The quake’s epicenter was about 2 miles southwest of Chino Hills and about 5 miles southeast of Diamond Bar, the USGS said. Chino Hills is about 30 miles east of downtown Los Angeles.

The center was about 7.6 miles deep. In general, earthquakes centered closer to the Earth’s surface produce stronger shaking and can cause more damage than those further underground.

UPDATE:

USGS says it was a 5.4