10 Facts About Hayward Fault

Hayward Fault Zone is a right-lateral strike-slip geologic fault zone capable of generating destructive earthquakes.

Hayward Fault is parallel to the San Andreas Fault, which lies offshore and through the San Francisco Peninsula.

Transform boundary defined by the San Andreas Hayward Fault is not perfectly straight, and the stresses between the Pacific and North American Plates are diffused over a wide region of the West, extending as far as the eastern side of the Sierra Nevada Mountains.

The Hayward Fault is one of the secondary faults in this diffuse zone, along with the Calaveras Fault to the east and the San Gregorio Fault, west of the San Andreas.

Connection between the Rodgers Creek Fault Zone and the Hayward Fault Zone was unclear until 2015 when a survey of the floor of San Pablo Bay found that the ends of the two faults were smoothly linked between Point Pinole and Lower Tubbs Island.

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Calaveras Hayward Fault is continuous from the Sunol area south to Hollister.

Largest quake on the Hayward Fault in recorded history occurred in 1868, with an estimated magnitude of 7.

Many seismologists believe that the 1906 San Francisco earthquake, which occurred on the San Andreas fault, reduced the stress on many faults in the Bay Area including the Hayward fault, creating an "earthquake shadow": a quiescent period following a major earthquake.

In June 2006 Bay Area Rapid Transit management announced that they have elected not to modify the Berkeley Hills Tunnel, which actually penetrates the Hayward Fault, arguing that it would be cheaper to rebore a misaligned portion after the fact than to protect riders against the small likelihood that a train would crash into or be cut in two by a major slippage of the fault.

Hayward Fault continues north under the eastern margin of Lake Temescal and its dam, which is unlikely to fail since it has been completely reinforced by the extensive earth fill supporting the subsequently improved Highway 24.