Initiation of the San Jacinto Fault and its Interaction with the San Andreas Fault: Insights from Geodynamic Modeling |
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Authors: | Qingsong Li Mian Liu |
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Institution: | (1) Department of Geological Sciences, University of Missouri, Columbia, MO, 65211, U.S.A;(2) Lunar and Planetary Institute, Houston, TX, 77058, U.S.A |
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Abstract: | The San Andreas Fault (SAF) is the Pacific-North American plate boundary, yet in southern California a significant portion
of the relative plate motion is accommodated by the San Jacinto Fault (SJF). Here we investigate the initiation of the SJF
and its interaction with the SAF in a three-dimensional visco-elasto-plastic finite-element model. The model results show
that the restraining bend of the southern SAF causes strain localization along the SJF, thus may have contributed to its initiation.
Slip on the SJF tends to reduce slip rate on the SAF and enhance deformation in the Eastern California Shear Zone. The initiation
of the SJF and its interaction with the SAF reflect the evolving plate boundary zone as it continuously seeks the most efficient
way to accommodate the relative plate motion. |
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Keywords: | Strain localization fault interaction San Andreas Fault restraining bend finite-element model |
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