The quake, whose epicenter was located about 2 miles east of Northridge, struck at 10:38 a.m. and was measured at a depth of nearly 7 miles., the USGS said.
"Felt it in Van Nuys," ABC7 viewer Lynne Voloshen wrote on Facebook. "No big deal." Lisa Tollison described feeling a "quick jolt" in Sherman Oaks.
Twitter user @ _andias said her "windows were rattling in San Fernando."
There were no reports of injuries or damage.