The USGS reports that the earthquake moments ago was a 4.1 on the Richter scale. Looks like the epicenter is about where the 4.7-magnitude quake was on Sunday night.
No reports yet of damage.
UPDATE #1: "Some people felt it, some people didn't," says Lt. Kent Wegener of the Lennox Sheriff's Station. "It wasn't as strong as the one the other day."
No damage either in Torrance, Hawthorne, Hermosa, Manhattan, El Segundo.
Google Maps indicates the epicenter is about five blocks south and three blocks east of the epicenter of Sunday's quake.
UPDATE #2: Janice Hahn Twittered it:
Wow. Just felt that earthquake! Was that an aftershock of Sundays?
UPDATE #3: No problems at LAX.

Felt it; could tell it did not have quite as much force as the one on Sunday night.
i thought it was a large truck driving by! haha
Our building is so old I thought the tiles would come tumbling on my head, but the earthquake only lasted as long as the thought ; )
We're in San Pedro and felt one quick jolt. Scary!
Felt it over here in Cerritos!
Aftershock or precursor?
Large jolt here in Hawthorne. Not as strong as Sunday's quake, but definitely was strong.
a picture fell on my head and we swayed on the 2nd floor a bit.
One big shake; I'm assuming an aftershock. I thought it might be a truck, too. I even had to go look out the window.