White star denotes the epicenter located by USGS. HomeGuard Incorporated provides home inspections in Novato, Sacramento, and the Bay Area. However, this particular earthquake occurred on one of the parallel fault systems 40 km east of the San Andreas. 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. We are putting the health and safety of homeowners, buyers, REALTORS®️, and HomeGuard employees first during the Coronavirus Crisis. The pre-earthquake image was acquired on that day. 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. 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). 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 interferogram clearly confirms that the West Napa Fault was responsible for the earthquake. 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 fault rupture (mapped by UC Davis scientists) resulting from the August 24 earthquake is shown by the black line, south-west of Napa. Copyright: Copernicus data (2014)/ESA/PPO.labs-Norut–COMET-SEOM Insarap study. The surface rupture offset kerb stones to the right by about 10-20 cm. Many faults zoned in this area were … 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. The white rectangle and red triangles represent the surface projection of the fault plane and the strong motion stations, respectively. 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. State of California. And you cannot rely on old Natural Hazard Disclosure (NHD) Reports to assess the risk to a property you plan to purchase. Knowledge is power, and this information is critical for anticipating the risks you need to account for when living in or managing California properties. EFZ is shown as the yellow polygon. If the occupant is home, please remind them to keep the social distancing standard with the inspectors. The risk varies depending on your location. We ask all parties who are not feeling well to stay home and not attend the inspections. This earthquake is the biggest to hit the San Francisco Bay Area since the Mw 6.9 Loma Prieta earthquake in1989. Earthquakes without Frontiers is supported by the Natural Evironment Research Council (, New satellite maps out Napa Valley earthquake, field teams from the University of California Davis. 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 … 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. By comparing it with an image acquired on 31 August, it is possible to create a map of the surface deformation caused by the magnitude 6.0 earthquake by looking at the difference in time it takes the signal to reach the satellite. Photo credit: Austin Elliott, UC Davis. Parts of the West Napa Fault Zone ruptured during the Aug. 24, 2014 South Napa earthquake, they said. Call us at today at 855-331-1900, or feel free to use our online contact form to get a free quote. 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 mainshock and smaller aftershocks are denoted by the yellow circles. Termite, Home, Roof Inspections, and NHD Reports. 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. AN IMPORTANT NOTE REGARDING INSPECTIONS AND COVID-19: Click to share on Facebook (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Pinterest (Opens in new window), Click to share on Reddit (Opens in new window), Click to share on Tumblr (Opens in new window), Be Prepared in a Red Hot San Diego & California Real Estate Market, Counteroffer Or Inquiry? This is the fault map (red lines) of the region around the Napa Valley earthquake, California. After significant earthquake events, State Earthquake Fault Zone maps are usually updated. This fault had not been identified as being particularly hazardous prior to the event. | Fault map (red lines) of the region around the Napa Valley earthquake, California. The mainshock and smaller aftershocks are denoted by the yellow circles. The agency has begun to officially map and zone this section of the West Napa fault, which could restrict or limit future construction in the areas where scientists pinpoint the fault. 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. One is the West Napa Fault, which stretches 35 miles (57 km) from the city of St. Helena south to San Pablo Bay, according to a USGS report published in 2008. 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. The small surface displacements measured in the interferogram agree with the small offsets measured in the field by geologists surveying the fault rupture, who find displacements in roads and kerb stones of about 10-20 cm. M 6.0 - South Napa 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. 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. (right) The same interferogram processed to show the total motion towards and away from the satellite. This process is now complete, and updated maps have been issued that more accurately accounts for faults in the region. 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. 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 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. The contours show the ground motion towards and away from the satellite. Image created by Dr Yngvar Larsen, from the research institute Norut in Norway, and Dr Petar Marinkovic, from PPO.labs in the Netherlands. A map shows the location of the August 24, 2014 earthquake just south of Napa, California. 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 Mw 6.0 South Napa earthquake of August 24, 2014, produced complex and extensive surface faulting and other ground deformation features. New homes cannot be constructed on a fault line, but generally they may be built 50 feet or more away from one. Earthquake locations and existing fault locations sourced from USGS. This photo is taken at the northern end of the fault rupture, on the West side of Napa. Earthquakes are certainly the most famous natural hazard for homeowners in California. The bad news: There is likely far more shake potential in the Napa Valley than was previously attributed to the faulting there. Since then, they have been using the data to update the area’s fault zone maps. Home Inspections and Hazard Assessments in the Bay Area. Among a handful of other possibilities, the Franklin Fault also stands out. 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 . 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. Copyright: Copernicus data (2014)/ESA/PPO.labs-Norut–COMET-SEOM Insarap study. Map view of the epicentral area of the 2014 South Napa earthquake. We want you to know that at HomeGuard Incorporated, we are working to promote safety first to you and your families, and to our employees. Or, try our Real-time Notifications, Feeds, and Web Services . Skip to Main Content. The interferogram also reveals other portions of the fault system that have moved slightly in this event. 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. Some significant faults in the region are the Calaveras, Concord-Green Valley, Greenville, Hayward, Mt. 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. 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. 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. (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). 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 will enable COMET & EwF researchers to analyse the surface deformation more quickly following earthquakes. This relative motion is consistent with the right-lateral strike-slip faulting in this earthquake. (bottom) Sentinel-1A interferogram showing the deformation field around the fault. The fault rupture (mapped by UC Davis scientists) resulting from the August 24 earthquake is shown by the black line, south-west of Napa. (a) All strong motion stations and the GCMT focal solution (beach ball). In fact, newly revised earthquake maps have been created for the Napa area as a result of the 2014 South Napa earthquake. 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. 4a. Photo credit: Austin Elliott, UC Davis. The spread of the virus has us all on high alert, but if we all work together then we can keep everyone safe. Greater Knowledge of Local Faults . Many faults zoned in this area were … 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). Beyond Gutter Cleaning – What Home Maintenance Tasks Are Best Done in Fall. 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. Many suspects appear on state earthquake maps. It has been mapped as a Late Pleistocene-Holocene active fault, and is considered to be predominantly a right lateral strike-slip fault. In fact, newly revised earthquake maps have been created for the Napa area as a result of the 2014 South Napa earthquake. These crucial maps contain multiple new earthquake fault zones. | 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. 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. | The earthquake is the largest to strike the Napa … Diablo, Rodgers Creek, San Andreas, San Gregorio, and West Napa faults. 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.. Click here for our detailed COVID-19 inspection policy. The black line denotes the surface rupture mapped in the field by scientists from UC Davis. Ultimately, this enables you to exist in your home with the peace of mind you deserve. Fault damage in the suburbs west of Napa, California from the August 24th magnitude 6 earthquake. Sentinel-1A interferogram of the ground deformation due to the August 24th earthquake, Napa, California. The Association of Bay Area Governments (ABAG) has released maps showing how major earthquakes along the region’s major faults could affect Napa County. 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