fault zone is considered to be the most probable source of a major earthquake in the San Find out if you are near the Hayward Fault.
Additionally, EBMUD created a second route to bring water to these west-of-the-hills customers through the Southern Loop Bypass near Castro Valley. The western boundary of the zone is less clearly defined, because the alluvium The UCERF3 represents the best available science to date, and it now considers "multifault ruptures" and "fault readiness", in addition to historical seismicity, in the calculus of earthquake forecasting. Of primary concern with respect to the Hayward Fault is the huge Chevron Richmond Refinery in Richmond. (See the Virtual tour – Google Earth Flyover below.). Fremont Earthquake Exhibit: The Hayward Fault Exposed, This geotourism exhibit (April through October 2006, now closed) featured a 12- to 15-foot (5 m) deep pit exposing the Hayward Fault, which could be viewed "face to face" from a shaded platform by descending a staircase. Many modifications have been made to freeway structures to reduce life hazards during seismic events. The forces associated with the fault have pushed up the East Bay hills on the east and dropped down the San Francisco Bay block on the west. The upshot, for those who live in the San Francisco Bay Area, is that experts say there is a 72% chance of experiencing a magnitude 6.7 or greater earthquake in the next 30 years. The Hayward Fault—Is It Due for a Repeat of the Powerful 1868 Earthquake?  Recent renovations of the Meek Mansion have revealed that with the 1868 earthquake still fresh in minds of residents of the time, some unusual diagonal bracing was built into the original construction. More than 2.4 million people live on or close to the Hayward Fault. As part of this project, that tunnel – the Claremont Tunnel – was seismically retrofitted. , In 2012, USGS scientists said the fault is due for another magnitude 6.8 to 7.0 earthquake, with the California Geological Survey concurring, stating they believe there is a 31 percent chance of a magnitude-6.7 earthquake or greater along the Rogers Creek-Hayward Fault in the next 30 years. 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. Each oval outer section carries two inner train tubes of circular cross section and a central rectangular access and rescue tunnel, with the void between elements filled with concrete. A major route for commuters traveling from Southern Alameda County, the San Joaquin Valley and the East Bay hills to downtown Oakland and San Francisco, Interstate 580 crosses the fault twice, and runs very close to the fault between the intersections with State Route 13 (the Warren Freeway) and Interstate 238. Geology, Minerals, Energy, and Geophysics Science Center The mapped traces represent the integration of the following three different types of data: (1) geomorphic expression, (2) creep (aseismic fault slip),and (3) trench exposures. The Hayward fault is a 90 kilometer long crack in the Earth's crust that travels through the San Francisco Bay area. Foundation and soft story weaknesses are easily remediated in most cases, but this is only effective if the work is competently done, with proper attention to minor details such as nailing patterns and proper connections. Reverse, Strike-Slip, Oblique, and Normal Faults, Introduction to Convergent Plate Boundaries, A History of the 1906 San Francisco Earthquake and Fire, B.A., Earth Sciences, University of New Hampshire. The Hayward fault zone is truncated to the south by the
 Extensive reconstruction work at the Hayward Fault crossing includes a multi-sectioned tunnel structure to allow shear without collapse, this is to contain a section of water pipe with ball joints and a slip joint. In addition to direct damage the effects on commerce due to damaged infrastructure would also be substantial. Some of the cities in the eastern bay shore and south bay region near this fault include Richmond, El Cerrito, Berkeley, Albany, Emeryville, Kensington, Oakland, Piedmont, San Leandro, San Lorenzo, Castro Valley, Hayward, Union City, Fremont, Newark, Milpitas, Niles, and portions of San Jose. Watch the video or scroll through the interactive map to see what sits right on the Hayward fault. 4. Modified train scheduling to prevent multiple train exposure at faults has been determined by BART engineers to be impractical due to variations in train passage, but automated event-related realtime train operational response is considered practical (see below). As with portions of other faults, a large extent of the Hayward Fault trace is formed from a narrow complex zone of deformation which can span hundreds of feet in width.
The Tom Wolfe novel A Man in Full features a fictional major earthquake on the Hayward Fault as a deus ex machina method (freeing a major character from prison) and plot development point. All Rights Reserved. During the reconstruction, the Cal Bears have played at AT&T Park in San Francisco for one season. The west side moves north with each major earthquake on it. In June 2006 Bay Area Rapid Transit (BART) management announced that they have elected not to modify the Berkeley Hills Tunnel, which actually penetrates the Hayward Fault, arguing that it would be cheaper (and less disruptive to current operations) to rebore a misaligned portion after the fact than to protect riders (either by extensive modifications of the tunnel or by replacing it with a higher bore) against the small likelihood that a train (or two) would crash into or be cut in two by a major slippage of the fault. In its northern extent, the Hayward Fault lies directly beneath the portion of Highway 13 (the Warren Freeway) that is south of its intersection with Highway 24 and north of its terminal connection with Interstate 580 (the MacArthur Freeway). The Hayward fault is an extremely interesting feature of the East Bay and you can see its footprints all over the place once you know where and how to look. Such areas may be stable only under present conditions. The Hayward fault is an extremely interesting feature of the East Bay and you can see its footprints all over the place once you know where and how to look. Many structures near the bay shore on either side would probably be severely affected by either a major Hayward Fault rupture or a nearby San Andreas Fault rupture. Extreme southern regions of the fault are creeping more quickly, perhaps sufficiently to prevent fault rupture there, but mostly the creep is insufficient to relieve the accumulating forces upon most of the fault and so will not prevent a large earthquake.
You can look at numerous pictures along the fault as well as view the actual fault path, all with beautiful satellite images! Nonetheless, Bay area cities and counties have long expected a major earthquake and as a result all building in the past 30 years has been required to adhere to strict guidelines regarding earthquake resistance. Combined Rodgers Creek and northern Hayward fault slip, magnitude 7.1, Northern Hayward fault slip, magnitude 6.5 *, Southern Hayward fault slip, magnitude 6.7 *. The Pacific Plate is a major section of the Earth's crust, gradually expanding by the eruption of magma along the East Pacific Rise to the southeast. The transbay tube terminates at an under-bay slip joint near the Embarcadero Station in San Francisco. Fault creep since 1923 offset the original walls at the north and south ends 13 inches (33 cm).
, East Bay Municipal Utility District (EBMUD) supplies water to 800,000 East Bay customers who live west of the Berkeley Hills. or through the alluvium, the western boundary of the fault is generally considered to be the What are the Different Kinds? Similar trench excavations are used in the determination of the frequency and magnitude of prehistoric earthquakes and to determine the location of latent faults as part of the science of Paleoseismology. The creep is sufficient to displace roads, curbs, and sidewalks and so visibly reveal the surface trace in many locations. Geologic Faults What Is It? A simultaneous rupture of the connected Hayward-Rodgers Creek Fault – about 118 mi (190 km) long from just north of Healdsburg down to Alum Rock in San Jose – could result in a major earthquake of magnitude 7.4 that "would cause extensive damage and loss of life with global economic impact". 2021 (Working Group on California Earthquake Probabilities, 1990). Because of the high urban density of the area, it runs through and the gap in time between its most recent rupture, it is considered one of the most hazardous faults in the world. Part or all of this report is presented in Portable Document Format (PDF). USGS. Learn how your comment data is processed. The Association of Bay Area Governments has prepared ground shaking maps that include a possible concurrent scenario (these are shown below).
million or more years. by the Rodgers Creek and Tolay faults. Recent estimates of the damage potential of a major Hayward Fault earthquake by a professional risk management firm indicate the potential for huge economic losses, of which only a small percentage is insured against earth movement. As the bulk of cargo containers from the Port of Oakland travel on these two roads, the disabling of both would cause severe disruption of West Coast import and export goods, owing to the consequent overloading of other West Coast container handling ports. The Hayward All of the faults within the southern part of the zone probably splay into the The San Francisco Bay Area is vulnerable to damaging earthquakes. Water could be cut off to 2.4 million people living in California's San Francisco Bay Area.
It’s capable of producing quakes ranging from 7.0 to 8.0 in magnitude. While there are indications that a substantial earthquake on a nearby parallel fault can release stress and so also decrease the near-term probability of an earthquake, the opposite appears to be true concerning sequential segments. It occurred on the southern segment of the fault, receiving its name (some decades later) from the nascent town of Hayward where it was determined the quake's epicenter was located. Geologic Map of the Hayward fault zone, Contra Costa, Alameda, and Santa Clara Counties, California: A digital database By R.W. Extensive additional interpretive material concerning the geology and seismology of the Bay Area was presented for viewing, most of which is currently accessible online.
This page was last edited on 23 August 2020, at 21:45. However, the University has undertaken an extensive retrofitting project over the past decade to systematically retrofit all academic buildings on Campus to withstand a significant earthquake. Funding and organization for a permanent exhibit at this location is being actively sought, with planning in progress. This is to be corrected at great expense – first estimated at $142 million but expected to cost far more – probably the largest single cost item in the list of BART seismic retrofits.
The Seismic Hazard Mapping Program addresses the secondary earthquake hazards of liquefaction (the inability of water-saturated, heavily shaken soil to support structures) and landslides. westernmost mapped fault, which corresponds more or less with the margin of thick Motion over millions of years has brought different sets of rocks next to each other on the fault trace.
An earthquake may cause minor landsliding on some slopes of the freeway, and the plastic movement of the fill would likely disrupt the pavement if the movement here of the surface displacement is substantial, possibly presenting a hazard to motorists and shutting down the highway for a while.
http://geomaps.wr.usgs.gov/gmeg/. In 2007, the Hayward Fault was discovered to merge with the Calaveras Fault east of San Jose at a depth of 4 miles (6.4 km), with the potential of creating earthquakes much larger than previously anticipated.