Privacy Statement. Figure 1. Copyright: Copernicus data (2014)/ESA/PPO.labs-Norut–COMET-SEOM Insarap study. Sentinel-1A was launched on 3 April 2014, but it only reached its final operational orbit on 7 August. 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. On the east side of the fault, these motions are in the same direction, either both towards or both away from the satellite, resulting in a large signal. 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. The Association of Bay Area Governments (ABAG) has released maps showing how major earthquakes along the region’s major faults could affect Napa County. A small discontinuity running north-south is also visible in the interferogram (marked by white triangles) and is due to minor rupture of a parallel fault strand across the airport runways. 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. A qualified home inspector can assess the state of your designated property. The fault rupture (mapped by UC Davis scientists) resulting from the August 24 earthquake is shown by the black line, south-west of Napa. 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. State of California. 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.. The surface fault rupture (mapped in the field by UC Davis scientists) is shown by the white line. Termite, Home, Roof Inspections, and NHD Reports. The mainshock and smaller aftershocks are denoted by the yellow circles. The surface rupture offset kerb stones to the right by about 10-20 cm. 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. Ultimately, this enables you to exist in your home with the peace of mind you deserve. Among a handful of other possibilities, the Franklin Fault also stands out. Knowledge is power, and this information is critical for anticipating the risks you need to account for when living in or managing California properties. New homes cannot be constructed on a fault line, but generally they may be built 50 feet or more away from one. This interferorgam shows up-down and to a lesser extent east-west motions. The mainshock and smaller aftershocks are denoted by the yellow circles. And you cannot rely on old Natural Hazard Disclosure (NHD) Reports to assess the risk to a property you plan to purchase. The interferogram was created by COMET collaborators Dr Yngvar Larsen, from the research institute Norut in Norway, and Dr Petar Marinkovic, from PPO.labs in the Netherlands. We are making every effort to help prevent the spread of the virus and we understand that our employees and company policies play an important part. 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. 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. Scientists have used a new Earth-observation satellite called Sentinel-1A to map the ground movements caused by the earthquake that shook up California's wine-producing Napa Valley on 24 August 2014. The pre-earthquake image was acquired on that day. 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). COMET Director, Tim Wright, from University of Leeds said, “This successful demonstration of Sentinel-1A marks the beginning of a new era for our ability to map earthquakes from space. | Skip to Main Content. You will notice we have enacted policies such as not shaking hands when we meet, less face to face meetings, and wearing protective equipment. The images are being used by scientists (such as such as field teams from the University of California Davis) on the ground to help them map the surface rupture. The epicenter of that earthquake was 20 km (12 mi) NNW of the South Napa epicenter, and also on the West Napa fault system. 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. The bad news: There is likely far more shake potential in the Napa Valley than was previously attributed to the faulting there. When the Sentinel-1 constellation is fully operational, the average time delay between an earthquake and a radar acquisition will only be a few days, which will mean the results will also be useful for helping with humanitarian responses on the ground. The contours show the ground motion towards and away from the satellite. If the occupant is home, please remind them to keep the social distancing standard with the inspectors. Since then, they have been using the data to update the area’s fault zone maps. Whether you are a buyer, a seller, a property developer or simply a concerned homeowner, getting your home inspected and obtaining an up-to-date NHD Report is vital. Scientists predict that within a 30-year period (beginning in 2014), there’s a 51 percent chance that the San Francisco region specifically will experience one or more magnitude-7.0 or greater earthquakes . We ask all parties who are not feeling well to stay home and not attend the inspections. The 6.0-magnitude quake struck at 3:20 a.m. local time near American Canyon, about 6 miles southwest of Napa, at a depth of 6.7 miles. 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. The earthquake is the largest to strike the Napa … The interferogram also reveals other portions of the fault system that have moved slightly in this event. 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. Call us at today at 855-331-1900, or feel free to use our online contact form to get a free quote. Image created by Dr Yngvar Larsen, from the research institute Norut in Norway, and Dr Petar Marinkovic, from PPO.labs in the Netherlands. Many suspects appear on state earthquake maps. location = 'https://homeguard.com/thank-you-sidebar/'; EFZ is shown as the yellow polygon. This photo is taken at the northern end of the fault rupture, on the West side of Napa. 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. Corporate Office: 510 Madera Ave San Jose, CA 95112 The Words We Use Can Make A Difference, Why You Need a Home Inspection Before You Buy Real Estate, Tips for Negotiating Repairs after Your Temecula Home Inspections. 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. | The 2014 South Napa earthquake occurred in the North San Francisco Bay Area on August 24 at 03:20:44 Pacific Daylight Time.At 6.0 on the moment magnitude scale and with a maximum Mercalli intensity of VIII (Severe), the event was the largest in the San Francisco Bay Area since the 1989 Loma Prieta earthquake.The epicenter of the earthquake was located to the south of Napa and to the … (top) Satellite image of Napa County Airport, five miles south of Napa (GoogleEarth) and the southern extent of the mapped surface rupture (shown in white, UC Davis). Map view of the epicentral area of the 2014 South Napa earthquake. Parts of the West Napa Fault Zone ruptured during the Aug. 24, 2014 South Napa earthquake, they said. In fact, newly revised earthquake maps have been created for the Napa area as a result of the 2014 South Napa earthquake. M 6.0 - South Napa Earthquake locations and existing fault locations (red lines) are sourced from the USGS. Some significant faults in the region are the Calaveras, Concord-Green Valley, Greenville, Hayward, Mt. Or, try our Real-time Notifications, Feeds, and Web Services . Despite being a strike-slip earthquake in which most motion is horizontal, the satellite measures mainly vertical and east-west motion and sees the ends of the rupture bulge up (and eastwards) at one end (towards the satellite in the south) and down (and west) at the other. We provide natural hazard reports (also referred to as natural hazard disclosure reports or NHD reports), so you might avoid future surprises ranging from inconvenient to alarming. The black line denotes the surface rupture mapped in the field by scientists from UC Davis. During this time we are asking our employees to be extra diligent with safety measures, to not work if they are feeling ill in any way, and to self-quarantine, if they or any of their family members have been exposed to COVID-19. Photo credit: Austin Elliott, UC Davis. HomeGuard Incorporated provides home inspections in Novato, Sacramento, and the Bay Area. This earthquake is the biggest to hit the San Francisco Bay Area since the Mw 6.9 Loma Prieta earthquake in1989, although this most recent earthquake was many times smaller. The fault rupture (mapped by UC Davis scientists) resulting from the August 24 earthquake is shown by the black line, south-west of Napa. 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. 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. Greater Knowledge of Local Faults . This earthquake is the biggest to hit the San Francisco Bay Area since the Mw 6.9 Loma Prieta earthquake in1989. The fault rupture (mapped by UC Davis scientists) resulting from the August 24 earthquake is shown by the black line, south-west of Napa. HomeGuard Inspectors are to follow The Center for Disease Control and Prevention (CDC) and The National Institute for Occupational Safety and Health, (NIOSH), which have existing guidelines and combinations of recommendations and approaches to conserve respirator supply while safeguarding worker’s health during shortages in pandemic situations. These crucial maps contain multiple new earthquake fault zones. 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