An M6 strike-slip earthquake occurred in the northern San Francisco Bay area last night. It is reported as 6 km NW of American Canyon and between Napa and Vallejo. This is the biggest event in the Bay Area since the 1989 M6.9 Loma Prieta earthquake. The Did You Feel It mapping shows that shaking was very strong in the north Bay area and it was felt widely across the region.
Here are a few links:Main USGS page on the event
