Where is rodgers creek fault

Science Explorer. Multimedia Gallery. Park Passes. Technical Announcements. Employees in the News. Emergency Management. The pattern of surface faulting and earthquake activity may be an expression of deformation resulting from intensified frictional resistance where the fault abuts the dense, magnetic body of rock at depth. A large earthquake on the Rodgers Creek Fault that ruptures through the proposed asperity has the potential to intensely shake the sedimentary basin beneath Santa Rosa.

This basin is already known, from an earlier study of the damaging Santa Rosa and San Francisco earthquakes, to amplify shaking at the ground surface.

The Rodgers Creek Fault is thought to be among the most likely faults to produce the next large earthquake in the Bay Area. Skip to main content. Search Search. Release Date: April 4, Shaded relief image of the Santa Rosa area showing active faults black lines and the detailed rupture pattern of the Rodgers Creek Fault where it crosses central Santa Rosa in red.

The fault also shows a sharp discontinuity right at the surface, which is very surprising in recently deposited Bay mud. It suggests that either the fault is creeping there, or there has been recent seismic slip.

This means that it will be extremely difficult to prove whether such a combined rupture has happened in the past. So, the Watt et al. The faults as they now appear in Temblor. The combined Rodgers Creek-Hayward Fault extends from Santa Rosa to San Jose both outside the frame , two cities that were also badly damaged in the earthquake.

Whenever ruptures speed up or slow down, they shed seismic energy—which we feel as strong shaking. A combined rupture could double that duration to up to seconds. The longer the shaking continues, the more buildings, bridges, pipelines, and dams would fatigue. Think of a thin stainless steel strap: Bend it back and forth a few times and it weakens; do this repeatedly and it snaps.

A long shaking duration may also increase the liquefaction hazard. Instead, repeated fault slip through the curved section has caused the area to subside, creating the trough in the landscape that captures the drainage from the Great Valley that we know as the Delta.