A third earthquake struck California in less than six hours, this one rocking the city of Hayward near San Francisco and San ...

By contrast, an earthquake on the Puente Hills thrust fault system probably would max out at a magnitude 7.5 — still powerful, but less so than the southern San Andreas. The effects, however ...

MORGAN HILL, Calif. - A magnitude 3.4 earthquake struck east of Morgan Hill on Friday, the USGS reported. The earthquake was ...

That two inches -- the average distance the San Andreas fault moves each year -- has the ... argues that they should be treated as a single system with potential for earthquake ruptures generating ...