Small earthquake swarm rattles Northern California city. What's going on?

San Ramon has been hit by hundreds of tremors since mid-November.

USGS glitch triggers false earthquake alerts across Northern California

A U.S. Geological Survey system glitch triggered multiple false earthquake alerts across Northern California late Monday.
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Multiple Earthquakes Hit Northern California, Swarm Activity Detected Near Geysers

Earthquakes hit Aromas and The Geysers on Thursday, followed by swarm activity, highlighting ongoing seismic activity in the ...

Map: Small Earthquake Shakes Northern California

A minor earthquake with a preliminary magnitude of 3.4 struck Northern California on Tuesday, according to the United States Geological Survey. The temblor happened at 6:48 a.m. Pacific time about 5 ...