Intensity Maps for the 1868 Hayward Earthquake. Securing the homeland through the power of information. In Fremont, the fault is marked by the ponds next to the BART station. The Hayward Fault runs through the San Francisco suburb of Hayward, California. Until 1906, the 1868 earthquake was considered the "Great Earthquake." We have documented a chronology of 11 paleoearthquakes on the southern Hayward fault (HS) preceding the Mw6.8, 1868 earthquake. Earthquake Overview of Hayward in 1868 The Fault The Hayward Fault runs from Fremont, north through Berkeley, and ends somewhere in San Pablo Bay. In contrast to many other moderate-to-large historical events, the causative fault is clearly established. 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. Source: 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. 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). The Hayward fault is considered the most likely source of one or more major earthquakes in the San Francisco Bay area in the next few decades. Earthquake Science Zones: There will be two sites that people could ask scientists and educators about the science behind the Hayward Fault. Dot size indicates the present relative population sizes of cities. Afterward, the county seat moved to Oakland. earthquake? Modified Mercalli Intensity maps for the Hayward earthquake plotted in ShakeMap format. 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]. Hayward Fault runs across photo near base of the escarpment below Hayward Hotel . 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). 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 population at risk from a Hayward Fault earthquake is now 100 times larger than in 1868. The section of the Hayward Fault that produced the 1868 Hayward earthquake is highlighted in yellow. The Hayward Fault: 140 Years after the 1868 Hayward Earthquake U.S. Geological Survey, California Geological Survey, Seismological Society of America . Courthouse, San Leandro. 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 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. The western side moved north and the eastern side moved south. Fremont Earthquake Exhibit. Location Taken: Hayward, CA, US. Services. View east towards Hayward before the 1868 Earthquake, showing how few people lived there at the time. Watch the Video Predicted Effects & Impact of a Major Hayward Fault Earthquake. . ] 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. 2008. The fault roughly follows the hills, but it does go through several cities. The Hayward Fault runs through the San Francisco suburb of Hayward, California. Hayward Fault and 1868 Earthquake Special Collection. On October 21, 1868, a magnitude 6.8 earthquake struck the San Francisco Bay area. On October 21, 1868, a magnitude 7.0 earthquake occurred on the Hayward Fault in the East Bay. In Fremont, the fault is marked by the ponds next to the BART station. 1868 Hayward Earthquake: 140-Year Retrospective: RMS Special Report; HSDL search results for: Hayward Fault Earthquake; Access. The fault slipped 3 to 6 feet along the fault. Hayward Fault and 1868 Earthquake Virtual Special Issue. . 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