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 (mb = 4.8) is used to provide Empirical Green's Functions to analyze the rupture directivity of the larger (Mw = 5.3) mainshock. These events indicate complexity in the crustal stress environment on the western margin of the Colorado Plateau.

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