Global Positioning System Tracking of Fault Slip Rates within a Transect across the Pacific-North America Plate Boundary, Near Brawley, California

Event Center A & B

Using benchmarks within the Brawley transect, possible slip rate combinations were determined for seven faults along the North American and Pacific Plate boundary. Three models were tested for best possible slip rate and locking depth combinations, thus calculating the best fit scenario. Of the three models tested, the best fit was graphed and enveloped to show a housing with the acceptable range predictions that concur with observed benchmark velocities. The models that were considered acceptable contained the following slip rates: 8-14 mm/yr, respectively, for the San Jacinto fault. The best fitting model for the Brawley seismic zone had 12 mm/yr (with a shallow locking depth of 1 km) and the Lake Elsinore Fault and the San Miguel Fault having slip rates of 2 mm/yr.