Abundant off-fault seismicity and orthogonal structures in the San Jacinto fault zone.

ABSTRACT: The trifurcation area of the San Jacinto fault zone has produced more than 10% of all earthquakes in southern California since 2000, including the June 2016 M_w (moment magnitude) 5.2 Borrego Springs earthquake. In this area, the fault splits into three subparallel strands and is associated with broad V_P /V_S anomalies. We synthesize spatiotemporal properties of historical background seismicity and aftershocks of the June 2016 event. A template matching technique is used to detect and locate more than 23,000 aftershocks, which illuminate highly complex active fault structures in conjunction with a high-resolution regional catalog. The hypocenters form dipping seismicity lineations both along strike and nearly orthogonal to t

SUBMITTER: Ross ZE 

PROVIDER: S-EPMC5351979 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature