The tremor was felt in downtown Los Angeles and occurred in a mountain pass where two major faults come together.
A moderate earthquake has hit southern California – with a preliminary magnitude of 4.1.
The US Geological Survey says it struck at 10:55am local time on Friday about one mile northwest of Lytle Creek, in the mountains east of Los Angeles.
The quake was felt as a slight rocking in downtown Los Angeles, which is about 45 miles (72km) away from the epicentre.
