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Net Dextral Slip, Leogen San Gregorio--Hosgri Fault Zone, Coastal California: Geologic Evidence & Tectonic Implications

Product Code: USPE391
Series: GSA Special Papers
Author/Editor: W.R. Dickinson, Mihai Ducea, L.I. Rosenberg, H.G. Greene, S.A. Graham, J.C. Clark, G.E. Weber, Steven Kidder, W. Gary Ernst, and Earl E. Brabb
Publication Date: 01 September 2005
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Special offer price £9 (usual price £25 / GSA&GSL £17.50)

GSA Special Paper 391.

The San Gregorio-Hosgri fault is the major subsidiary strand of the San Andreas fault system in coastal California, where its course is partly onshore and partly offshore. Understanding the path and amount of San Gregorio-Hosgri fault displacements is important for understanding the geologic history of California and seismic hazard along the California coast. This Special Paper summarizes evidence for 156 km of net San Gregorio-Hosgri fault slip based on an analysis of onshore and offshore geologic mapping supplemented by reappraisal of key geologic features offset by San Gregorio-Hosgri fault movements.

GSA stock clearance.

Type: Book
Ten Digit ISBN: 0-8137-2391-4
Thirteen Digit ISBN: 978-0-8137-2391-4
Publisher: GSA
Binding: Paperback
Pages: 43
Weight: 0.31 kg


Abstract 1 Introduction 2 Tectonic Setting 3 Slip Rate over Time 5 Course of Fault 5 San Gregorio Segment 5 Monterey Bay Segment 5 Big Sur Segment 9 San Simeon Segment 11 Hosgri Segment 13 Offset Nacimiento Fault 13 Cross-Fault Contrasts 13 Nature of Faulting 14 Regional Relations 14 Nacimiento Piercing Points 16 Big Creek Enclave 16 Shell Well Core 17 Alternate Piercing Points 19 Pigeon Point?Atascadero Correlation 20 Supportive Tertiary Exposures 20 Tectonic Reconstructions 21 Northern Salinian Block 21 Point Sur Franciscan Block 23 San Simeon and Point Sal 25 Regional Problems 25 Gualala Block Problem 25 Gualala Block Position 27 Gualala Stratal Relations 27 Gualala Fault Sliver 28 Alternate Gualala Restoration 28 Pilarcitos Fault Relations 30 Gualala Block Slip 30 Proto?San Andreas Question 31 Intra-Salinian Deformation 33 Tularcitos Saddle 33 Santa Lucia Transpression 36 Distributive Strike Slip 36 General Conclusions 36 Acknowledgments 37 References Cited 


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