The first happened near Suisun City around 2 p.m. The USGS says it was a preliminary 3.3 magnitude quake.
People reported feeling it as far away as Santa Rosa, Sacramento and as far south as Hayward.
There was also a second 2.7 magnitude quake just before 5 p.m..
There is no word of any injuries or damage.
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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