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Ventura Avenue Anticline
Structure and Seismic Hazard of the Ventura Avenue Anticline and Ventura Fault, California: Prospect for Large, Multisegment Ruptures in the Western Transverse Ranges
Quaternary rate of folding of the Ventura Avenue anticline, western Transverse Ranges, southern California
Abstract The Ventura basin in the Transverse Ranges of southernCalifornia (Fig. 1) contains evidence for major folding and faultingin Quaternary time, deformation that is still in progress. Muchof the evidence for age and deformation rates comes from theVentura Avenue anticline that began to form about 200 Ka. The locality exposes the axis of the western continuation of this anticlineand a folded reverse fault similar to larger ones known fromsubsurface information.
Abstract The Ventura basin in the Transverse Ranges of southernCalifornia (Fig. 1) contains evidence for major folding and faultingin Quaternary time, deformation that is still in progress. Muchof the evidence for age and deformation rates comes from theVentura Avenue anticline that began to form about 200 Ka. The locality exposes the axis of the western continuation of this anticlineand a folded reverse fault similar to larger ones known fromsubsurface information.
STRUCTURAL DEVELOPMENT OF THE VENTURA AVENUE ANTICLINAL TREND AT THE SAN MIGUELITO AND RINCON OIL FIELDS, VENTURA COUNTY, CALIFORNIA
ABSTRACT The San Miguelito and Rincon oil fields are located along the northern edge of the western Ventura basin. Both fields produce from the approximately 3350 m (11,000 ft) thick sequence of turbiditic Plio-Pleistocene strata contained in the Ventura Avenue anticlinal trend. The anticlinal trend formed against the basin-bounding north-dipping reverse faults of the Red Mountain fault system. Red Mountain faulting, which may have begun as early as late Miocene in the area of the ancient Red Mountain seaknoll, resulted in the formation of an unyielding barrier against which later basinal deformation to the south occurred. The formation of the anticlinal trend has been rapid and complex. The Ventura Avenue and Rincon anticlines are separated at the surface by the San Miguelito anticline. The San Miguelito anticline is a fault-propagation fold restricted to the hanging wall of the south-dipping Padre Juan reverse fault. The Ventura Avenue and Rincon anticlines, in contrast, are flexural-slip folds which are continuous beneath the Padre Juan fault. Geologic evidence from the Ventura area indicates that the anticlinal trend did not begin to form before 600,000 years ago, and possibly not before 200,000 years ago. For the Rincon anticline and San Miguelito anticline-Padre Juan fault pair alone, this results in shortening rates of 4.2 to 12.5 mm/yr (0.16 to 0.49 in/yr) or greater.
Cross section of the Ventura Avenue anticline and Ventura fault showing a s...
Stratigraphic map of the Pico Formation in the Ventura Avenue Anticline exp...
Kinematic model of the Ventura Avenue anticline, showing deformation over t...
Structural cross section through the Ventura Avenue anticline in the Ventur...
Large Transverse Range Earthquakes Cause Coastal Upheaval near Ventura, Southern California
Schematic north–south cross sections showing alternate models for the Ventu...
Three-dimensional (3-D) perspective view of the western Ventura Basin illus...
—Main slide areas in eastern part of Ventura Avenue oil field. Black dots i...
—Regional tectonic map modified from Yeats (1976) and Jennings (1977) . ...
Perspective view of the Ventura fault model from the east‐northeast, with d...
SANTA BARBARA AND VENTURA BASINS
The trip commences on Lavigia Hill where we gain an overview the physiography of the Transverse Ranges and to consider the framework and petroleum activity of the Santa Barbara Channel. The route proceeds westward from Santa Barbara to active tar seeps and exposures of fractured Monterey Formation at Carpinteria. Then we visit Conoco’s San Miguelito oil field to see the magnificent anticline in the core of the field and to examine turbidite sedimentation. We cross the axis of the fabled Ventura Avenue oil field, drive through Ventura, and turn northeast on to Hwy 126 and follow the Santa Clara River Valley up to Santa Paula. There we visit Texaco’s South Mountain oil field to observe depositional features of part of the Sespe Formation in the anticline. We continue to the Bardsdale oil field to consider the unique structure of the central Ventura basin and to reflect on the early history of its exploration and development. The trip concludes at the Torrey Canyon oilfield where the remarkable geologic structure of the Ventura basin is clearly displayed.