A line also runs under the west side of American Canyon, with the main part of the city not visible in the new map. The rupture unzipped along the West Napa fault, and propagated onto a previously unrecognized branch of the fault that runs directly through the Napa neighborhood of Browns Valley. Diablo, Rodgers Creek, San Andreas, San Gregorio, and West Napa faults. But it could be worseâfaults that rupture the surface can move a few feet or more, causing buildings to collapse. 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 near Buhman Avenue in Napa, California. (Image credit: USGS) Why it happened. Get up-to-the-minute news sent straight to your device. âItâs up to the geologist to identify where that fault is. The projectâs environmental impact report using post-South Napa earthquake research found surface fault rupturing. Geologic Setting West of the San Andreas Fault . Be Proactive. As of January 12, 2017, the USGS maintains a limited number of metadata fields that characterize the Quaternary faults and folds of the United States. On the list of Californiaâs most dangerous earthquake faults, the West Napa Fault in the Bay Area doesnât rank as especially notorious. The West Napa Fault in Napa County is believed to be a continuation of the Calaveras Fault north of the Carquinez Strait.Between the faults lies an area of minor faults aligned en echelon known as the Contra Costa Shear Zone.. State Senior Engineering Geologist Timothy Dawson called the earthquake âa game changerâ that gave scientists more information about local faults. North Bay Area Fault Map The Northern California Area is woven by a series of major faults from the meeting of the huge Pacific and North American plates. Be Truthful. The new Napa Quadrangle and revised Cuttings Wharf Quadrangle maps cover the West Napa Fault Zone, which extends from the Vallejo area northwards, where the fault ⦠Sunday's 6.0 magnitude earthquake in Napa, California, was a jolt from the blue, involving previously unknown active fault lines as well as faults that were thought to be inactive. Sharp lines in the interferogram show minor movements on other faults, such as the part of the West Napa Fault system that crosses Napa airport. KML (Google Earth-type) files and GIS shape files are also available for download from the site. The two mountain ranges of the Napa Valley were created during the formation of the San Andreas fault. You donât want the fault to move under the building and damage the building or foundation.â. The fault rupture (mapped by UC Davis scientists) resulting from the August 24 earthquake is shown by the black line, south-west of Napa. 36a There is an interactive map application to view the faults online and a separate database search function. Fault map (red lines) of the region around the Napa Valley earthquake, California. The fault zone that ruptured in the South Napa earthquake had been previously recognized as a strand of the West Napa Fault zone . The West Napa Fault suddenly thrashed and rocked on Aug. 24 â and has continued moving at an…. Retrofits such as bolting a home to the foundation and strengthening cripple walls help homes survive the shaking associated with earthquakes. Accordingly, we interpret the estimates of z u as a map of the position of a slip frontâeither coseismic or postseismicâthat propagated on an extant fault plane. An online map of United States Quaternary faults (faults that have been active in the last 1.6 million years) is available via the Quaternary Fault and Fold Database. The West Napa Fault is located approximately 2.1 kilometers (1.3 miles) southwest of the site and is assigned a two percent probability of an earthquake with a magnitude greater than 6.7 by 2043. 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. Among the features on the maps are thick, yellow lines called âearthquake fault zones.â State law requires developers building in these areas to have geological investigations done to avoid building homes and other structures where a fault can rupture the surface. Select a fault by clicking on the map or on one of the buttons below. 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