SAN FRANCISCO (AP) -- Some people in the San Francisco Bay area were awakened by an earthquake, though there have been no damage reports.
A U.S. Geological Survey computer-generated report says the magnitude-4.0 quake struck at 5:33 a.m. Monday and was centered eight miles north of San Francisco in the El Cerrito area.
Bay Area Rapid Transit trains are delayed about 10 minutes because tracks had to be inspected.
San Francisco police Officer Aldie Esparza says the Office of Emergency Management hasn't received any damage reports.
Esparza says police communications center employees described it as a light swaying motion, noting the building is on rollers.
Esparza was asleep at home and describes it as a sharp jolt that woke him up.
A California Highway Patrol dispatcher says the quake was felt throughout San Francisco.