AMERICAN CANYON, Calif. --A magnitude 3.0 aftershock was felt near Napa this morning. The USGS says it struck at 3:56 a.m. about two and a half miles west-northwest of American Canyon.
There are no reports of damage or injuries. It's the second quake felt in the Bay Area in less than 9 hours. Last night a 2.9 earthquake hit near Palo Alto.