Tectonic contact: indicated by offset | San Andreas Fault The San Andreas Fault has had three notable earthquakes in historic times: 1989 - 25 miles (40 kilometers) ruptured near Santa Cruz, California, causing 63 deaths and heavy but localized damage to the portions of the San Francisco Bay Area. Magnitude = 7.1. See: Loma Prieta earthquake. On September 28, 2004 at 10:15 am, a magnitude 6.0 earthquake struck at Parkfield, California on the San Andreas Fault. This earthquake was originally expected to occur in 1993 based on the latest earthquake prediction theories known at the time. Eleven more years elapsed before this prediction was finally fulfilled. Despite the extra time between events (38 years compared to an average recurrence interval of 22 years), the magnitude of the earthquake was no larger than originally expected.