The Hayward Fault Zone is a right-lateral strike-slip geologic fault zone capable of generating destructive earthquakes. The fault was first named in the Lawson Report of the 1906 San Francisco Earthq
Preferential groundwater flow along the fault emerges as a spring supporting the riparian vegetation in the center of this photo of Taylor Mountain Regional Park. The spring is the source of Cooper Creek which flows northward through a deeply incised canyon along the fault on the southern edge of Santa Rosa, California, to a confluence with Matanzas Creek at Doyle Community Park.