M6 9 earthquake on the san joaquin fault south coast metro scec vdo
The San Joaquin Fault is a seismically active geological structure in the California Central Valley. East of the San Joaquin fault there is a flow pattern of alluvium that has been reported to be a mud flow. This flow pattern was deposited in the early Holocene or the late Pleistocene age.
References
San Joaquin Fault Wikipedia(Text) CC BY-SA