A 3.6-magnitude earthquake has rattled the Simi Valley area this morning.
The U.S. Geological Survey says the quake occurred at 12:36 a.m., about four miles west of the Castaic Lake Dam, in an area about 45 miles northwest of Los Angeles.
Geophysicist Jessica Sigala says it was felt in Newbury Park, Moorpark and Santa Clarita. She says it hasn't caused any damage.
Copyright 2010 The Associated Press.