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High Geologic Slip Rates since Early Pleistocene Initiation of the San Jacinto and San Felipe Fault Zones in the San Andreas Fault System, Southern California, USA

Product Code: USPE475
Series: GSA Special Papers
Author/Editor: By Susanne U. Janecke, Rebecca J. Dorsey, David Forand, Alexander N. Steely, Stefan M. Kirby, Andrew T. Lutz, Bernard A. Housen, Benjamin Belgarde, Victoria E. Langenheim, and Tammy M. Rittenour
Publication Date: 24 January 2011
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Description

Special offer price £10.00 (usual price £29 / GSA&GSL £20) 

GSA Special Paper 475

The San Jacinto right-lateral strike-slip fault zone is crucial for understanding plate-boundary dynamics, regional slip partitioning, and seismic hazards within the San Andreas fault system of southern California, yet its age of initiation and long-term average slip rate are controversial. This synthesis of prior and new detailed studies in the western Salton Trough documents initiation of structural segments of the San Jacinto fault zone at or slightly before the 1.07 Ma base of the Jaramillo subchron. In Special Paper 475, five new estimates of displacement are developed using offset successions of crystalline rocks; distinctive marker beds in the late Cenozoic basin fill; analysis of strike-slip–related fault-bend folds; quantification of strain in folds at the tips of dextral faults; and gravity, magnetic, and geomorphic data sets.

Type: Book
Ten Digit ISBN:
Thirteen Digit ISBN: 9780813724751
Publisher: GSA
Binding: Paperback
Pages: 48
Weight: 0.35 kg

Contents

Abstract
Introduction


Structural Geology of Dextral Fault Zones in the Western Salton Trough

San Jacinto Fault Zone
Clark Fault Zone
Right Slip across the Clark Fault Zone in Crystalline Rocks
Right Slip across the Clark Fault Zone in Sedimentary Rocks
Coyote Creek Fault Zone
Displacement near Coyote Mountain
Displacement near Borrego Mountain
San Felipe Fault Zone
Structural Geometry
Displacement
Folds within the Dextral Fault Zones
How Robust Are the New Slip Estimates?

Basin Analysis and Fault Activity

Structural Setting of the Study Sites 27
Stratigraphy of Pleistocene and Holocene Deposits
Dating Initiation of the San Jacinto and San Felipe Fault Zones in the Western Salton Trough

Changes after Initiation of the San Jacinto and San Felipe Fault Zones

Early San Jacinto Fault Zone
Formation of the San Felipe Anticline within the Early San Jacinto Fault Zone
Clark Fault
Santa Rosa Segment of the Clark Fault
Initial Blind Slip on the Tarantula Wash Segment of the Clark Fault
Coyote Creek Fault
Coyote Ridge Segment of the Coyote Creek Fault
Borrego Badlands and Borrego Mountains Segments and Their Possible Precursors
San Felipe Fault Zone
Insights into Structural Reorganizations from Lithology, Provenance, Paleocurrents, and Depositional Environment of Basinal Deposits
Younger Deformation

Discussion

Summary of Results from the Western Salton Trough
Total Slip and Age of the San Jacinto Fault Zone
Comparison to the Northwestern San Jacinto Fault Zone
Lifetime and Interval Fault Slip Rates
Clark Fault
Lifetime Slip Rate
Interval Slip Rate
Coyote Creek Fault
Lifetime Slip Rate
Interval Slip Rates
San Felipe Fault Zone
Total Lifetime Slip Rate across the San Jacinto Fault Zone
Comparison of Slip Rates
Variation of Slip Rates in Time and Space?
Implications for the Southern San Andreas Fault System

Conclusions
Acknowledgments
References Cited


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