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The 1868 Hayward earthquake occurred in the San Francisco Bay Area, California, United States on October 21. With an estimated moment magnitude of 6.3–6.7 and a maximum Mercalli intensity of IX ( Violent ), it was the most recent large earthquake to occur on the Hayward Fault Zone .
USGS map showing faults that span the Pacific–North America plate boundary. The Hayward Fault Zone is a right-lateral strike-slip geologic fault zone capable of generating destructive earthquakes. The fault was first named in the Lawson Report of the 1906 San Francisco Earthquake in recognition of its involvement in the earthquake of 1868. [1]
There is a 70% probability that one of these faults will generate a 6.7 M w or greater earthquake before 2030, including the Hayward Fault Zone, which has gone beyond its average return period of 130 years (156 years ago as of February 2025).
A map of the faults that run through Stanislaus County. ... Calaveras and Hayward faults, according to the county. ... There is an 80.62% chance of a major earthquake within 31 miles of Stanislaus ...
A landmark report by the U.S. Geological Survey in 2018 estimates that at least 800 people could be killed and 18,000 more injured in a magnitude 7 earthquake on the Hayward fault centered below ...
The Berkeley Hills are bounded by the major Hayward Fault along their western base, and the minor Wildcat fault on their eastern side. The highest peaks are Grizzly Peak with an elevation of 1,754 feet (535 m) and Round Top, an extinct volcano with an elevation of 1,761 feet (537 m) and William Rust Summit at an elevation of 1,004 feet (306 m).
The tunnel crosses the Hayward Fault at a nearly perpendicular angle 850 feet (260 m) from its western portal, and creep along the fault resulted in an offset of 13 inches (330 mm) by 2008. [6] The maximum credible earthquake (magnitude 7.0) predicted in studies would cause an offset of 7.5 feet (2.3 m).
The probability of a serious earthquake on various faults has been estimated in the 2008 Uniform California Earthquake Rupture Forecast. According to the United States Geological Survey, Southern California experiences nearly 10,000 earthquakes every year. [3] Details on specific faults can be found in the USGS Quaternary Fault and Fold Database.