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The Oak Ridge fault is the longest south-dipping Quaternary reverse fault in the western Transverse Ranges, extending from the Santa Susana Mountains westward along the south side of the Santa Clara Valley into the Santa Barbara Channel. It also has the largest late Cenozoic displacement of any southdipping fault in this region. The fault b«g«\ as a normal Fault annular to Miocene volcanoes in the western Santa Monica Mountains. Pliocene and early Pleistocene displacement is documented by a thickness of strata in the footwall block in the Santa Clara Valley greater than that in the hanging-wall block on the south side of Oak Ridge. Displacement rates increased from west to east and from older to younger, with highest rates in the middle Pleistocene. In the last 0.4-0.2 Ma, uplift of Oak Ridge has accompanied reverse slip on the Oak Ridge fault at rates of 5.9 to 12.5 mm/yr except near the coast and offshore, where uplift has been zero. The fault is divided into five segments. (1) a west-trending coastal and offshore segment where both sides are today at maximum burial, (2) a northeast-trending, steeply-dipping, oblique-slip segment that marks the west end of uplift of Oak Ridge, (3) an east-trending dip-slip segment marked by tectonic topography east of Santa Paula, (4) a dip-slip, lobate segment from Balcom Canyon to Wiley Canyon, and (5) an eastern segment where the fault divides into several splays and dies out. Both the Santa Clara syncline and Oak Ridge anticline are en echelon, left-stepping along the west half of the fault. The Montalvo mounds, pressure ridges within the coastal segment, contain tilted and faulted sediments probably younger than 30,000 years. An alluvial fan near Bardsdale with sediments 2,000 years old at its surface is deformed by a scarp reflecting normal faulting of 1.7 to 2.1 m and broad warping with vertical separation of 5 m, possibly reflecting a buried reverse fault related to folding of the Oak Ridge anticline. The lack of evidence for fault creep and the apparent entrainment of sediments along fault planes in the Montalvo mounds and at Bardsdale suggest that fault displacement accompanies earthquakes. OAK RIDGE FAULT, VENTURA BASIN. CALIFORNIA

Oak Ridge fault, Ventura basin, California: Slip rates and late Quaternary history