UPDATE, 9:25 a.m. EDT: NBC News reported more than 50,000 people are now without power following the earthquake.
At this time there's no exact determination of the causative fault, though the Browns Valley section of the West Napa fault is suspected.
— USGS (@USGS) August 24, 2014
There are only a few I reinforced masonry buildings left in Napa and they took a lot of damage. pic.twitter.com/tbCfO4o4rs
— City of Napa (@CityofNapa) August 24, 2014
A magnitude-6.0 earthquake hit Northern California early Sunday, according to the U.S. Geological Survey. The USGS said the quake struck at 3:20 a.m. PDT (6:20 a.m. EDT) four miles northwest of American Canyon and 51 miles west-southwest of Sacramento.
There were no immediate reports of injuries. However, the Pacific Gas and Electric Co. unit of the PG&E Corp. (NYSE:PCG) indicated as many as 15,000 of its customers in the region are without power as a result of the quake:
— Breaking News (@BreakingNews) August 24, 2014
— Todd Benson (@TBensonBrazil) August 24, 2014