It is among the most active faults and seismologists warn it will likely be the source of the next "big one" in San Francisco-Bay Area. This creates an uplift of the East Bay hills in the Fremont area exposing the rocks of the Briones Formation, which is a fossilerous rock made of marine shells. The cracking of the ground along the Hayward Fault was traced about 20 miles (32 km) from San Leandro to Warm Springs in Fremont, although modeling of survey data suggest that the fault moved as far north as Berkeley, and from these data the average amount of horizontal movement along the fault is inferred to be about 6 feet (1.9 meters). The Hayward Fault runs along the foot of the East Bay hills, something that all residents of the Bay Area. Parts of a Fault. The Hayward Fault and the 1868 Earthquake. The cracking of the ground along the Hayward Fault was traced about 20 miles (32 km) from San Leandro to Warm Springs in Fremont, although modeling of survey data suggest that the fault moved as far north as Berkeley, and from these data the average amount of horizontal movement along the fault is inferred to be about 6 feet (1.9 meters). A fault is a fracture or zone of fractures between two blocks of rock. The Hayward Fault splinters from the Calaveras Fault, which itself is an offshoot of the It is a member of the San Andreas Fault system that runs from the Gulf of California in the south, to Cape Mendocino in the north. The USGS map of the fault trace shows the specific features of the fault here. per year (about how fast your fingernails grow). The Hayward Fault has ruptured about every 140 years for its previous five large earthquakes. The Hayward Fault is the single most urbanized earthquake fault in the United States—in 1868 there were only 24,000 residents living in Alameda County; now there are more than 2.4 million people. (Play Video), Cooperative Institute for Deep Earth Research (CIDER), Northern California Earthquake Data Center (NCEDC), Official Maps of Earthquake Fault Zones throughout California, Official Seismic Hazard Zone Maps throughout California. New Study Finds Hayward Fault More Dangerous Than San Andreas. The San Andreas Fault system forms the boundary between the North American and the Pacific tectonic plates. All Rights Reserved. Soft, water saturated sands and sediments amplify shaking even at great distances from an earthquake, while bedrock shakes to a much lesser extent. 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. Earthquake country just got a little scarier. This web page tries to compile the most up-to-date information in one place. ... What type of plate boundary is closest to it? The Hayward Fault is a strike-slip fault on the surface but changes to a low angle thrust fault as it descends under the Easy Bay Hills. It runs through densely populated areas, including Richmond, El Cerrito, Berkeley, Oakland, San Leandro, Castro Valley, Hayward, Union City, Fremont, and San Jose. Major active faults such as the Hayward Fault are associated with many hazards. Strike-slip faults have walls that move sideways, not up or down. In addition, there are numerous documents on the State of California's Department of Conservation website that give lots of useful information. This event marked the end of a period of severely reduced creep on the southern part of the fault that began after the 1989 Loma Prieta, California, earthquake. Joyce Blueford and Mitch Craig lead NCGS members, family, and the general public on a field trip to examine evidence of the Hayward Fault in the East Bay. On April 15, 2006, Drs. Nearly all transform faults are in the deep sea, but the major ones on land are noteworthy and dangerous, such as … The Hayward Fault Zone derived its name from the city of Hayward in the San Francisco Bay Area. convergent. It is a right-lateral strike-slip fault, meaning that motion along it is mainly horizontal, so that objects on the opposite side of the fault from the viewer will move to … According to experts, this fault causes a major earthquake, on average, approximately every 140 years. This means that it shows its everyday action in the form of aseismic creep, the slow, steady sliding of land along the fault’s margin. The last major earthquake on the Hayward Fault, with magnitude 6.5-7.0, occurred on October 21, 1868. This fault is about 74 mi (119 km) long, situated mainly along the western base of the hills on the east side of San Francisco Bay. The Hayward Fault runs through portions of Fremont and Union City. To share this video via email, copy and paste the message and URL below into your favorite email client and send. Are you, your family, and your business prepared to outsmart disaster? This movement causes stress, which results in earthquakes. This is what happens when the ground starts to shake. Posted April 19, 2018, under Blog. NCGS Commemorates the 1906 Great Earthquake by Walking…the Hayward Fault! This movement may occur rapidly, in the form of an earthquake - or may occur slowly, in the form of creep. Contributed by Dale Smith Photos by Phil Garbutt. 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In order to better understand mechanisms of active faults, we studied relationships between fault behavior and rock units along the Hayward fault using a three-dimensional geologic map. In 1996, an 18-millimeter creep event, the largest ever observed on the Hayward fault, occurred between surveys 63 days apart. The Hayward Fault is a strike-slip fault on the surface but changes to a low angle thrust fault as it descends under the Easy Bay Hills. A new report from the USGS says the biggest danger may be the Hayward Fault, because 2 million people live directly on top of it, including the cities of Oakland and Berkeley. The most obvious hazard is that of large earthquakes, which induce ground shaking over a large area that can cause heavy objects to fall and windows to shatter, and can cause structural damage to buildings and bridges. The Hayward Fault Zone is a geologic fault zone capable of generating destructive earthquakes. The Hayward fault is not our only fault. The Hayward Fault is a major earthquake fault that runs for nearly 45 miles (72 km) through the East Bay of the San Francisco Bay region. convergent. Locate the Hayward fault. Picture via USGS. With the last strong earthquake in 1868 and more than a dozen pipelines already An example of a dip-slip or transform fault is the San Andreas fault in California. The Hayward Fault is a Strike-slip Fault. These four fault structures are some of the major faults in California at the latitude of San Francisco. 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. It is a right-lateral strike-slip fault, meaning that motion along it is mainly horizontal, so that objects on the opposite side of the fault from the viewer will move to … Between the San Andreas Fault and the Calaveras Fault lies the Hayward Fault, which diverges from the Calaveras Fault east of San Jose, California. The Hayward Fault is thought capable of generating a magnitude 7.5 quake. 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. Copyright © 2020 UC Regents; all rights reserved, Explore the science behind a simulation of a magnitude 7 earthquake on the East Bay's Hayward Fault and learn what it could mean for shaking potential in your area. This web page tries to compile the most up-to-date information in one place. The Hayward Fault has a strike-slip motion which is when one land mass moves, nearly horizontally in the opposite direction of the other on the surface. The largest earthquakes recorded on the San Andreas fault include the 1906 San Francisco earthquake (approximately magnitude 7.8) and the 1989 Loma Prieta earthquake … The Hayward fault is a transform or strike-slip fault that moves sideways, rather than the more common faults that move up on one side and down on the other. High disruption of structures, roads, and utilities. It suggests that either the fault is creeping there, or there has been recent seismic slip.” In fact, according to Watt et al., even the most recent prehistoric earthquakes along the Rodgers Creek fault and Hayward faults, which struck sometime between 1715 and 1776, could have been a single combined event given dating uncertainties. Faults consist of two rock blocks that displace each other during an earthquake or regular tectonic movement. How does the COVID-19 vaccine get to a hospital near you? The net effects of these are often more severe and more widespread than the damage directly caused by the shaking itself, and they complicate emergency response and clean-up.Faults, however, can also cause damage in much less noticeable and long term way through creep. But at its northern end, at Point Pinole Regional Shoreline, the fault can be walked and traced across open land with trees and grass. A section of sidewalk in Hayward that showed the movement of the Hayward Fault was 'fixed' by the city, much to the dismay of geologists. 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 first is its location in the urban heart of the Bay Area. Two factors combine to make the Hayward Fault very dangerous. Think: Have any Mw 9 quakes occurred on any other type of plate boundary? The Hayward Fault is a major earthquake fault that runs for nearly 45 miles (72 km) through the East Bay of the San Francisco Bay region. SAN FRANCISCO (KGO) -- While the San Andreas fault gets much of the attention after the devastating 1906 and 1989 quakes, it's the Hayward fault, which runs along the East Bay, that quake experts consider the most dangerous fault in America. ... the site’s distance from the fault, and the type of geologic material at the site. Think: Have any Mw 9 quakes occurred on any other type of plate boundary? The most obvious hazard is that of large earthquakes, which induce ground shaking over a large area that can cause heavy objects to fall and windows to shatter, and can cause structural damage to buildings and bridges. What is likely to be the effect on the East Bay when it ruptures? 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. Faults may range in length from a few millimeters to thousands of kilometers. What if...A 7.0 earthquake hit the San Francisco Bay Area? Strike-Slip Faults. Strong shaking and fault rupture can also lead to many other problems, including landsliding, liquefaction, fires, disrupted transportation routes, broken water and gas pipes, downed electrical and phone lines, and many other dangerous conditions. It is among the most active faults and seismologists warn it will likely be the source of the next "big one" in San Francisco-Bay Area. The northern segment of the Hayward Fault stretches between San Pablo Bay and southern Oakland, and if that segment alone should break, then … It is located within its central section, between the latitudes of San Jose and Bakersfield. Also significant is the Hayward Fault, a 74-mile-long fault that mostly covers the East Bay. To find out more about the potential hazards from an earthquake in the Bay Area, or about the specific area that you live in, the USGS has several great Google Earth maps that show: likeliness of a damaging earthquake, liquefaction likeliness, at risk areas, and potential hazards for our infrastructure. 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