Maps: USGS Petaluma River and Novato, Mt. Burdell Open Space Preserve map Burdell Mountain rises 1,558 feet from the Novato Valley floor on the northeast corner of Marin County.

The quake struck at 12:49 a.m. and was located 2 kilometers northwest of the unincorporated community of Diablo, near Danville. It had a depth of 7.3 kilometers, according to USGS officials.