San Francisco Bay Area rattled by cluster of earthquakes ongoing outside San Ramon

A cluster of earthquakes is rattling the San Francisco Bay Area centered within the city of San Ramon, including a magnitude 4.2 quake — the strongest thus far.

SAN RAMON, Calif. – A cluster of earthquakes is rattling the San Francisco Bay Area centered within the city of San Ramon, California, including a magnitude 4.2 quake — the strongest thus far.

The United States Geological Survey (USGS) has recorded at least eight earthquakes of at least magnitude 2.5 or greater since just before 6:30 a.m. local time. 

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Some of the earthquakes have been felt in San Francisco itself. 

There's no word on any damage.

Check back for updates on this developing story.