High disruption of structures, roads, and utilities. High disruption of structures, roads, and utilities. This movement causes stress, which results in earthquakes. 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. Different faults in the Bay Area and the probabilities for each one producing a magnitude 6.7 or greater earthquake. Copyright © 2020 KGO-TV. What is likely to be the effect on the East Bay when it ruptures? The last major earthquake on the Hayward Fault, with magnitude 6.5-7.0, occurred on October 21, 1868. The Hayward fault is not our only fault. Are you, your family, and your business prepared to outsmart disaster? According to experts, this fault causes a major earthquake, on average, approximately every 140 years. 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 is what happens when the ground starts to shake. An example of a dip-slip or transform fault is the San Andreas fault in California. Nearly all transform faults are in the deep sea, but the major ones on land are noteworthy and dangerous, such as … You’ll see things marked in the area just south of the zoo, a length of the fault labeled “G1, sl” and a dotted oval marked “G1, df.” G1 means a geomorphic feature (a landform) of “strongly pronounced” character, the most clear-cut kind of evidence. Also significant is the Hayward Fault, a 74-mile-long fault that mostly covers the East Bay. Click for more detail. The last major earthquake on the Hayward Fault, with magnitude 6.5-7.0, occurred on October 21, 1868. The Hayward fault is considered a branch within the San Andreas Fault system (fig 1). Soft, water saturated sands and sediments amplify shaking even at great distances from an earthquake, while bedrock shakes to a much lesser extent. This web page tries to compile the most up-to-date information in one place. The Hayward Fault Zone derived its name from the city of Hayward in the San Francisco Bay Area. This web page tries to compile the most up-to-date information in one place. 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. To the east lies the Clayton-Marsh Creek-Greenville Fault. Locate the Hayward fault. These four fault structures are some of the major faults in California at the latitude of San Francisco. ... What type of plate boundary is closest to it? 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. 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. It splays to the east and trends between N. 20° and 35°W along some 119 km. (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. 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. Faults allow the blocks to move relative to each other. The San Andreas Fault system forms the boundary between the North American and the Pacific tectonic plates. 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. It is located within its central section, between the latitudes of San Jose and Bakersfield. 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. What is likely to be the effect on the East Bay when it ruptures? Damage in San Francisco from the 1989 Loma Prieta earthquake. The Hayward Fault is a Strike-slip Fault. Earthquake country just got a little scarier. 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. 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. This movement may occur rapidly, in the form of an earthquake - or may occur slowly, in the form of creep. 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 … COVID-19 holiday risk: The safest and most dangerous activities, Bay Area Life; Sundays at 6:30 p.m. on ABC7, 'The Earthquake Effect' provides in-depth coverage on Bay Area's readiness for the next major earthquake, The catastrophic fall and slow rise of the Bay Bridge after Loma Prieta, Scientists call San Francisco Bay Area 'Tectonic Time Bomb', MAP: Significant San Francisco Bay Area fault lines and strong earthquakes, From the Archives: ABC7's Peabody Award winning coverage of 1989 Loma Prieta Earthquake, What to pack in your earthquake emergency kit, Prepare NorCal: Disaster Preparedness Resources, Pet preparedness: How to keep your furry babies safe during a disaster or emergency, Most powerful earthquakes in California history above 7.0 magnitude, Earthquake scale: How they are measured and what the magnitude and intensity scales mean, What is an earthquake? It runs through densely populated areas, including Richmond, El Cerrito, Berkeley, Oakland, San Leandro, Castro Valley, Hayward, Union City, Fremont, and San Jose. The Hayward Fault runs through portions of Fremont and Union City. NCGS Commemorates the 1906 Great Earthquake by Walking…the Hayward Fault! 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 … What if...A 7.0 earthquake hit the San Francisco Bay Area? The Hayward fault, for instance, moves at a rate of about 0.2 in. ... the site’s distance from the fault, and the type of geologic material at the site. New Study Finds Hayward Fault More Dangerous Than San Andreas. 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. 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. Contributed by Dale Smith Photos by Phil Garbutt. The Hayward Fault and the 1868 Earthquake. 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. Think: Have any Mw 9 quakes occurred on any other type of plate boundary? A fault is a fracture or zone of fractures between two blocks of rock. Between the San Andreas Fault and the Calaveras Fault lies the Hayward Fault, which diverges from the Calaveras Fault east of San Jose, California. 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. 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. Think: Have any Mw 9 quakes occurred on any other type of plate boundary? The Hayward Fault is thought capable of generating a magnitude 7.5 quake. 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. convergent. 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. per year (about how fast your fingernails grow). Major active faults such as the Hayward Fault are associated with many hazards. 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