The San Andreas fault system, bounding the North American and Pacific plates, dominates the present tectonics of California (Atwater, 1970, 1989). Detailed knowledge of neotectonic events is critical for understanding seismic hazards in active settings such as the Los Angeles area (Fig. 1A) (e.g., Dolan et al., 1997; Yeats et al., 1997). Less obvious is the importance of precursor events (paleotectonics) in creating the three-dimensional architecture of the surface and subsurface, within which recent events are expressed. Intense study of neotectonics has resulted in detailed models for the kinematics of active fault systems in southern California (e.g.
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