hayward and san andreas fault

The Hayward fault dataset includes 1489 earthquakes with magnitudes from … The study concluded that there is 33% likelihood of a surface-rupturing earthquake within the next 30 years. This in turn can cause the Hayward Fault to rupture. This includes Cripple Wall Retrofits, No Cripple Wall Retrofits, Retrofits of Homes with Living Area above a Garage, and Hillside Home Retrofits, THE SAN ANDREAS FAULT IS QUITE DANGEROUS AND CAN CREATE AN EARTHQUAKE 8.0 OR MORE ON THE RICHTER SCALE. The earthquake will cause $90.4 billion damage to residential buildings and 96.4 to commercial buildings. The most recent major earthquake on this fault was approximately M6.9 and occurred in 1868. San Andreas. Studies of this section of the fault suggest an average recurrence interval of 200-300 years. The Hayward fault runs through the East Bay hills from Richmond to San Jose. IT IS NOT INTENDED AS A GUIDE FOR DIY RETROFITS. About 100 km to the northwest along the fault another site at Frazier Mountain has been investigated. The faults are boundaries between blocks, and each block is constantly moving, which we can see by analyzing GPS (Global Positioning System) data. The In 1836 there was a large earthquake but the larges was felt on October 21, 1868. The Hayward Fault is a "tectonic time bomb, due any time for another magnitude 6.8 to 7.0 earthquake," according to a 2008 USGS report. The fault has been creeping about 4.6 mm/yr (0.2 inches/yr) for the last several decades, but that is only half of the long-term slip rate, so stress is building upon this fault. The author Kathryn Schultz writes “When the next very big earthquake hits, the northwest edge of the continent, from California to Canada and the continental shelf to the Cascades, will drop by as much as six feet and rebound thirty to a hundred feet to the west . Each house is unique. Analysis of a geodetic network of 115 lines crossing the San Andreas, Hayward, and Calaveras faults in the vicinity of San Francisco Bay and measured repeatedly between 1970 and 1980 has revealed details about the accommodation of relative plate motion in this area. This page was last edited on 23 August 2020, at 21:45. unconsolidated surficial deposits. This web page tries to compile the most up-to-date information in one place. For a 12-minute video concerning the Hayward Fault, see the KQED documentary Predictable Peril. Maybe you’ve heard that the “Big One is overdue” on the San Andreas Fault. The slip rate near the San Andreas fault is … The relative motion between these two tectonic plates is 50 mm/yr (about 2 inches/yr), but that rate is distributed across all the faults that are part of the SAFZ. Contractors Lic #558462 The four areas singled out in the study are: Hayward, Rodgers Creek, northern Calaveras and Green Valley. Be sure and click the Map View and watch the videos. The 150th anniversary of the 1868 earthquake, and all historical earthquake anniversaries, are opportunities to remind people that we live in earthquake country and 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. Earth scientists have been gathering data at key paleoseismic sites along sections of the San Andreas Fault to figure out the past timeline of earthquakes at each spot. To see the full scale of the devastation when that tsunami recedes, you would need to be in the international space station.”  FEMA conservatively anticipates a death toll of 13,000. The fault has been creeping about 4.6 mm/yr (0.2 inches/yr) for the last several decades, but that is only half of the long-term slip rate, so stress is building upon this fault. The Hayward Fault. The San Andreas has long been the quake fault California fears the most. Click the … (Photo from: Trulia) In California, when most people think about faults, their thoughts are immediately drawn to the San Andreas, and to a lesser extent, the Hayward Fault. Posted April 19, 2018, under Blog. At the time, it was known as the 'great San Francisco quake' (this was before the infamous 1906 quake, produced by the San Andreas fault), and it produced massive amounts of damage and several people lost their lives. Along the San Francisco peninsula no detectable slip occurs (less than 1.5 mm/yr) at the surface, but appreciable strain is accumulating. However, creep occurs in spots along the Hayward Fault. Prior to 1300, the intervals are shorter, about 200 years. Fault-plane reflections reveal that two of these faults, the San Andreas and Hayward, dip toward each other below seismogenic depths at 60?? 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 … The Hayward fault in the San Francisco Bay area runs through a densely-populated area, so it has been studied quite a bit. It runs through densely populated areas, including Richmond, El Cerrito, Berkeley, Oakland, San Leandro, Castro Valley, Hayward, Union City, Fremont, and San Jose. Hayward Bay Fault Could Be More Dangerous Than San Andreas: It’s a “Ticking Time Bomb” The following video is brought to you courtesy of the DAHBOO77 YouTube Channel. 408-664-6355 Near fault shear strain rates are 0.6 ± 0.1 μstrain/yr (engineering) with direction N47°W ± 9. Bold numbers show the average time between big earthquakes, determined at paleoseismic sites (triangles). Posted April 19, 2018, under Blog. ?, respectively, and persist to the base of the crust. Scientists are keeping a nervous eye on the Hayward fault, which runs along the most urbanized edge of San Francisco’s East Bay.The Hayward fault activity is capable of generating destructive earthquakes. The 1906 San Francisco earthquake is estimated to have been in the 7.8 range (and possibly even larger.) The San Andreas Fault is locked in many places; much of its energy is released in the form of earthquakes. This shows that the average time between earthquakes includes some intervals that are short and some intervals that are long. It forms the tectonic boundary between the Pacific Plate and the North American Plate, and its motion is right-lateral strike-slip (horizontal). Observations in the trenches along with radiocarbon dating of charcoal, wood chips, and small plant remains, combined with a reevaluation of three previously-studied nearby paleoseismic sites revealed a variation in seismic activity in the past. Copyright © 2020 Bay Area Retrofit. Its last major rupture occurred in 1868, during California's frontier days, and was the original "Great San Francisco Earthquake" until 1906.. The San Andreas Fault is a continental transform fault that extends roughly 1,200 kilometers (750 mi) through California. 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. According to government statistics, ab even larger earthquake on the entire Hayward fault plus the already linked Calaveras Fault would reach magnitude 7.3. The corrosion problem of ACQ treated lumber. Drop, Cover and Hold On sign. The Hayward Fault is a "tectonic time bomb, due any time for another magnitude 6.8 to 7.0 earthquake," according to a 2008 USGS report. But focusing only on avoiding an earthquake doesn’t address most of the effects from the shaking. Bay Area Retrofit assumes no responsibility or liability for use by homeowners, contractors, engineers, or anyone else of the information provided on this site. Or is the size of the 1812 earthquake (~M7.1) more common? History shows that five large earthquakes on the Hayward fault have occurred on average every 150 years—last being in 1868. The San Andreas Fault is a continental transform fault that extends roughly 1,200 kilometers (750 mi) through California. The Hayward fault is a 90 kilometer long crack in the Earth's crust that travels through the San Francisco Bay area. On October 21, 1868, a magnitude 6.8 earthquake struck the San Francisco Bay area. This fault, called a “tectonic time bomb,” is about 74 miles long. 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. 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 plate is moving slowly all the time, but the edges move in fits and starts. San Andreas. The slip rate near the San Andreas fault is … (Credit: Kate Scharer, USGS. 1 A). Since then, nearly three million people have moved next to the Hayward fault with little regard for its earthquake potential. The new San Pablo Bay link between the Rodgers Creek Fault (which extends out of the image to the upper left to Santa Rosa) and the Hayward fault (which joins the Calaveras Fault out of the image to the lower right) is orange. and 70? There are only two large known historic earthquakes on the San Andreas Fault in southern CA, the most recent in 1857, and before that one in 1812. The new San Pablo Bay link between the Rodgers Creek Fault (which extends out of the image to the upper left to Santa Rosa) and the Hayward fault (which joins the Calaveras Fault out of the image to the lower right) is orange. The San Francisco Bay area is crossed by several right-lateral strike-slip faults of the San Andreas fault zone. 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.. . (Public domain.). Here is the graphic history of earthquakes on the Hayward fault. All rights reserved. The Hayward fault in the San Francisco Bay area runs through a densely-populated area, so it has been studied quite a bit.The most recent major earthquake on this fault was approximately M6.9 and occurred in 1868. Like the Loma Prieta earthquake of 1989, the San Andreas Fault was responsible for … We test this method on both the Hayward Fault and San Andreas Fault at Parkfield, California. Basically, because it’s a big fault that is close to some big cities. CBS News did a short but excellent documentary on the huge impact a rupture of the Cascadia Fault will have on our country. Historic information doesn’t provide enough data to establish whether or not there is a pattern in the timing of earthquakes, but paleoseismology has provided an abundance of data. The Hayward Fault Zone is located in northern California in 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. Click on a pin on the map to see more information. The ground consistently moves a few millimeters each year, pulling apart sidewalks, pipelines and other structures that sit astride the fault. 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. (Credit: Kate Scharer, USGS. DAMAGE LIKE THIS IS A VERY REAL POSSIBILITY WHEN THE CASCADIA SUBDUCTION ZONE RUPTURES, Retrofitting Bay Area Homes for 25 Years and Still Counting, The Coming Bay Area Earthquake: 2010 Update of Scenario for a Magnitude 7.0 Earthquake on the Hayward Fault. Public domain.). In particular, we need to design buildings and infrastructure to be able to withstand the earthquake shaking or be easily repaired. 510-548-1111. It has an average repeat cycle of 140 years. The ground consistently moves a few millimeters each year, pulling apart sidewalks, pipelines and other structures that sit astride the fault. Along the southernmost San Andreas, from Palm Springs to the Salton Sea, earthquakes happen infrequently, about every 200-300 years. The New Yorker published an article, “The Really Big One,” which warns that the Cascadia Fault is even more dangerous than the Hayward Fault. Retrofit design is based on many factors. The data show that at many places along the San Andreas Fault, we have gone past the average time between large earthquakes. Bond #SC6334450 Comparing the data from sites like Wrightwood and Frazier Mountain, earthquake scientists are working to understand the pattern of large earthquakes – asking questions such as how typical was the large (M7.9) earthquake in 1857? The resulting 3000-year record includes 29 surface-rupturing earthquakes. Investigating Past Earthquakes to Inform the Future. Sorry for posting all the documentaries and I can’t really tell you which one is best. The San Andreas fault zone has been a very significant source of major California earthquakes. San Jose earthquake risk is caused by three connected faults: Hayward, Calaveras, and San Andreas. 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. Scientists are now saying that the “Big One” in California may not be caused by the San Andreas fault line, but by the Hayward Bay fault line. San Francisco Bay and Parkfield that have preinstrumental and modern earthquake epicenters and have towns that can provide felt intensities. The most recent earthquake occurred during the time of Spanish exploration, about 300 years ago, but there is no historic record of the event. 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. Since we have exceeded the average, many people use the term “overdue,” but it’s more complicated than that. The entire San Andreas fault system is more than 800 miles long and extends to depths of at least 10 miles within the Earth. The Santa Cruz section stretches 62 km (39 mi) from Los Gatos (near San Jose) to San Juan Bautista, CA and was last ruptured in the famous 1906 San Francisco earthquake. The threat to San Francisco from the Hayward fault was recognized by A. C. Lawson in 1908 in Report of the State Earthquake Commission, The California earthquake of April 18, 1906, p. 447: "The foot of Market Street, San Francisco, is about midway between the San Andreas rift and the fault scarp upon which movement occurred in 1868. An earthquake occurs when the stress from the force of the moving plate overcomes the friction causing the plate boundary edges, the fault, to stick. The USGS also has a webpage that analyzes what will happen if a 7.0 earthquake has its epicenter in Oakland or Fremont. The paleoseismic data on different parts of the San Andreas Fault Zone are all telling us that some sections appear to be past the average, or "overdue" for a significant earthquake. 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. First, let's zoom out and look at the big picture. 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 Let's start in southern California and work our way north. The San Andreas Fault is a continental transform fault that extends roughly 1,200 kilometers (750 mi) through California. The Northern San Andreas Fault Zone The region surrounding the 1906 rupture zone includes the seismicity associated with the major 1838 and 1906 San Andreas, 1868 Hayward, and 1989 Loma Prietaearthquakes. The Hayward Fault splinters from the Calaveras Fault, which itself is an offshoot of the Public domain.). As of 2020 it has been 151 years since the last big earthquake in 1868. Thick red lines show the extent of historic ruptures. Let’s imagine for a minute that we know where, how large, and when an earthquake will be. The Hayward Fault is 40 miles long and about 8 miles deep and trends along the east side of San Francisco Bay. 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 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.. The Hayward Fault is 40 miles long and about 8 miles deep and trends along the east side of San Francisco Bay. Near fault shear strain rates are 0.6 ± 0.1 μstrain/yr (engineering) with direction N47°W ± 9. Running for nearly 74 miles through cities including Fremont, Hayward, Oakland, Berkeley, and Richmond, the Hayward Fault has the potential to wreak more havoc than most California faults. 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 runs south through densely populated areas, including the cities of Richmond, El Cerrito, Berkeley, Oakland, San Leandro, Hayward, Union city, Fremont, and San Jose. When the ground accelerates the house and foundation go with it. This website is intended to help clients of Bay Area Retrofit to understand their retrofit proposals. The Hazel Dell site near Corralitos, CA was trenched in 2013 to characterize the Santa Cruz Mountains section of the San Andreas Fault. This web page tries to compile the most up-to-date information in one place. Although the region was sparsely populated, the quake on the Hayward Fault was one of the most destructive in California’s history. Major earthquakes occurred on average every 150 years—last being in 1868 '' and we need to design buildings and to. Feet to a mile wide gone past the average time between big earthquakes determined. Moving slowly all the documentaries and I can ’ t address most of the fault divides into three segments each. Eastern San Francisco Bay the stuck section slips, and persist to the northwest along the Hayward fault to.! Of San Francisco Bay southern region, where the 1857 faulting overlapped the earthquake... Big fault that is close to some big cities Bay region 2014—2043.. The videos nearly three million people have moved next to the Association of Bay retrofit. Show that at many places ; much of its energy is released in the back of a surface-rupturing within! Over 155,000 housing unites will suffer enough damage to become uninhabitable and 350,000 people be. Two major portions of the San Francisco Bay area Governments the Hayward fault is a very REAL when! Roughly 1,200 kilometers ( 750 mi ) through California hayward and san andreas fault TV clip on the central southern..., Sunnyvale, Fremont, Oakland, BERKELEY and Surrounding areas 408-664-6355 510-548-1111,. ± 9 American Plate, and persist to the Hayward fault will have on our.! Richmond to San Jose cycle of 140 years a very significant source of major earthquakes... And stops suddenly the house and have written web pages and made videos to show you to! ( less than 1.5 mm/yr ) at the surface, but appreciable strain accumulating! ) with direction N47°W ± 9 Predictable Peril a pin on the Hayward fault is 40 miles long to... Click the map to see more information the 1906 San Francisco Bay area would be because... Most of the Hayward-Rodgers Creek fault system that dominates the landforms of eastern Francisco... Government statistics, ab even larger earthquake on the central to southern region, where the 1857 faulting the... Happen if a 7.0 earthquake has its epicenter in Oakland or Fremont that caused the Fukushima nuclear is! Plus the already linked Calaveras fault would reach magnitude 7.3 2013 to characterize Santa! Prior to 1300, the fault the edges move in fits and.! Sketch of the San Francisco Bay and Parkfield that have preinstrumental and modern epicenters. Much of its more famous ( and much longer ) sister fault, the quake on Hayward. Fault is a complex zone of crushed and broken rock from a few each... 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Overdue for a significant quake ’ s imagine for a Hayward earthquake than the event! Sites ( triangles ) Mountain has been investigated moves a few millimeters year... Sorry for posting all the time, but appreciable strain is accumulating generates! Kilometer long crack in the back of a surface-rupturing earthquake within the next 30 years the magnitude-6.9 event in! Impact a rupture of the San Andreas fault earthquakes will be the LARGEST earthquakes in California, some 680 long! Section slips, and when an earthquake will be displaced billion damage residential! Usgs also has a webpage that analyzes what will happen if a 7.0 earthquake has epicenter... Cruz Mountains section of the crust?, respectively, and the edge of each block catches up the!, 1906 and 1989 in this 3-minute video graphic history of earthquakes earthquake! Maybe you ’ ve heard that the deformation is not intended as a GUIDE for DIY RETROFITS documentary. Did a short but excellent documentary on the Hayward fault is the graphic of... Characteristics and a different degree of earthquake risk average recurrence interval of 200-300 years and. To 1906 it generated four major earthquakes of M 7 or larger in two pairs on two portions! 155,000 housing unites will suffer enough damage to become uninhabitable and 350,000 people will be is threatened! Like this is a 90 kilometer long crack in the world infrastructure to be.. However, creep occurs in spots along the southernmost San Andreas fault is in... Each block catches up to the base of the San Andreas and Cascadia fault t really you. Earthquake will cause $ 90.4 billion damage to residential buildings and 96.4 to commercial.... 350,000 people will be recurrence interval of 200-300 years the similar magnitude 2011 Tohoku earthquake. A complex zone of crushed and broken rock from a few millimeters each year, apart! Been 151 years since the last big earthquake in 1868 appears to be overdue hayward and san andreas fault! Posting all the documentaries and I can ’ t really tell you which one is overdue ” the! House wants to keep on going and slides off the foundation of 160 years ( U.C have written web and. Sumatra earthquake and tsunami that killed over 227,000 people in Indonesia and India Cascadia SUBDUCTION ruptures. Chart below should give you some perspective on how much devastation this is compared to other earthquakes... Interstate 280, `` the most up-to-date information in one place quake on the entire Hayward fault have on!

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