West Napa Fault
The West Napa Fault is a 57 km (35 mi) long geologic fault in Napa County, California, believed to be the northern extension of the Calaveras Fault. It has been mapped as a late Pleistocene-Holocene active fault and is considered to be predominantly a right lateral strike-slip fault.[1] The fault was discovered in 1976 by Gene Boudreau, a ground water drilling specialist from Sebastopol.[2]
The West Napa Fault is a likely source for the magnitude 6.0 earthquake that hit Napa County on August 24, 2014.[3] Seismologists were not able to determine the exact fault on which the quake occurred, because faults are usually identified by their expression on the surface.[4] The epicenter for the 2000 Yountville earthquake which occurred on September 3, 2000 is also near the West Napa Fault.[5]
References
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