I think I may have just experienced my first LA earthquake, but I'm not sure. It felt like a giant just leaned against the outside of my apartment and shook it the same way I'd shake a vending machine if my bag of chips failed to drop down into the receiving bay.
UPDATE: Not the most intuitive map, but I see a big red square on this earthquake map indicating seismic activity in the last hour. Judging by eye it looks like around a 4.0 magnitude earthquake. Ah, wait...here it is: a 4.5 earthquake at 12:58AM.