From Napa to Santa Cruz, many Bay Area residents say they felt the big jolt of a 3.9 earthquake on the Calaveras fault in the ...

Sponsored The quakes’ epicenters surrounded the Hayward fault, which spans from San Pablo Bay in the north to Fremont in the south. It runs under the cities of Berkeley, Oakland and Hayward before ...

Caption The Bay Area fault system and the spot (red star) where the Hayward Fault branches off from the Calaveras Fault. The white lines indicate faults recognized by the USGS. The red line is the ...