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Seismological Implications of the Ground Motion Data from the 2003 San Simeon Earthquake

by Vladimir Graizer and Douglas Dreger

Graizer, Vladimir, and Douglas Dreger (2004). Seismological Implications of the Ground Motion Data from the 2003 San Simeon Earthquake. SMIP04 Seminar on Utilization of Strong-Motion Data, p. 25 - 40.

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Abstract

The San Simeon earthquake occurred on a previously unknown blind thrust fault. No surface rupture associated with the earthquake has been identified. It was recorded at more than 100 strong motion stations out to distances of over 300 km with relatively few stations at less than 50 km distance. The biggest acceleration of 0.48 g was recorded at the Templeton hospital 38 km SE of the epicenter. Data demonstrates strong directivity effect in the direction of rupture propagation. Combined inversion of GPS and seismic waveform data allowed constructing a finite-source model of the earthquake.