They are calling it the "South Napa Quake:" According to the USGS, a magnitude 6.0 earthquake 3.7 NW of American Canyon struck at 3:20 this AM. There are reports of lots of building damage in downtown Napa and Vallejo and a dozen aftershocks.  I'm also hearing of a fire at a trailer park in north Napa that is being dealt with. Please note that everyone is being advised NOT to call 911 unless you have an actual emergency.  Lots of things knocked over and a lot of people waking up to their houses being trashed.  There are gas leaks, power outages and water main breaks but, thankfully, few reports of injuries at this time(mostly minor cuts). Get the latest from NBC Bay Area here and here are some of the photos showing up on social media: