High‐resolution mapping of two large‐scale transpressional fault zones in the California Continental Borderland: Santa Cruz‐Catalina Ridge and Ferrelo faults
作者： Mark R. Legg , Monica D. Kohler , Natsumi Shintaku , Dayanthie S. Weeraratne
DOI: 10.1002/2014JF003322
关键词:
摘要: New mapping of two active transpressional fault zones in the California Continental Borderland, Santa Cruz-Catalina Ridge and Ferrelo fault, was carried out to characterize their geometries, using over 4500 line-km new multibeam bathymetry data collected 2010 combined with existing data. Faults identified from seafloor morphology were verified subsurface seismic reflection including single-channel multichannel profiles compiled past three decades. The systems are parallel capable large lateral offsets reverse slip during earthquakes. geometry shows evidence multiple segments that could experience throughgoing rupture distances exceeding 100 km. Published earthquake hypocenters regional seismicity studies further define depth extent historic ruptures. Historical recent focal mechanisms obtained first-motion moment tensor confirm strain partitioning dominated by right on major faults reverse-oblique adjacent structures. Transpression west northwest trending structures persists as far 270 km south Transverse Ranges; extension southern Borderland. A logjam model describes tectonic evolution crustal blocks bounded strike-slip which restrained displacement Ranges San Andreas big bend. Because potential for dip-slip rupture, may also be generating local tsunamis would impact Southern coastlines, populated regions Channel Islands.
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