Whilst most of the motion in a strike-slip earthquake is horizontal in the direction of the fault, the ground motion at the end of these fault ruptures is a combination of fault perpendicular and vertical. Parts of the West Napa Fault Zone ruptured during the Aug. 24, 2014 South Napa earthquake, they said. 4b. The earthquake occurred north of the Bay Area, California, in a part of the fault system which runs down the length of California and includes the San Andreas Fault. After significant earthquake events, State Earthquake Fault Zone maps are usually updated. Fault map (red lines) of the region around the Napa Valley earthquake, California. Skip to Main Content. HomeGuard Incorporated provides home inspections in Novato, Sacramento, and the Bay Area. All inspectors are to use an additional respirator separate from their crawlspace-subarea mask for multiple face-to-face encounters with clients, in a clean environment, (such as) the interior of the home during ( iPad summary/face-to-face ) interactions but removing the respirator (‘doffing’) after each encounter with clients. Beyond Gutter Cleaning – What Home Maintenance Tasks Are Best Done in Fall. Menu Contact Search The risk varies depending on your location. The extent of the ground deformation in interferogram shows that the fault slip which occurred in this earthquake continues further north than the extent of the mapped rupture at the surface. Click here for our detailed COVID-19 inspection policy. Or, try our Real-time Notifications, Feeds, and Web Services . A major earthquake (6.0 on the Richter scale) struck Napa Valley in late August of 2014, changing the geology of the area, and giving geologists reams of fresh data. This earthquake is the biggest to hit the San Francisco Bay Area since the Mw 6.9 Loma Prieta earthquake in1989. Magnitude 6.7 Earthquake on the West Napa Fault ... Napa Fault Chico San Francisco ± 0 5 10 20 30 40 Miles Location Map Estimated Injuries and Fatalities at 2am, for This Scenario:11,040 San Francisco Sacramento Eureka. The interferogram also reveals other portions of the fault system that have moved slightly in this event. This interferorgam shows up-down and to a lesser extent east-west motions. In Northern California, the nine Bay Area counties are more prone to shaking than in the Sacramento area, but earthquakes are a fact of life statewide and could have an impact on your choice of property. This process is now complete, and updated maps have been issued that more accurately accounts for faults in the region. We ask all parties who are not feeling well to stay home and not attend the inspections. A new Earth-observation satellite called Sentinel-1A has been used for the first time to map the ground movements caused by the magnitude 6 earthquake that shook up California’s wine-producing Napa Valley on 24 August 2014 (European Space Agency). In a new report, scientists from MIT and elsewhere detail how, even after the earthquake’s main tremors and aftershocks died down, earth beneath the surface was still actively shifting and creeping — albeit much more slowly — for at least four weeks after the main event. When the South Napa Fault ruptured last summer and shook the historic city of Napa, the earthquake hit the oldest buildings with the heaviest damage, a new review by seismologists reveals. This is the fault map (red lines) of the region around the Napa Valley earthquake, California. Diablo, Rodgers Creek, San Andreas, San Gregorio, and West Napa faults. Following the event, geologists made more than 1,200 field observations at locations where tectonic faulting and ground failure produced visible deformation that fractured and disturbed the ground surface. The mainshock and smaller aftershocks are denoted by the yellow circles. Behind the scenes, we are cleaning and disinfecting our offices, and washing hands between stops. And you cannot rely on old Natural Hazard Disclosure (NHD) Reports to assess the risk to a property you plan to purchase. However on the western side of the fault, the east-west and vertical motions are in the opposite sense, cancelling each other out and explaining the asymmetry seen in the deformation pattern across the fault. The interferogram shows that the southeast-side of the rupture has moved towards the satellite by about 10cm, whilst the northern portion has moved away by 10cm. Copyright: Copernicus data (2014)/ESA/PPO.labs-Norut–COMET-SEOM Insarap study. EFZ is shown as the yellow polygon. Call us at today at 855-331-1900, or feel free to use our online contact form to get a free quote. The surface rupture offset kerb stones to the right by about 10-20 cm. The interferogram of the rupture clearly confirms that part of the West Napa Fault system was responsible for the earthquake (BBC News Article on the satellite interferogram and earthquake). The earthquake is the largest to strike the Napa … These and several other major faults in the region are part of the San Andreas fault system and can cause damaging earthquakes, like the 1989 Loma Prieta earthquake. This will enable COMET & EwF researchers to analyse the surface deformation more quickly following earthquakes. }, false ); © 2020 HomeGuard ‐ All Rights Reserved White star denotes the epicenter located by USGS. You will notice we have enacted policies such as not shaking hands when we meet, less face to face meetings, and wearing protective equipment. If the owner or occupant of the house is not feeling well, is elderly or at-risk, or has been exposed to the virus, please call us and we will reschedule the inspections to a time when the occupant will not be disturbed and the structure can be safely entered. M 6.0 - South Napa 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. Fault damage in the suburbs west of Napa, California from the August 24th magnitude 6 earthquake. location = 'https://homeguard.com/thank-you-sidebar/'; The pre-earthquake image was acquired on that day. (bottom) Sentinel-1A interferogram showing the deformation field around the fault. | The San Andreas Fault and many other Northern California fault zones are running north-south: Rodgers Creek fault zone, Maacama fault zone, Alexander-Redwood Hill fault , Hunting Creek-Berryessa fault zone, and West Napa fault zone. At least one good thing will come of the recent South Napa Earthquake that shook the wine country on August 24: It will lead to much better maps of active faulting in that area. Copyright: Copernicus data (2014)/ESA/PPO.labs-Norut–COMET-SEOM Insarap study. This fault had not been identified as being particularly hazardous prior to the event. This is the default - view for recent EFZ maps, available as downloadable files in Portable Document Format (pdf). This photo is taken at the northern end of the fault rupture, on the West side of Napa. These crucial maps contain multiple new earthquake fault zones. The mainshock and smaller aftershocks are denoted by the yellow circles. Many faults zoned in this area were … The rapidly populating coastal region from the Gulf to Pakistan faces a huge tsunami risk, Active faulting and great earthquakes – field work in Turkmenistan, The 2016 field work campaign on the Dzhungarian Fault. Sharp lines in the interferogram known as discontinuities, show minor movements on other faults, such as the part of the West Napa Fault system that crosses Napa airport. document.addEventListener( 'wpcf7mailsent', function( event ) { The fault rupture (mapped by UC Davis scientists) resulting from the August 24 earthquake is shown by the black line, south-west of Napa. 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.. Existing fault maps show that the Franklin Fault extends southward to the Calaveras Fault zone and the West Napa Fault extends north of the seismic array. Map view of the epicentral area of the 2014 South Napa earthquake. The Mw 6.0 South Napa earthquake of August 24, 2014, produced complex and extensive surface faulting and other ground deformation features. 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