Calaveras Fault is a major branch of the San Andreas Fault System that is located in northern California in the San Francisco Bay Area . Activity on the different segments of the fault includes moderate and large earthquakes as well as aseismic creep . The last large event was the 1984 Morgan Hill event and the last moderate earthquake was the 2007 Alum Rock event . It is believed to link with the Hayward fault , as well as the West Napa Fault , north of the Carquinez Strait . It passes through or near the cities of Alamo , Danville , San Ramon , Dublin , Pleasanton , Sunol , Milpitas , San Jose , Gilroy , and Hollister
1984 Morgan Hill event
1984 Morgan Hill earthquake
Calaveras Fault