That's a sizable shaker depending on where one is located and how deep the temblor was. USGS reports the epicenter to be 1.7 miles NNE of Hawthorne, CA (approximate 10 miles SW of downtown Los Angeles).
We're all fine here, no damage, but we'll update this item, as merited, if we learn about more extensive trouble elsewhere.
UPDATE 9:02pm PT: KCAL 9 TV News reports the shaker was 8.4 miles deep. Folks near the epicenter are reporting glasses having fallen off shelves, sounds of ambulances, but so far no report of major damage or injury. They also report a 3.1M aftershock at 8:45pm PT, though we didn't notice here, pretty much in the heart of Hollywood, a mile or three NW of downtown Los Angeles.
UPDATE 9:13pm PT: By way of comparison, the 1994 Northridge Earthquake, which killed 72 people and injured more than 9,000 was a 6.7 magnitude shaker, with a depth of 10.6 miles.
UPDATE: 9:26pm PT: LA Times coverage here, includes a bunch of comments from locals who felt the quake across a wide area of L.A.