. Services. On Oct. 21, 1868, a major quake struck on the East Bay's Hayward Fault. Geometry and Evolution of the Hayward Fault. Earthquake Overview of Hayward in 1868 The Fault The Hayward Fault runs from Fremont, north through Berkeley, and ends somewhere in San Pablo Bay. It was approximately a magnitude 6.9. 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. 2nd Alameda Co. Afterward, the county seat moved to Oakland. Although the region was sparsely populated, the quake on the Hayward Fault was one of the most destructive in California’s history. The fault roughly follows the hills, but it does go through several cities. 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. . ] The 1868 Hayward earthquake and more recent analogs such as the 1995 Kobe earthquake are stark reminders of the awesome energy waiting to be released from below the east side of the San Francisco Bay along the Hayward Fault. Population of Hayward in 1870 was 500 inhabitants, today there are 140,000, over 277 times more residents. Major earthquake faults in the San Francisco Bay region. Until 1906, the 1868 earthquake was considered the "Great Earthquake." Forget Cascadia and San Andreas: A Hayward fault megaquake could cause 'greatest natural disaster ever to hit the US', warn experts. Therefore, all residents of the East Bay must be aware of the hazard that lies below their feet. Geophysical data along the Hayward Fault are used to investigate the nature, spatial relationship, and evolution of the Hayward Fault Zone. There is a 3 out of 4 chance of a damaging earthquake in the Bay Area in the next 30 years. 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). Ruins of the Alameda County courthouse in San Leandro, after an earthquake on the Hayward Fault on October 21, 1868. We estimate slip in the 1868 earthquake by analyzing triangulation data collected between 1853–1860 and 1876–1891. The Seismological Society of America is commemorating this event by creating a virtual special issue of BSSA. In contrast to many other moderate-to-large historical events, the causative fault is clearly established. Although many reports and on-line resources have been compiled about the science and engineering associated with earthquakes on the Hayward Fault, this report has been prepared to serve as an … This difference is mainly due to the fact that a large earthquake last occurred on the Hayward Fault in 1868, and because the interval between the last five major quakes is 140 years (This year is the 150th anniversary of the 1868 quake). Dot size indicates the present relative population sizes of cities. earthquake? 2008. The fault broke for about 30 miles from around Milpitas to the Oakland-Berkeley border. Date Taken: 2018 (approx.) The fault slipped 3 to 6 feet along the fault. The western side moved north and the eastern side moved south. During the 1868 earthquake, the southern end of the fault ruptured, sending seismic shock waves throughout the region. 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). This field-trip guidebook was compiled to help commemorate the 140 th anniversary of an estimated M 7.0 earthquake that occurred on the Hayward Fault at approximately 7:50 AM, October 21st, 1868. Image Dimensions: 590 x 662. Hayward Fault and 1868 Earthquake Virtual Special Issue. By Thomas M. Brocher, Jack Boatwright, James J. Lienkaemper, Carol S. Prentice, David P. Schwartz, and Howard Bundock. Watch the Video Predicted Effects & Impact of a Major Hayward Fault Earthquake. RE: The Hayward Fault [ or the San Andreas or the Cascadia Subduction Zone (CSZ) or the . The 21 October 1868 Hayward, California, earthquake is among the best-characterized historical earthquakes in California. 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. Earthquake Science Zones: There will be two sites that people could ask scientists and educators about the science behind the Hayward Fault. In 1868 the 6.8-magnitude Hayward earthquake on the Hayward Fault collapsed buildings throughout the Fremont area, ruining Mission San José and its outbuildings. Securing the homeland through the power of information. Historically, at least one, and probably two, major earthquakes (about M 6.8) occurred along the Hayward fault, one in 1836 and another in 1868. The Fault The Hayward Fault runs from Fremont, north through Berkeley and ends somewhere in San Pablo Bay. 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. The Hayward Fault—Is It Due for a Repeat of the Powerful 1868 Earthquake? It makes up one of the larger faults within the San Andreas Fault System, and has a history of large, damaging earthquakes. The East Bay experiences the 1868 Hayward Fault Earthquake. Details. View east towards Hayward before the 1868 Earthquake, showing how few people lived there at the time. The Hayward Fault runs through the San Francisco suburb of Hayward, California. 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. 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. In Fremont, the fault is marked by the ponds next to the BART station. Courthouse, San Leandro. No other large historic earthquake has been unequivocally assigned to the Hayward fault. Hayward Fault and 1868 Earthquake Special Collection. In Fremont, the fault is marked by the ponds next to the BART station. The 1868 earthquake on the Hayward Fault capped a decade-long sequence of seven increasingly strong quakes in the Bay Area. Alerts and Subscriptions Critical Releases in Homeland Security Ask a Librarian. On October 21, 1868, a magnitude 7.0 earthquake occurred on the Hayward Fault in the East Bay. . Magnitude 6.5-7.0, occurred on the southern end of the larger faults within the San Francisco, southern... 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