Structural Evolution of the Western Transverse Ranges PDF Download
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Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 168
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Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 168
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Book Description
Author: Patrick A. Jackson
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 214
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Book Description
The Pleistocene Carpinteria basin is an east-trending northward-verging, faulted syncline containing up to 1220m of partially intertonguing Santa Barbara and Casitas Formations deposited on previously folded pre- Pleistocene strata with up to 80° discordance. Structures subcropping against the unconformity indicate most of the deformation in the Santa Ynez Range prior to deposition of the Santa Barbara Formation approximately one Ma ago was by folding. During that time, the Carpinteria area was the northern margin of the offshore Ventura basin; subsequent uplift north of the Red Mountain fault (RMF) isolated the Carpinteria basin during middle to late Pleistocene time. Quaternary faults in the area are either south-dipping reverse faults related to bedding-slip in pre- Pleistocene strata or north-dipping reverse faults that truncate bedding and are seismically active. The Rincon Creek fault (RCF) dips 35°-60° south steepening to near-vertical at depth, where it apparently passes into bedding within the upper Sespe Formation. It offsets late Pleistocene marine terraces and is itself deformed by the RMF. The RMF dips 55°-63° north at the surface and steepens to 75° north with depth; and also steepens westward south of the Summerland Offshore oil field to 85° north. Vertical separation decreases westward from 4500m north of the Rincon field to 350m at Rincon Point. The main branch of the RMF offsets a 45,000yr marine terrace, but not a 4,500yr terrace. The Summerland Offshore oil field occurs within a disharmonically folded anticline in which incompetent, severely deformed Miocene mudstone overlies competent, broadly folded Oligocene sandstone. Because the anticline formed after deposition of the Santa Barbara Formation, the age of oil migration into the field was post-Santa Barbara during middle to late Pleistocene time.
Author: Yuval Levy
Publisher:
ISBN:
Category :
Languages : en
Pages : 133
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Book Description
The Transverse Ranges of California is an active fold-and-thrust belt and has produced some of the most destructive earthquakes in Southern California. Understanding the subsurface structure has both scientific and societal importance, in particular for earthquake hazard assessments. The diverse set of conflicting structural models, specifically in the Western Transverse Ranges, highlights the lack in understanding of the fault architecture in the subsurface. This Thesis presents a new structural model for the Western Transverse Ranges, a test of the model predictions against GPS measurements, and an advancement of the understating of the subsurface structure, evolution and slip rates in the Central Transverse Ranges. After the full range of available observations was compiled we applied structural forward modeling using Trishear to match the observed structure and the interpreted evolution. The first chapter describes modeling of the Western Transverse Ranges since the Pliocene as a southward propagating imbricate thrust system. The second chapter presents a refinement of the model in chapter one, which was accomplished by comparing of a series of kinematic model predictions against GPS measurements in order to narrow the estimated range of dips for the deep part of the fault system. This is also the first time a structural model for the entire Western Transverse Ranges incorporates the full range of geological and geophysical data and observations. The third chapter presents the structural evolution of the Sylmar basin in the highly populated area of San Fernando Valley, northern Los Angeles county. The chapter presents an argument for lowering the estimated slip rate of the Santa Susana fault and distributing it to the faults that are located farther south. The structural understanding as developed by this thesis can help to improve the earthquake risk assessments in the Transverse Ranges.
Author: Catherine A. Rigsby
Publisher:
ISBN:
Category : Electronic journals
Languages : en
Pages : 64
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Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 72
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Book Description
Author: Richard L. Sedlock
Publisher: Geological Society of America
ISBN: 0813722780
Category : Science
Languages : en
Pages : 161
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Book Description
Author: Kathi K. Beratan
Publisher: Geological Society of America
ISBN: 0813723035
Category : Science
Languages : en
Pages : 53
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Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 44
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Book Description
Author: Clarence A. Hall, Jr.
Publisher: Geological Society of America
ISBN: 0813722667
Category : Science
Languages : en
Pages : 50
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Book Description
Author: Allen F. Glazner
Publisher: Geological Society of America
ISBN: 9780813711959
Category : Science
Languages : en
Pages : 380
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Book Description
CD-ROM contains: Electronic version of text -- Maps.
