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hayward fault earthquake 1868

. The M 7 October 21, 1868 Hayward fault earthquake produced a 30-to-40-km-long surface rupture, and slip of up to 2 m may have extended at depth from Warm Springs to near Berkeley [Yu and Segall, 1996]. Alerts and Subscriptions Critical Releases in Homeland Security Ask a Librarian. . ] The fault roughly follows the hills, but it does go through several cities. Therefore, all residents of the East Bay must be aware of the hazard that lies below their feet. 1868 Hayward Earthquake: 140-Year Retrospective: RMS Special Report; HSDL search results for: Hayward Fault Earthquake; Access. Earthquake Science Zones: There will be two sites that people could ask scientists and educators about the science behind the Hayward Fault. Major earthquake faults in the San Francisco Bay region. The city was devastated early in its history by the 1868 Hayward earthquake. It makes up one of the larger faults within the San Andreas Fault System, and has a history of large, damaging earthquakes. We have documented a chronology of 11 paleoearthquakes on the southern Hayward fault (HS) preceding the Mw6.8, 1868 earthquake. The fault slipped 3 to 6 feet along the fault. The Hayward Fault runs through the San Francisco suburb of Hayward, California. . ] Hayward Fault Shake Map. A repeat of the 1868 earthquake on the Hayward Fault would produce strong shaking throughout the San Francisco Bay Area with shaking ranging from strong to very strong in the cities of Hayward, San Leandro, and Fremont. A lesser-known cousin of the San Andreas Fault, the Hayward Fault is a crack in the earth’s crust up to 20 miles deep that stretches roughly 70 miles from San Pablo Bay in the north to Fremont and Milpitas at its southernmost end. No other large historic earthquake has been unequivocally assigned to the Hayward fault. . October 21, 2008, will mark the 140th Anniversary of the 1868 Hayward Earthquake, variously estimated to have had a magnitude between 6.8 and 7.0. In Fremont, the fault is marked by the ponds next to the BART station. earthquake? Date Taken: 2018 (approx.) By Thomas M. Brocher, Jack Boatwright, James J. Lienkaemper, Carol S. Prentice, David P. Schwartz, and Howard Bundock. Securing the homeland through the power of information. The last big earthquake along the Hayward Fault was in 1868. The 21 October 1868 Hayward, California, earthquake is among the best-characterized historical earthquakes in California. We estimate slip in the 1868 earthquake by analyzing triangulation data collected between 1853–1860 and 1876–1891. The Hayward Fault runs through the San Francisco suburb of Hayward, California. Details. 2008. The population at risk from a Hayward Fault earthquake is now 100 times larger than in 1868. Intensity Maps for the 1868 Hayward Earthquake. The Fault The Hayward Fault runs from Fremont, north through Berkeley and ends somewhere in San Pablo Bay. Until 1906, the 1868 earthquake was considered the "Great Earthquake." October 21, 2008 marks the 140th anniversary of the 1868 Hayward earthquake, which was the first great “San Francisco earthquake” and one of the most damaging earthquakes in the nation's history. On October 21, 1868, a major earthquake on the Hayward Fault ruptured a section of the fault from the location of present -day Fremont to just north of Oakland (Yu and Segall, 1996). Geophysical data along the Hayward Fault are used to investigate the nature, spatial relationship, and evolution of the Hayward Fault Zone. During the 1868 earthquake, the southern end of the fault ruptured, sending seismic shock waves throughout the region. There is a 3 out of 4 chance of a damaging earthquake in the Bay Area in the next 30 years. On Oct. 21, 1868, a major quake struck on the East Bay's Hayward Fault. Modified Mercalli Intensity maps for the Hayward earthquake plotted in ShakeMap format. The last major earthquake on the Hayward Fault, with magnitude 6.5-7.0, occurred on October 21, 1868. Luke Blair and Susan Garcia (both from the U.S. Geological Survey showcased the "Faulted Floor" where 60 years of "creep" along the Hayward Fault can be seen. These large earthquakes were both regular and frequent, as indicated by a 0.40 coefficient of variation and mean recurrence interval (MRI) of 161 ± 65 yr (1σ of recurrence intervals). On October 21, 1868, a magnitude 6.8 earthquake struck the San Francisco Bay area. The “Shake Map” at right shows the shaking intensities expected for a hypothetical scenario earthquake (magnitude 6.7) on the southern Hayward Fault, which last ruptured in 1868 in an event of magnitude about 6.9. Published magnitude estimates have been fairly consistent, ranging from 6.8 to 7.2, with 95% confidence limits including values as low as 6.5. The fault roughly follows the hills, but it does go through several cities. The Hayward Fault extends from San Pablo Bay where it joins up with the Rodgers Creek Fault, to south of San Jose, where it merges with the Calaveras Fault, a length of 140 mi (230 km). Earthquake Overview of Hayward in 1868 The Fault The Hayward Fault runs from Fremont, north through Berkeley, and ends somewhere in San Pablo Bay. Society of California Pioneers. Field Guides. Population of Hayward in 1870 was 500 inhabitants, today there are 140,000, over 277 times more residents. The U.S. Geological Survey (USGS) is releasing a new map showing the shaking produced by the 1868 Hayward earthquake, the 12th most deadly earthquake in U.S. history. During the 1868 earthquake, the southern end of the fault ruptured, sending seismic shock waves throughout the region. … Richard has spoken on both the 1868 and 1906 Earthquakes scores of times and can customize the presentation to a specific audience or local focus. The Hayward Fault Zone is a geologic fault zone capable of generating destructive earthquakes.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.It runs through densely populated areas, including Richmond, El Cerrito, Berkeley, Oakland, San Leandro, Castro Valley, Hayward, Union City, Fremont, and San Jose. On October 21, 1868, a magnitude 7.0 earthquake occurred on the Hayward Fault in the East Bay. Hayward Fault runs across photo near base of the escarpment below Hayward Hotel . These scenarios are larger than the magnitude 6.8 Hayward 1868 earthquake, but are about as likely to occur because there has not been a large earthquake on the northern portion of the Hayward fault for about 300 years. Dot size indicates the present relative population sizes of cities. The western side moved north and the eastern side moved south. The jolt reached across the Bay and caused extensive damage in San Francisco, the region's largest city, so the name stuck. Image Dimensions: 590 x 662. Despite the importance of the Hayward fault for earthquake hazards in the San Francisco Bay area, neither the rupture length nor the average coseismic slip in the most recent major earthquake, which occurred in 1868, is well known. The 1868 earthquake on the Hayward Fault capped a decade-long sequence of seven increasingly strong quakes in the Bay Area. The fault broke for about 30 miles from around Milpitas to the Oakland-Berkeley border. October 21, 2018 marks the 150th anniversary of the 1868 Hayward earthquake, which was the first great “San Francisco earthquake” and one of the most damaging earthquakes in U.S. history. —Is it overdue for a repeat of the powerful 1868 [ , 1906, 1700, or . RE: The Hayward Fault [ or the San Andreas or the Cascadia Subduction Zone (CSZ) or the . 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