See more from this Division: Topical Sessions
See more from this Session: Coastal Tectonics of the Pacific Rim: Geomorphology, Structure, and Hazards
Abstract:
In spring 2008, a new high-resolution seismic reflection survey was conducted in the area between the PV and CB faults. North of Lasuen Knoll, the PV fault zone is well defined in seismic reflection profiles, with 1 or 2 straight strands showing seafloor offset, and new high-resolution bathymetry reveals a pronounced bathymetric scarp traceable for at least 9 km. Instead of continuing to the south to join the CB fault, however, the PV fault appears to end southwest of Lasuen Knoll, where it splits into numerous branches that become progressively buried southwards under at least 50 m of undeformed sediment. The northernmost well-defined active strands of the CB fault are about 25 km south of the southernmost active strands of the PV fault zone. Typical sedimentation rates for the inner borderland of southern California indicate that the most recent offset on buried faults in the area between the PV and CB faults occurred at least 15 to 50 thousand years ago. Thus, there appears to be no active connection between the PV and CB fault zones.
See more from this Division: Topical Sessions
See more from this Session: Coastal Tectonics of the Pacific Rim: Geomorphology, Structure, and Hazards