This resource provides an abstract. New research suggests that authorities may need to reassess the threat posed by the Hayward fault, the fault responsible for San Francisco's highly destructive 1868 earthquake. The authors used a large shaking vehicle to send vibrations into the ground along a 1.6 kilometer portion of the Hayward fault and used the recorded vibrations reflected back from the fault to develop a profile of its shape and location. Findings are described.
