Three-Dimensional Geologic Map of the Hayward Fault Zone, San . - USGS
The Hayward Fault (fig. 1) is one of three major faults of the San Andreas Fault System that has produced large (M>6) historic earthquakes in the San Francisco Bay area; the other major faults are the San Andreas and Calaveras Faults. The Hayward Fault roughly bisects the San Francisco Bay