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Resources

Magnitude 3.1 Quake Rattles San Ramon, Extends East Bay Swarm

USGS characterizes the activity as a recurring Calaveras Fault swarm that has not caused reported damage.

Series of Small Quakes Rattles Bay Area and Central Coast, Latest a M3.4 Near San Juan Bautista

Calaveras Fault Swarm Rattles East Bay as Dozens of Small Quakes Follow M3.8 Near San Ramon