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DOI10.1029/2020GL090744
Deep Ductile Shear Zone Facilitates Near-Orthogonal Strike-Slip Faulting in a Thin Brittle Lithosphere
Liang C.; Ampuero J.-P.; Pino Muñoz D.
发表日期2021
ISSN 0094-8276
卷号48期号:2
英文摘要Some active fault systems comprise near-orthogonal conjugate strike-slip faults, as highlighted by the 2019 Ridgecrest and the 2012 Indian Ocean earthquake sequences. In conventional Mohr-Coulomb failure theory, orthogonal faulting requires a zero frictional coefficient (pressure-insensitive), which is unlikely in the brittle lithosphere. The simulations developed here show that near-orthogonal faults can form in the brittle layer by inheriting the geometry of orthogonal shear zones nucleated in the deep ductile (pressure-insensitive) layer. In particular, if the brittle layer is sufficiently thinner than the ductile fault root, near-orthogonal faulting is preserved at the surface. The preservation is further facilitated by a depth-dependent strength in the brittle layer. Conversely, faults nucleated within the brittle layer are unlikely to form at orthogonal angles. Our model thus offers a possible explanation for orthogonal strike-slip faulting and reveals the significant interactions between the structure of faults in the brittle upper lithosphere and their deep ductile roots. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词Friction; Strike-slip faults; Active fault; Brittle layers; Depth dependents; Ductile shear zone; Earthquake sequences; Frictional coefficients; Mohr-Coulomb failures; Strike slip faulting; Fault slips
语种英语
来源期刊Geophysical Research Letters
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/169180
作者单位Géoazur, Université Côte d'Azur, IRD, CNRS, Observatoire de la Côte d'Azur, Valbonne, France; MINES ParisTech, PSL Research University, Centre de Mise en Forme des Matériaux, CNRS UMR 7635, Sophia Antipolis, France
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Liang C.,Ampuero J.-P.,Pino Muñoz D.. Deep Ductile Shear Zone Facilitates Near-Orthogonal Strike-Slip Faulting in a Thin Brittle Lithosphere[J],2021,48(2).
APA Liang C.,Ampuero J.-P.,&Pino Muñoz D..(2021).Deep Ductile Shear Zone Facilitates Near-Orthogonal Strike-Slip Faulting in a Thin Brittle Lithosphere.Geophysical Research Letters,48(2).
MLA Liang C.,et al."Deep Ductile Shear Zone Facilitates Near-Orthogonal Strike-Slip Faulting in a Thin Brittle Lithosphere".Geophysical Research Letters 48.2(2021).
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