Diverse Pliocene-Quaternary tectonics in a transform environment, San Francisco Bay region, California

Geologic setting of the Yucaipa Quadrangle, San Bernardino and Riverside counties, California

“…In plan view, the fault pattern consists of short northwest-trending fault segments that pass into east-trending fault-like scarps. The latter probably are reverse faults, but we have not confirmed this speculation; in left-stepping right-lateral strike-slip fault zones, reverse dip-slip fault segments are typical (Aydin and Page, 1984;Christie-Blick and Biddle, 1985;Sylvester, 1988), and their occurrence in the Yucaipa quadrangle would be compatible with the apparent left-stepping geometry of the San Bemardino strand along this reach. Directly southeast of Spoor Canyon, stream gullies and other geomorphic features have been displaced right-laterally by the northwest-trending fault segments.…”

Breaks in Pavement and Pipes as Indicators of Range-Front Faulting Resulting from the 1989 Loma Prieta Earthquake near the Southwest Margin of the Santa Clara Valley, California

“…The expression ' strain partitioning" describes the occurrence of related subparallel faults and associated folds that together accommodate the strain generated at a plate boundary. The present boundary between the Pacific and North American plates is a complicated zone that exhibits both contractional and transverse deformation (McLaughlin, 1 974; Aydin and Page, 1984;Zoback and others, 1987) in response to oblique convergence across the plate boundary (Harbert and Cox, 1989) . As a result of the apparently negligible shear strength of the San Andreas fault system, the oblique strain in the lower crust or lithospheric mantle is partitioned upsection into nearly pure tangential and normal components of strain in the upper seismogenic crust (Zoback and others, 1987).…”

An analysis of the eastern margin of the Portland basin using gravity surveys

“…Orientations of structures associated with ends of strike-slip faults and stepovers between en echelon strike-slip faults (from Aydin and Page, 1984).…”