This photo from the USGS shows the epicenter of the M 3.8 earthquake that struck at 11:18 a.m. in Concord.
CONCORD, Calif. - A mangitude 3.8 earthquake struck at 11:18 a.m. Thursday just south of the Concord airport.
The earthquake happened at a depth of 4.16 miles.
KTVU received a few reports from viewers in the East Bay who felt a slight jolt.
There are no reports of damage.