A magnitude 4.0 earthquake shook the San Francisco Bay area on Monday, the U.S. Geological Survey reported.
The quake, which was initially reported at a 4.3 magnitude, was centred about 15 miles (24 km) northeast of San Francisco, and was at a depth of 5.5 miles (8.8 km), the USGS said.
There were no immediate reports of damage or injuries.
It woke me up. I heard a woman in my building scream. It lasted several seconds, said a resident in nearby Oakland, located across San Francisco Bay. The resident said it was still dark when the quake hit.
(Reporting by Noel Randewich; Editing by Paul Simao)