气候变化领域集成服务门户(CCPortal): Deep Ductile Shear Zone Facilitates Near-Orthogonal Strike-Slip Faulting in a Thin Brittle Lithosphere

CCPortal

DOI	10.1029/2020GL090744
	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
推荐引用方式 GB/T 7714	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).