Hi Steve. The Concord/Green Valley Fault located SE of the Rodgers Creek Fault is listed as have a slip rate of 6mm per year. However I don’t know if this applies to the whole fault, or to a segment that is slipping. The fault starts at 37.89N/121.98W and ends at 38.45N/122.20W for a length of 66km with a width of 12km. It is thought to able to have a quake up to M>6.9.

Although the overall zone is highly complex and includes some significant active secondary traces such as the Cordelia fault most feel that the Concord-Green Valley fault zone is likely to fail in one major event, but a few were concerned that a stepover capable of stopping ruptures might exist under Suisun Bay. A single event is thought to occur about every 180 yrs. Take Care…Don in creepy town