Figure 1. Seismicity map of research area. Fault lines (thin grey lines) are obtained from USGS, and event locations (grey circles) follow the double-difference catalog by Waldhauser and Schaff (2008). The HRSN stations (green triangles) and the SAFOD (San Andreas Fault Observatory at Depth) locations are obtained from NSCN (Northern California Seismic Network). The two yellow circles indicate the locations of the 1966 and 2004 M6 earthquakes. The black solid line indicates the study area from 0 to 80 km along strike.