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Geodetic constraints on the 2014 M 6.0 South Napa earthquake

March 1, 2015

On 24 August 2014, the M 6.0 South Napa earthquake shook much of the San Francisco Bay area, leading to significant damage in the Napa Valley. The earthquake occurred in the vicinity of the West Napa fault (122.313° W, 38.22° N, 11.3 km), a mapped structure located between the Rodger’s Creek and Green Valley faults, with nearly pure right‐lateral strike‐slip motion (strike 157°, dip 77°, rake –169°; http://comcat.cr.usgs.gov/earthquakes/eventpage/nc72282711#summary, last accessed December 2014) (Fig. 1). The West Napa fault previously experienced an M 5 strike‐slip event in 2000 but otherwise exhibited no previous definitive evidence of historic earthquake rupture (Rodgers et al., 2008; Wesling and Hanson, 2008). Evans et al. (2012) found slip rates of ∼9.5  mm/yr along the West Napa fault, with most slip rate models for the Bay area placing higher slip rates and greater earthquake potential on the Rodger’s Creek and Green Valley faults, respectively (e.g., Savage et al., 1999; d’Alessio et al., 2005; Funning et al., 2007).

Citation Information

Publication Year 2014
Title Geodetic constraints on the 2014 M 6.0 South Napa earthquake
DOI 10.1785/0220140210
Authors William D. Barnhart, Jessica R. Murray, S H Yun, Jerry L. Svarc, SV Samsonov, EJ Fielding, Benjamin A. Brooks, Pietro Milillo
Publication Type Article
Publication Subtype Journal Article
Series Title Seismological Research Letters
Series Number
Index ID 70136079
Record Source USGS Publications Warehouse
USGS Organization Geologic Hazards Science Center

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