This map courtesy of the U.S. Geological Survey (USGS) shows the major earthquake hazard areas within the United States based on fault lines: The USGS says the real threat over the next 30 years comes from smaller earthquakes occurring on one of these faults. Q: How did this earthquake compare to the Loma Prieta earthquake in 1989? 500+ Active faults in California >99%. All earthquakes spring from faults deep underground, but it can take scientists some time to identify the particular type of fault-line activity behind a specific earthquake. It is believed to be the northern extension of the Calaveras Fault in the East Bay region. The southern parts of the fault have remained inactive for over 200 years. This updated earthquake map should educate the state about quake risk zones and help residents grasp the geography of the fault lines. Skip to Main Content. Vallejo and American Canyon are closer to earthquake fault lines than anyone knew until the 2014 South Napa Earthquake shook loose information scientists didn’t have before. Which fault or faults it’s released on really hasn’t been known.". (Craig Miller/KQED). Chance of 1 or more M6.7 or greater earthquakes striking CA. It is connected to, and considered to be part of, the same fault zone as the Green Valley fault, which lies just a few miles to the north across the Suisun Bay. Four fault zone maps were released on Thursday along with 10 seismic hazard zones. SAN JOSE, Calif. (AP) — California geology officials have released an updated seismic map that includes more than 50 new fault lines discovered over the last two decades. State of California. One of the fault zones was in the Napa area where the 2014 earthquake … The reported epicenter of the 2014 South Napa earthquake was located beneath the Napa Valley Marina. All earthquakes spring from faults deep underground, but it can take scientists some time to identify the particular type of fault-line activity behind a specific earthquake. Trending. 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. Top Searches Holiday Gifts. Here are some maps of the fault lines. NAPA, CA - AUGUST 24: A worker looks at a pile of wine bottles that were thrown from the shelves at Van's Liquors following a reported 6.0 earthquake on August 24, 2014 in Napa, California. Think again. Virtual Tour using Google Earth. The mainshock and smaller aftershocks are denoted by the yellow circles. The fault rupture (mapped by UC Davis scientists) resulting from the August 24 earthquake is shown by the black line, south-west of Napa. Swipe. The colored lines are previously mapped faults, red indicating the "youngest" or most recently active. The second map is a map of all the fault lines that are in or go across of Napa. Or, try our Real-time Notifications, Feeds, and Web Services . Other Earthquake Fault Maps: Schwartz says it will take some time to complete the picture, but remapping the jumble of north-south faults in the area will likely change the official fault maps and lead to building restrictions along the most active faults. 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. Understanding the Earthquake Risk Where You Live. "The bottom line," he says, "is that the young faulting we see at the south end -- that deformation, that slip -- certainly continues north into Napa Valley. 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. southern california earthquake map fault lines: 7 results. The most extreme examples found so far in the wake of the South Napa Quake show about 18 (updated) inches of lateral offset. It is believed to be the northern extension of the Calaveras Fault in the East Bay region. "It doesn’t just end at the Napa Valley Airport. Although seismicity maps and earthquake catalogs show the past 100 to 150 years of felt and instrumental earthquakes, many faults in the United States have return times of thousands to tens of thousands of years for surface faulting events. The Geological Survey of Alabama provides an online interactive map of earthquake information for Alabama. A fault line or a fault is a fracture in the crust which had the crust moved. Before this study was conducted, geologists knew there was a fault in the area, but did not have a definitive answer until now. [4], The epicenter for the 2000 Yountville earthquake which occurred on September 3, 2000 is also near the West Napa Fault. The earthquake that occurred Wednesday didn't happen near a fault line in Tennessee, for the most part, the state is free of any faults that would suggest a vulnerability to earthquakes. The fault rupture (mapped by UC Davis scientists) resulting from the August 24 earthquake is shown by the black line, south-west of Napa. Understanding the Earthquake Risk Where You Live. If your home, driveway or pool were damaged in the South Napa earthquake, should you make repairs immediately – or wait until the local fault lines are better understood? "I think it’s hard to walk away from this and think otherwise," says geologist David Schwartz of the U.S. Geological Survey in Menlo Park. The map below shows what teams from USGS, the California Geological Survey, UC Davis and others had plotted as of August 26, just two days after the quake. Earthquakes are certainly the most famous natural hazard for homeowners in California. Many tribes even left the region permanently. In the next section we will provide the impact studies conducted on each of the faults in Washington State. It’s in the Earth’s crust going northwest up into Napa Valley. Get the best of KQED’s science coverage in your inbox weekly. Schwartz says the map is preliminary but provides a "pretty good approximation" of the likely final map. Data source: USGS CCCarto is not responsible for data errors or omissions, use as reference only. California >99%. Originally published January 3, 2015 at 6:02 am Updated January 3, 2015 at 8:16 am . Menu Contact Search Nov. 14: Anne Arundel, Maryland set one-day coronavirus record, testing sites see influx Q: How did this earthquake compare to the Loma Prieta earthquake in 1989? Virtual Tour using Google Earth. It is believed to be the northern extension of the Calaveras Fault in the East Bay region. The new earthquake faults created by the Napa quake will probably appear on the next California fault line map! Known surface faults and interpreted subsurface faults are also shown, allowing users to see the relationships between different identified faults To start the tour, download and open the “Hayward Fault Map and Tour” file in Google Earth (free download), then click the “Play Tour” button located at the bottom of the “Places” panel. Four fault zone maps were released on Thursday along with 10 seismic hazard zones. The bad news: There is likely far more shake potential in the Napa Valley than was previously attributed to the faulting there. ", Napa Quake Forces Redrawing of Fault Maps. Maps illustrating known fire, seismic, and other hazards are shown on the following pages. Preliminary mapping of side-slip at the surface reveals a fault in the Brown's Valley Section of the West Napa Fault Zone that extends well beyond what was known. This map is useful in showing the location and approximate length of faults but does not provide the impact an earthquake from a fault could have on the area surrounding. 15,700. Napa’s surprise fault line triggers earthquake study of the region Scott Whitlock walks over a stretch of buckled sidewalk while helping his parents move out of their damaged home. An earthquake fault zone runs through Beverly Hills’ world-famous Rodeo Drive shopping district, according to a new official California map. Quaternary Faults are those that appeared less than 1.6 million years ago — recently, in geologic time. Thanks for signing up for our newsletter. The Cascadia Subduction Zone, Pacific Northwest. 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