Accordingly, we interpret the estimates of z u as a map of the position of a slip front—either coseismic or postseismic—that propagated on an extant fault plane. The West Napa Fault has identified to have the potential capacity to generate a 6.8 to 7.1 magnitude earthquake (Napa County, BDR, 2005). The whole zone is about 70 km (44 mi) wide. Most Popular on TIME… Napa lies exactly in the axis - or "along the strike" as seismologists call it - of the West Napa Fault, the assumed origin of Sunday's quake. The 2014 Mw 6.0 South Napa earthquake occurred on the West Napa Fault Zone (WNFZ) and caused damage in and around the City of Napa. The M=6.0 earthquake injured 120 people, three critically, and caused localized damage in Napa Valley. The West Napa fault passes through the Napa Valley and cuts through 2 km of late Pleistocene to Quaternary aged sediments under the valley floor (Wesling and Hanson, 2008; Brocher et al., 2015). The West Napa Fault is a 57 km (35 mi) long geologic fault in Napa County, in the North Bay region of the San Francisco Bay Area in northern California.It is believed to be the northern extension of the Calaveras Fault in the East Bay region.. Helley and Herd (1977 #509) first named the northwest to north northwest-striking zone of predominantly dextral slip faults the West Napa fault zone. The most common usage in recent literature is West Napa fault. https://www.livescience.com/47531-what-caused-napa-earthquake.html Linking Faults in Napa Valley and Beyond. This was a shallow-focus … But there is also another factor during the earthquake which can determine the zones of damage, that is the direction of the rupture itself. Pampeyan (1979 #1245) referred to this fault zone as the Napa fault. Once these shocks are properly recorded and analyzed, it will be seen if the USGS was correct to initially assign the quake to the widely unknown West Napa Fault. This earthquake nucleated ~11km beneath Napa Valley on or near the West Napa fault, which is itself one a series of subparallel right-lateral strike-slip faults that comprise the San Andreas fault system. In October 2016, we acquired high-resolution P- and S-wave seismic data along a 120-m-long, SW-NE-trending profile in Napa, California. We separately acquired P- and S-wave data at every station using multiple hammer hits, which were edited and stacked into individual shot gathers in the lab. There's a couple of faults there: the West Napa and Carneros-Franklin faults. West Napa fault, Browns Valley section (Class A) No. by Dr. Wendy Bohon. Today's earthquake was between a pair of active fault systems, the Hayward-Rodgers Creek Fault system and the Concord-Green Valley Fault system. The West Napa Fault and its branches were first mapped by Weaver (1949), and subsequent work extended from the 1970's into the 1990's (references in the article cited). Parts of the West Napa Fault Zone ruptured during the Aug. 24, 2014 South Napa earthquake, they said. The relative motion on this fault is not well known but thought to be about 1 mm/yr (0.04 in/yr). Diablo, Rodgers Creek, San Andreas, San Gregorio, and West Napa faults. In November 2016, the U.S. Geological Survey acquired high-resolution P- and S-wave seismic data across the surface trace of the West Napa Fault zone at Saintsbury Winery in Napa, California. The West Napa fault extends along the western margin of the basin that underlies much of Napa Valley. The West Napa Fault runs between the valleys on the eastern edge of the mountains. The fault zone that ruptured in the South Napa earthquake had been previously recognized as a strand of the West Napa Fault zone . It clearly confirms that part of the West Napa Fault system was responsible for the 6.0 earthquake that rocked California’s wine-producing region. As noted in Table 4.10-3, there are four faults (West Napa, Hunting Creek, Green Valley and Cordelia) that are of concern to Napa County. Many faults zoned in this area were identified by … The West Napa fault was more completely mapped by Fox and others (1973 #5253). The West Napa fault system is a relatively minor strike-slip fault in the Contra Costa shear zone, which transfers slip be-tweentheNorthernCalaveras,WestNapa,andConcordfaults (Unruh and Kelson, 2002a,b; Kelson et al., 2004, 2005; Wes-ling and Hanson, 2008; Brossyet al., 2010). The epicenter of the 2000 M L 5.2 Yountville earthquake occurred 5 km west of the surface trace of the West Napa Fault as defined by Helley and Herd (1977), and thus the source of the earthquake was assigned to an unmapped fault. This early work reported that the fault and its branches extend 30-35 km along the western margin of the Valley; the Wesling and Hanson report suggests that the fault is 57 km long, extending from Carquinez Strait … A new order from President Trump is racist, says the head of a local agency that intends to defy it 36a Last Review Date: 2000-06-07 ... Bryant, W.A., 1982, West Napa fault zone and Soda Creek (East Napa) fault, Napa County: California Division of Mines and Geology Fault Evaluation Report FER-129, microfiche copy in Division of Mines and Geology Open-File Report 90-10, 18 p., scale 1:24,000. 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 north-northwest-striking West Napa Fault is mapped along the western margin of Napa Valley, California. Mapping the exact location of the aftershocks in three dimensions will yield a picture of the actual fault plane underground. Napa Valley quake . The causative fault of the earthquake is unknown, but the USGS said it suspected the Browns Valley section of the West Napa fault. New state maps show the locations of the West Napa Fault and associated faults in greater detail than ever before in such places as western city of Napa neighborhoods. a strike slip fault. We acquired seismic reflection, refraction, and guided-wave data along a 115-m-long profile across the known surface rupture zone of the West Napa Fault zone. Although the northern deep anomaly appears to cross the West Napa fault without apparent offset, the shallow wavelength, medium wavelength, and unfiltered magnetic data indicate that the apparent continuity of the deep magnetic anomaly across the West Napa fault separates two distinct magnetic sources. Some significant faults in the region are the Calaveras, Concord-Green Valley, Greenville, Hayward, Mt. As Bay Area earthquake fault lines go, the West Napa Fault — tentatively identified as the source of Sunday’s magnitude-6.0 temblor — is a relative stranger. 60 miles taking this route:Take I-80 WEST, from Sacramento, to SR-12 to NAPA at EXIT 39B.Take SR-12 WEST to (hra093) The valley is located at the southernmost end of the Mayacamas Mountains and extends from the north at Calistoga to just south of Napa. However, the fault had not been identified as being particularly hazardous prior to the quake that hit on 24 August. The San Andreas Fault System is an active plate boundary comprising right-lateral strike-slip faults that runs nearly the length of California. The 2000 quake was attributed to the West Napa Fault, but initially USGS scientists believed it was an unmapped, undiscovered fault system that was responsible. Our seismic survey was designed to image a strand of the West Napa Fault Zone (WNFZ), which ruptured during the 24 August 2014 Mw 6.0 South Napa Earthquake. 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