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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]
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 .
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 ...
Nearly 75% of the country is at risk for a potentially damaging earthquake in the next 100 years, according to a recently updated map from the U.S. Geological Survey.
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.
A fault off the Pacific coast could devastate Washington, Oregon and Northern California with a major earthquake and tsunami. Researchers mapped it comprehensively for the first time.
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 January 2025).
Geologic maps of the Maacama Fault The Maacama Fault is a right lateral-moving (dextral) geologic fault located in the Coast Ranges of northwestern California . It is considered to be the northernmost segment of the Hayward Fault subsystem of the San Andreas Fault zone.