Constraints on temporal clustering of earthquakes, Eastern California Shear Zone

Department of Geological Sciences Research

Charlie Rubin, Scott LIndvall, Tom Rockwell

We are currently focusing on the strike-slip faults of the sastern California shear zone (ECSZ). It is an ideal natural l aboratory because of its recent seismicity, accessibility, excellent geologic exposure and availability of high quality seismic and geodetic data. Our goals are to characterize the temporal and spatial record of earthquake occurrence along major faults of the ECSZ. Our research is aimed at collecting paleoseismic data that will (1) enable us to better understand the apparent earthquake clustering observed in the ECSZ from our earlier research, (2) evaluate the repeatability of earthquake ruptures and segmentation within the ECFZ, and (3) assess the discrepancy between geodetic and geologic deformation rates using slip rates inferred from recurrence intervals determined from paleoseismic studies.

Addition Information on our Emerson fault studies.

Images from October field trip

Pinto Mountain fault

Looking southeast along the Pinto Mountain fault
Looking east along the Pinto Mountain fault,
Scott and Ana for scale
Looking east along the Pinto Mountain fault
Potential paleoseismic site
View to the south, eastern site
Pinto Mountain fault scarp
View to the south,
Ana for scale
Potential paleoseismic site
View to the south, western site
Pinto Mountain fault
Palms trees along fault zone

Blackwater fault

Folded Pleistocene basalt flow along
the Blackwater fault
Folded and faulted Neogene sandstone
along the Blackwater fault

Lenwood fault

Looking southeast along the Lenwood scarp
Lenwood fault scarp,
Scott and Charlie in discussion
Looking south