![]() ![]() Some geologists have suggested that the Southern Calaveras should be renamed as the Southern Hayward. In 2007, the Hayward Fault was discovered to have merged with the Calaveras Fault east of San Jose at a depth of 6.4 kilometers (4.0 mi), with the potential of creating earthquakes much larger than previously anticipated. To the east of the Hayward Fault lies the Calaveras Fault. The Hayward Fault is parallel to the San Andreas Fault, which lies offshore and through the San Francisco Peninsula. It runs through densely populated areas, including Richmond, El Cerrito, Berkeley, Oakland, San Leandro, Castro Valley, Hayward, Union City, Fremont, and San Jose. This fault is about 119 km (74 mi) long, situated mainly along the western base of the hills on the east side of San Francisco Bay. 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. The Hayward Fault Zone is a right-lateral strike-slip geologic fault zone capable of generating destructive earthquakes. USGS map showing faults that span the Pacific–North America plate boundary.
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