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On 24 August 2014 at 10: 20: 44.06 UTC, a large earthquake struck the north San Francisco Bay region, approximately 10 km south-southwest of Napa, California, causing local damage in older wood frame and masonry buildings, road surfaces, sidewalks, and masonry wall structures (Bray et al., 2014). Using long-period (50–20 s) three-component, complete displacement records, the Berkeley Seismological Laboratory (BSL) estimated the scalar seismic moment at 1: 32× 1018 N· m for a depth of 11 km, corresponding to a moment magnitude of Mw 6.0. The strike/dip/rake from the seismic moment tensor solution was 155= 82=− 172, which is in overall agreement with the trends of structures comprising the West Napa fault system (Fig. 1). Geologic mapping revealed an approximately 14 km long surface rupture with 40–45 cm maximum observed slip on a complex multibranched fault system (Bray et al., 2014 …