UPDATE 1-Magnitude 4.6 quake lightly rattles Los Angeles

(Updates with quake magnitude downgraded in paragraphs 1-3, extent of shaking felt in 4, background in 5)

Feb 9 (Reuters) - A magnitude 4.6 earthquake struck Southern California northwest of Los Angeles on Friday, rattling a wide area around the nation's second-most populous city, the U.S. Geological Survey (USGS) said. But there were no immediate reports of damage or injuries.

The quake was centered about 9 miles (14.5 km) west of Thousand Oaks, a community in the coastal foothills about 40 miles northwest of downtown L.A., according to the USGS.

The tremor was initially recorded at a magnitude of 5.1, but was downgraded later by the USGS to 4.6.

A crowd-sourced "Did You Feel It?" map posted online by the USGS showed that weak-to-light shaking was detected by residents all around Los Angeles, with scattered reports of faint ground movement as far north as Bakersfield and as far south as San Diego.

Earthquakes of that size are commonplace in seismically active California and generally cause little or no property damage. (Reporting by Steve Gorman in Los Angeles; Additional reporting by Surbhi Misra in Bengaluru; Editing by Chris Reese and Sandra Maler)