"According to the US Geological Survey, a 3.6M earthquake rumbled just south of Vallejo Thursday afternoon, and miled shaking was felt in San Francisco, the East Bay, and parts of the North Bay. The earthquake appears to have occurred along the Southampton Fault, which appears like a northern extension of the Calaveras Fault a fault running under the East Bay and down to Hollister, just east of the Hayward Fault."
"A swarm of small earthquakes along the Calaveras Fault occurred on Sunday morning, as the Chronicle reported, with the largest being 3.8M. The fault is thought to be capable of producing quakes as big as 6.7M, or thereabouts. A map below shows the major and minor faults under the Bay Area, with the Southampton Fault appearing in yellow, labeled with the number 11. It crosses paths with the Franklin Fault, which leads directly out of the Calaveras Fault and under the city of Vallejo."
A 3.6-magnitude earthquake struck two miles southeast of Vallejo at 12:41 pm Thursday, with light shaking reported in San Francisco, the East Bay, and parts of the North Bay. The event occurred along the Southampton Fault, described as a northern extension of the Calaveras Fault that runs under the East Bay and down to Hollister, east of the Hayward Fault. A swarm of small earthquakes along the Calaveras Fault occurred Sunday, the largest 3.8 magnitude. The Calaveras-related system is estimated capable of producing quakes near magnitude 6.7. Maps show the Southampton Fault crossing the Franklin Fault under Vallejo. Connected faults can rupture together and extend total rupture lengths, as seen in studies linking Rodgers Creek and Hayward faults over a 115-mile stretch.
Read at sfist.com
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