(A) map of the region, showing the background seismicity and four mainshocks of specific interest in this study (white stars), whose focal mechanisms are indicated in (B). The four mainshocks are the following: i) the 2003 M6.5 San Simeon earthquake, ii) the 1966 M6 Parkfield mainshock, iii) the 2004 M6 Parkfield mainshock, and iv) the 1983 M6.8 Coalinga event. Focal mechanisms in B are provided by the United State Geological Survey (USGS).
(A) map of the region, showing the background seismicity and four mainshocks of specific interest in this study (white stars), whose focal mechanisms are indicated in (B). The four mainshocks are the following: i) the 2003 M6.5 San Simeon earthquake, ii) the 1966 M6 Parkfield mainshock, iii) the 2004 M6 Parkfield mainshock, and iv) the 1983 M6.8 Coalinga event. Focal mechanisms in B are provided by the United State Geological Survey (USGS).