A magnitude-3.5 earthquake struck the Santa Monica Bay on Saturday morning, shaking the coastal cities of the South Bay.
According to data posted on the U.S. Geological Survey's website, the temblor occurred about 5 miles underground at 8:33 a.m.
The quake was in an area bisected by an offshore extension of the Palos Verdes Fault; however, a Caltech spokeswoman said it would take some study to see if the quake was on that fault.
USGS scientist Bob Dollar placed the exact epicenter 11 miles west-southwest of Hermosa Beach, and 11 miles west-northwest of Palos Verdes Estates. That location is 25 miles southwest of the Los Angeles Civic Center.
About 500 people in 81 ZIP codes reported whether they felt the earthquake on the USGS Community Internet Intensity Map. (Add your own response.) People as far north as Camarillo and Northridge and as far south as Irvine reported feeling "weak" shaking.
The most reports came from Manhattan Beach, El Segundo, Hermosa Beach, Redondo Beach and the Palos Verdes Peninsula.
—City News Service contributed to this report.