The first was a preliminary 2.5 earthquake and happened at 12:48 p.m., the USGS said.
The second quake, a preliminary 3.1, struck around 1:20 p.m. It was later downgraded to 2.8.
The third earthquake, a 2.7, occurred at 1:59 p.m., according to the USGS.
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This comes after another earthquake, a magnitude 3.8, struck near Antioch this past Wednesday.
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So far, there have been no reports of any major damage or injuries.
Click here for the latest stories and videos about earthquakes here in the Bay Area and around the world, and click here for more information on disaster preparedness.
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