.

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