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Convergence, block rotation, and structural interference across the Peninsular-Transverse Ranges boundary, eastern Santa Monica Mountains, California

Meigs, Andrew J. and Oskin, Michael E. (2002) Convergence, block rotation, and structural interference across the Peninsular-Transverse Ranges boundary, eastern Santa Monica Mountains, California. In: Contributions to Crustal Evolution of the Southwestern United States. Special papers (Geological Society of America). No.365. Geological Society of America , Boulder, CO, pp. 279-293. ISBN 9780813723655.

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Active deformation in southern California occurs in two discrete structural provinces. To the south of ~ 34°N latitude, the Peninsular Ranges structural province is characterized by northwest-trending strike-slip faulting, northwest motion of crustal blocks relative to stable North America, and negligible vertical-axis block rotation. In contrast, the Transverse Ranges province to the north of ~ 34°N latitude is characterized by west-trending oblique-slip faulting and a significant component of north-south crustal shortening contemporaneous with northwestward motion and vertical-axis block rotation relative to stable North America. A structurally complex transition zone between N33°45' and N34°15' latitude defines the boundary separating these two provinces. Bedrock and geomorphic relationships in the eastern Santa Monica Mountains document the sequential development of part of this boundary region. At the longitude of downtown Los Angeles, the Malibu Coast- Santa Monica-Hollywood fault system and the Elysian Park fault systems have accommodated the bulk of the differential motion in the boundary zone between the two provinces over the last 2.5-5 m.y. Structural evolution of the boundary zone was dictated by the progressive increase in displacement and lateral propagation of each fault system, differential vertical-axis rotation of the Transverse Ranges block relative to the Peninsular Ranges block, and a decrease in the obliquity of convergence with time. This interaction transferred a portion of the Elysian Park anticline, an anticline developed in association with the Elysian Park fault system, to the hanging wall of the Hollywood fault. Net slip across the boundary zone north of downtown Los Angeles is limited to 1.7-2.5 km of dip-slip, to 1.5 km of strike-slip, and 2.3-2.9 km of oblique-slip during the past 2.5-5 m.y. These low values imply that the southern boundary of the Transverse Ranges has remained largely coupled to the adjacent Peninsular Ranges structural province during compression. Using a 5 Ma age for initiation of growth of the Santa Monica Mountains and Elysian Park anticlines enables minimum rates of 0.3-0.5 mm/yr, 0.3 mm/yr, and 0.5-0.6 mm/yr for the dip-slip, strike-slip, and oblique-slip components of motion, respectively. A 2.5 Ma age of initiation of the Elysian Park anticline would double these rates. A new tectonic model for the structural evolution of the boundary zone based on the sequence of structural overprinting reconciles apparently discrepant geologic, paleoseismic, and geodetic data, data suggesting that the boundary zone is dominated by long-term strike-slip, intermediate-term oblique-slip, and short-term dip-slip displacement.

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Oskin, Michael E.0000-0002-6631-5326
Additional Information:© 2002 Geological Society of America. Manuscript accepted by the Society February 8, 2002. Ramon Arrowsmith, Ray Ingersoll, Karl Mueller, Bob Yeats, and Doug Yule provided helpful, detailed reviews of this manuscript that helped to clarify and strengthen our arguments. Kerry Sieh, Jim Dolan, and Chris Sorlien are thanked for discussions. A.J.M. was supported by a Division of Geological and Planetary Sciences, California Institute of Technology Postdoctoral Fellowship, a Southern California Earthquake Center Postdoctoral Fellowship. This research was supported by the Southern California Earthquake Center and grants from the NASA Topography and Surface Change program to D. Burbank (NASA (NAG-5-2191), NASA (NAG-5-7646)). Stereonet program provided by Rick Allmendinger. SCEC is funded by NSF Cooperative Agreement EAR-8920 136 and USGS Cooperative Agreements 14-08-0001-A0899 and 1434-HQ-97AGO1718. This is Southern California Earthquake Center paper 410.
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Caltech Division of Geological and Planetary SciencesUNSPECIFIED
Southern California Earthquake Center (SCEC)UNSPECIFIED
Series Name:Special papers (Geological Society of America)
Issue or Number:365
Record Number:CaltechAUTHORS:20150209-151911529
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Official Citation:Andrew J. Meigs and Michael E. Oskin Convergence, block rotation, and structural interference across the Peninsular-Transverse Ranges boundary, eastern Santa Monica Mountains, California Geological Society of America Special Papers, 2002, 365, p. 279-293, doi:10.1130/0-8137-2365-5.279
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54581
Deposited By: Tony Diaz
Deposited On:10 Feb 2015 05:09
Last Modified:10 Nov 2021 20:35

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