The epicenter of the quake was located 2 miles north-northeast of the town of Canyondam, the USGS said. An initial report said the quake was magnitude 5.9. A 5.7 magnitude quake is considered moderate, but has the potential to cause considerable damage. There were no immediate reports of damage or injuries.
http://www.reuters.com/article/2013/05/24/us-usa-quake-idUSBRE94N05720130524