Hi All. This is the latest data for the Rodgers Creek Fault. At this time it doesn’t appear that a large quake on the Hayward, or the Rodgers Creek is likely to trigger a quake at the same time on the other fault. However it isn’t impossible. Certain conditions would have to exist for this to happen. It all depends on what can’t be seen under San Pablo Bay. Take Care…Don in creepy town

“We studied the dilatational Hayward–Rodgers Creek fault step-over beneath San Pablo Bay with a variety of techniques to better understand fault geometry and mechanics.
We overlaid high-resolution seismic reflection data onto a tomographic seismic velocity model, yielding a structural cross section of the upper 2 km of the crust in south San
Pablo Bay. This section, when combined with sections across central and north San Pablo Bay (Wright and Smith, 1992), allows us to determine the southern extent of the Rodgers Creek fault and its closest approach to the Hayward fault ( 4 km). Thus an earthquake could feasibly jump the step-over, although only if both fault segments were in a state of high failure stress (Barka and Kandinsky-Cade, 1988; Harris, 1992; Harris and Day, 1993, 1999).”

“The Rodgers Creek fault dips away from the Hayward fault on all three structural cross sections in San Pablo Bay, and we conclude that the two faults probably do not join at
depth. Interpretation of aeromagnetic data in the region suggests that a transfer fault or other connecting strike-slip structure between the Hayward and Rodgers Creek faults is unlikely. The lack of such a structure implies that slip on the Hayward and Rodgers Creek faults should produce a pull apart basin in the step-over. Interpretation of filtered gravity data in the region demonstrates consistency with our fault map in that a relative gravity low appears to correlate with the area between the Hayward and Rodgers Creek faults.”

• Rodgers Creek Fault