San Andreas. As you returned to your home, you would probably see damaged and collapsed buildings and bridges, broken pipes and snapped power lines and scorched remains of fires. Liability Ins PCA 1045011 No data point selected. In other words, in 11 more years we will have exceeded the historic maximum span of 160 years (U.C. The study concluded that there is 33% likelihood of a surface-rupturing earthquake within the next 30 years. This website is intended to help clients of Bay Area Retrofit to understand their retrofit proposals. -written by Lisa Wald, Kate Scharer, and Carol Prentice, U.S. Geological Survey. Public domain.). The Hayward Fault is 40 miles long and about 8 miles deep and trends along the east side of San Francisco Bay. The slip rate near the San Andreas fault is … The city of Ukiah, in Northern California sits right next to the Maacama Fault, which is capable of M=7.5 earthquakes and poses a significant threat to the region. The Hayward fault under Oakland is more dangerous than the well-known San Andreas fault in Southern California, according to a new study that says it has the potential to kill at least 800 people and injure 18,000 more, The Los Angeles Times reported. The Hayward Fault. On page 10 of Seismic Behavior of Level and Stepped Cripple Walls by Y. H. Chai, it states, “More than half of the $40 billion dollar property losses in the Northridge Earthquake were due to failures of wood frame construction, primarily as a result of the damage or collapse of residential, single-family homes ……………..”  Damage from the Hayward Fault will greatly exceed this. Map of faults in southern California. The San Andreas Fault and 6 other significant fault zones are present in the Bay Area: the Calaveras, Concord-Green Valley, Greenville, Hayward, Rodgers Creek, and San Gregorio Faults. Along the San Francisco peninsula no detectable slip occurs (less than 1.5 mm/yr) at the surface, but appreciable strain is accumulating. As of 2020 it has been 151 years since the last big earthquake in 1868. This means that earthquakes as large as M=7.4 are possible on both sides of San Francisco Bay, rather than just on the San Andreas, as we had thought before. The ground consistently moves a few millimeters each year, pulling apart sidewalks, pipelines and other structures that sit astride the fault. Bay Area Retrofit assumes no responsibility or liability for use by homeowners, contractors, engineers, or anyone else of the information provided on this site. Geographic Names Information System (GNIS), Mapping, Remote Sensing, and Geospatial Data, Earthquake Outlook for the San Francisco Bay Region 2014—2043, Map of active faults and historic ruptures in California, New Information About the San Andreas Fault, Catching Glimpses of Centuries-Old Earthquakes, Science of the New Madrid Seismic Zone - Paleoseismology, UCERF3: A New Earthquake Forecast for California’s Complex Fault System. The Hazel Dell site near Corralitos, CA was trenched in 2013 to characterize the Santa Cruz Mountains section of the San Andreas Fault. For a 12-minute video concerning the Hayward Fault, see the KQED documentary Predictable Peril. New Study Finds Hayward Fault More Dangerous Than San Andreas. Near fault shear strain rates are 0.6 ± 0.1 μstrain/yr (engineering) with direction N47°W ± 9. The results of this study indicate that this section of the San Andreas Fault is likely to have a large earthquake in the not-too-distant future. A paleoseismic study in 2007 at Tyson’s Lagoon (now a BART station) found evidence for 12 paleoearthquakes (including the historical 1868 earthquake) with an average time between earthquakes of about 160 years. The Calaveras Fault is a major branch of the San Andreas Fault System that is located in northern California in the San Francisco Bay Area.Activity on the different segments of the fault includes moderate and large earthquakes as well as aseismic creep.The last large event was the 1984 Morgan Hill event and the last moderate earthquake was the 2007 Alum Rock event. Its last major rupture occurred in 1868, during California's frontier days, and was the original "Great San Francisco Earthquake" until 1906.. Like the Loma Prieta earthquake of 1989, the San Andreas Fault was responsible for … The scariest scenario for the next major earthquake may […] Investigating past earthquakes to inform the future. North to south, it runs from just west of Pinole Point on the south shore of San Pablo Bay and through Berkeley (just under the western rim of the Retrofit design is based on many factors. The transform boundary initiated about 30 million years ago when a spreading ridge separating the Pacific and Farallon Plates intersected with the North American continental crust near what is now Los Angeles, California (Fig. (See Earthquake Outlook for the San Francisco Bay Region 2014—2043). The plate is moving slowly all the time, but the edges move in fits and starts. Most cities in South Bay are about 5 miles from the San Andreas fault, while the Hayward faults cuts through many East Bay cities (see California Geological Survey - CGS's Information Warehouse.). The 1906 San Francisco earthquake is estimated to have been in the 7.8 range (and possibly even larger.) The ground consistently moves a few millimeters each year, pulling apart sidewalks, pipelines and other structures that sit astride the fault. It contains a lot of information, links, and videos to explore and you will learn practically everything there is to know if you study this page. According to the Association of Bay Area Governments the Hayward Fault will cause $165 billion in damage when it ruptures. New studies farther to the northwest along the Peninsula section of the San Andreas Fault also show a long interval between the 1906 earthquake and the previous earthquake, which occurred around 1300. (Public domain.). The San Andreas Fault is a continental transform fault that extends roughly 1,200 kilometers (750 mi) through California. The Hayward Fault is 40 miles long and about 8 miles deep and trends along the east side of San Francisco Bay. Workers' Comp RWCC64393236 Many smaller faults branch from and join the San Andreas fault zone. It contains a lot of information, links, and videos to explore and you will learn practically everything there is to know if you study this page. The chart below should give you some perspective on how much devastation this is compared to other large earthquakes. The San Andreas Fault is a crack in the Earth's crust in California, some 680 miles long. In fact, when the "big one" happens, it is more likely to happen on the Hayward Fault than it is to happen on the San Andreas Fault. Or is the size of the 1812 earthquake (~M7.1) more common? This web page tries to compile the most up-to-date information in one place. Drop, Cover and Hold On sign. Along the southernmost San Andreas, from Palm Springs to the Salton Sea, earthquakes happen infrequently, about every 200-300 years. Since then, nearly three million people have moved next to the Hayward fault with little regard for its earthquake potential. All rights reserved. The average time interval between the 5 most recent earthquakes is a little shorter, about 140 years. Posted April 19, 2018, under Blog. It forms the tectonic boundary between the Pacific Plate and the North American Plate, and its motion is right-lateral strike-slip (horizontal). The four areas singled out in the study are: Hayward, Rodgers Creek, northern Calaveras and Green Valley. The San Andreas Fault is locked in many places; much of its energy is released in the form of earthquakes. Its last major rupture occurred in 1868, during California's frontier days, and was the original "Great San Francisco Earthquake" until 1906.. Homeowner’s Guide to Seismic Retrofitting. From 1812 to 1906 it generated four major earthquakes of M 7 or larger in two pairs on two major portions of the fault. When the ground stops suddenly the house wants to keep on going and slides off the foundation. Since then, nearly three million people have moved next to the Hayward fault with little regard for its earthquake potential. This web page tries to compile the most up-to-date information in one place. The San Andreas Fault and the San Francisco Bay Area This image shows San Andreas Lake and Crystal Springs reservoir from the air, looking SouthEast from HERE. Since then, research has indicated that the likelihood of a Hayward quake is greater and more threatening to the 7 million Bay Area residents than a San Andreas … Using the forecasts, we can properly engineer structures, plan for earthquake response, and be prepared at home to make a big difference in the impact of a significant earthquake. Fault-plane reflections reveal that two of these faults, the San Andreas and Hayward, dip toward each other below seismogenic depths at 60° and 70°, respectively, and persist to the base of the crust. What does the science say? According to a new study, the Hayward fault line that runs under Oakland, California is believed to be more dangerous than the infamous San Andreas fault line that spans Southern California.. 1 A). Public domain.). Here is the graphic history of earthquakes on the Hayward fault. The SAFZ is the main part of the boundary between the Pacific tectonic plate on the west side and the North American plate on the east side. The SAFZ started moving about 28-30 million years ago and has horizontally slipped (transform motion) a total of about 300-350 km (186-220 mi)since it began moving. It is similar to riding in the back of a pick-up truck which accelerates very quickly and stops suddenly. The Hayward fault in the San Francisco Bay area runs through a densely-populated area, so it has been studied quite a bit. The San Andreas Fault and 6 other significant fault zones are present in the Bay Area: the Calaveras, Concord-Green Valley, Greenville, Hayward, Rodgers Creek, and San Gregorio Faults. Here is a shorter eye-opening 7-minute TV clip on the Cascadia Fault. The San Andreas fault caused the biggest earthquakes in California with an approximate magnitude 7.9 in 1857 (Southern California) and 1906 (San Francisco). The entire San Andreas fault system is more than 800 miles long and extends to depths of at least 10 miles within the Earth. Where does the information come from? Personally I like the following 50 minute BBC documentary on the Cascadia Fault which triggers the San Andreas Fault 75% of the time when it ruptures. This means that earthquakes as large as M=7.4 are possible on both sides of San Francisco Bay, rather than just on the San Andreas, as we had thought before. The Hayward fault is a 90 kilometer long crack in the Earth's crust that travels through the San Francisco Bay area. San Francisco Bay Area Earthquakes: The Hayward and San Andreas Faults are probably the most studied earthquake faults in the world, so a lot is known about them. 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