San Francisco Bay area earthquake swarm migrates toward the major Calaveras Fault

75 quakes have rattled the beautiful town of Danville – you remember ‘Mrs. Doubtfire’ – last week? The shallow quakes hit at a depth of 5-7 km (3-4 mi) on a unmapped fault or set of faults. Although most of the quakes in this week’s swarm are 3-5 km (2-3 mi) from the Calaveras Fault, the swarm is clearly migrating toward the major Calaveras Fault.

San Francisco Bay area earthquake swarm migrates toward the major Calaveras Fault

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