An anonymous reader writes "A 5.1 earthquake hit Southern California at 9:09PM local time on Friday. It was preceded by a 3.6 earthquake, then followed by 3.4 and 3.6 quakes, as well as 100+ smaller aftershocks. The United States Geological Survey has a map showing the epicenter. There have been no reported deaths, though roughly 50 people have been displaced from their homes. 'The shake caused a rock slide in Carbon Canyon, causing a car to overturn, according to the Brea Police Department. Fullerton police received reports of water main breaks and windows shattering, but primarily had residents calling about burglar alarms being set off by the quake.'"