Home Inspections and Hazard Assessments in the Bay Area. 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. 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. Some significant faults in the region are the Calaveras, Concord-Green Valley, Greenville, Hayward, Mt. 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. Earthquakes are certainly the most famous natural hazard for homeowners in California. This will enable COMET & EwF researchers to analyse the surface deformation more quickly following earthquakes. 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. We ask all parties who are not feeling well to stay home and not attend the inspections. Many suspects appear on state earthquake maps. These crucial maps contain multiple new earthquake fault zones. 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. | 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. The bad news: There is likely far more shake potential in the Napa Valley than was previously attributed to the faulting there. This is the default - view for recent EFZ maps, available as downloadable files in Portable Document Format (pdf). White star denotes the epicenter located by USGS. 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 … The mainshock and smaller aftershocks are denoted by the yellow circles. This photo is taken at the northern end of the fault rupture, on the West side of Napa. The inhabitants of such a home would certainly feel a significant quake. Photo credit: Austin Elliott, UC Davis. 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. 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. Behind the scenes, we are cleaning and disinfecting our offices, and washing hands between stops. 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). 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 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.. 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. And you cannot rely on old Natural Hazard Disclosure (NHD) Reports to assess the risk to a property you plan to purchase. 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. HomeGuard Incorporated provides home inspections in Novato, Sacramento, and the Bay Area. 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. This earthquake is the biggest to hit the San Francisco Bay Area since the Mw 6.9 Loma Prieta earthquake in1989. This interferorgam shows up-down and to a lesser extent east-west motions. You will notice we have enacted policies such as not shaking hands when we meet, less face to face meetings, and wearing protective equipment. Sentinel-1A interferogram of the ground deformation due to the August 24th earthquake, Napa, California. M 6.0 - South Napa The respirator is stored in between encounters to be put on (‘donned’) again before the next encounter with clients. Previously unknown fault lines that ruptured during that quake have now been added. Image created by Dr Yngvar Larsen, from the research institute Norut in Norway, and Dr Petar Marinkovic, from PPO.labs in the Netherlands. The Earthquake Event Page application supports most recent browsers, view supported browsers. Skip to Main Content. Previously unmapped earthquake faults ruptured during the Aug. 24 magnitude-6.0 South Napa earthquake, \u0003surprising both scientists and homeowners. The pre-earthquake image was acquired on that day. EFZ is shown as the yellow polygon. The fault rupture (mapped by UC Davis scientists) resulting from the August 24 earthquake is shown by the black line, south-west of Napa. This relative motion is consistent with the right-lateral strike-slip faulting in this earthquake. location = 'https://homeguard.com/thank-you-sidebar/'; When the Sentinel-1 constellation is fully operational (with the launch next year of the identical Sentinel-1B satellite), the average time delay between an earthquake and a radar acquisition will only be a few days. The interferogram clearly confirms that the West Napa Fault was responsible for the earthquake. 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. Copyright: Copernicus data (2014)/ESA/PPO.labs-Norut–COMET-SEOM Insarap study. As with all fault zones that are active, the new zones require proper disclosure to those seeking to buy property that lies within them. The fault rupture (mapped by UC Davis scientists) resulting from the August 24 earthquake is shown by the black line, south-west of Napa. Assuming a continuous fault zone, the West Napa – Franklin Fault zone could be capable of generating a much larger magnitude earthquake than the M 6.0 that occurred on August 24, 2014. Call us at today at 855-331-1900, or feel free to use our online contact form to get a free quote. 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. The white rectangle and red triangles represent the surface projection of the fault plane and the strong motion stations, respectively. The risk varies depending on your location. A qualified home inspector can assess the state of your designated property. 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. Diablo, Rodgers Creek, San Andreas, San Gregorio, and West Napa faults. The epicenter of that earthquake was 20 km (12 mi) NNW of the South Napa epicenter, and also on the West Napa fault system. 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 … The mainshock and smaller aftershocks are denoted by the yellow circles. The only other noteworthy earthquake in the Napa area in the recent past (since 1973) was the M4.9 Yountville earthquake on September 3, 2000. (right) The same interferogram processed to show the total motion towards and away from the satellite. 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. 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 . (left) Sentinel-1A (European Space Agency) interferogram of the ground deformation from the Napa 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. Click here for our detailed COVID-19 inspection policy. Since then, they have been using the data to update the area’s fault zone maps. Fault map (red lines) of the region around the Napa Valley earthquake, California. 4b. 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. 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. State of California. The fault rupture (mapped by UC Davis scientists) resulting from the August 24 earthquake is shown by the black line, south-west of Napa. document.addEventListener( 'wpcf7mailsent', function( event ) { Earthquake locations and existing fault locations sourced from USGS. If the occupant is home, please remind them to keep the social distancing standard with the inspectors. The surface rupture offset kerb stones to the right by about 10-20 cm. 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. Earthquake Fault Zone(EFZ) map on the Hollywood Faul t from the Hollywood 7.5minute Quadrangle. It has been mapped as a Late Pleistocene-Holocene active fault, and is considered to be predominantly a right lateral strike-slip fault. | 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. Sitemap Beyond Gutter Cleaning – What Home Maintenance Tasks Are Best Done in Fall. The mainshock and smaller aftershocks are denoted by the yellow circles. After significant earthquake events, State Earthquake Fault Zone maps are usually updated. 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. Fault map (red lines) of the region around the Napa Valley earthquake, California. Earthquake locations and existing fault locations (red lines) are sourced from the USGS. (a) All strong motion stations and the GCMT focal solution (beach ball). Among a handful of other possibilities, the Franklin Fault also stands out. Many faults zoned in this area were … 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. Copyright: Copernicus data (2014)/ESA/PPO.labs-Norut–COMET-SEOM Insarap study. Copyright: Copernicus data (2014)/ESA/PPO.labs-Norut–COMET-SEOM Insarap study. }, false ); © 2020 HomeGuard ‐ All Rights Reserved The fault rupture ran through homes and across roads, buckling the tarmac surface and pavements, resulting in damage expected to cost hundreds of millions of dollars. In fact, newly revised earthquake maps have been created for the Napa area as a result of the 2014 South Napa 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 surface fault rupture (mapped in the field by UC Davis scientists) is shown by the white line. When was the last major earthquake on the Main Kopeh Dagh Fault in Turkmenistan? A map shows the location of the August 24, 2014 earthquake just south of Napa, California. 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. 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 black line denotes the surface rupture mapped in the field by scientists from UC Davis. 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. Greater Knowledge of Local Faults . 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? 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. Figure 1. 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. 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. Sentinel-1A was launched on 3 April 2014, but it only reached its final operational orbit on 7 August. Many faults zoned in this area were … 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. 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. Parts of the West Napa Fault Zone ruptured during the Aug. 24, 2014 South Napa earthquake, they said. Privacy Statement. Knowledge is power, and this information is critical for anticipating the risks you need to account for when living in or managing California properties. 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. Many suspects appear on state earthquake maps. Photo credit: Austin Elliott, UC Davis. 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. The earthquake is the largest to strike the Napa … 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. The contours show the ground motion towards and away from the satellite. 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. 4a. The Association of Bay Area Governments (ABAG) has released maps showing how major earthquakes along the region’s major faults could affect Napa County. 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. 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. South of the town of Napa, the ground has moved towards the satellite by up to 10 cm (red colours), whereas to the north it has moved away by 10 cm (blue colors). Corporate Office: 510 Madera Ave San Jose, CA 95112 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. This fault had not been identified as being particularly hazardous prior to the event. (bottom) Sentinel-1A interferogram showing the deformation field around 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). 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 foundation and structures would not be directly on the fault line as the surface is rupturing, but proximity to an active fault would likely inflict more damage, as it relates to fault rupture, than to homes further away. The dashed line denotes the regions shown in the other figures. Termite, Home, Roof Inspections, and NHD Reports. 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. (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). Ultimately, this enables you to exist in your home with the peace of mind you deserve. 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. Fault damage in the suburbs west of Napa, California from the August 24th magnitude 6 earthquake. 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. We are putting the health and safety of homeowners, buyers, REALTORS®️, and HomeGuard employees first during the Coronavirus Crisis. 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. Menu Contact Search Map view of the epicentral area of the 2014 South Napa earthquake. To limit exposure to the virus, we are asking that only if necessary, direct buyers and their Realtors attend the inspections. 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. This process is now complete, and updated maps have been issued that more accurately accounts for faults in the region. In fact, newly revised earthquake maps have been created for the Napa area as a result of the 2014 South Napa earthquake. Or, try our Real-time Notifications, Feeds, and Web Services . 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 spread of the virus has us all on high alert, but if we all work together then we can keep everyone safe. 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