globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2021.228944
论文题名:
Yield failure of the subducting plate at the Mariana Trench
作者: Zhang J.; Zhang F.; Lin J.; Yang H.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 814
语种: 英语
中文关键词: 3-D plate bending ; Earthquakes ; Mariana trench ; Numerical simulation ; Yield zone depth
英文关键词: Budget control ; Earthquakes ; Fault slips ; Hydration ; Intraplate earthquakes ; Plate bending deformations ; Plate deflections ; Plate interfaces ; Seismic behavior ; Seismic velocities ; Subducting plate ; Subduction zones ; Bending (deformation) ; bending ; depth ; failure mechanism ; Pacific plate ; plate tectonics ; seismic velocity ; seismic zone ; subduction ; Mariana Trench ; Pacific Ocean
英文摘要: Two tectonic plates converge at subduction zones where the subducting plate bends. Flexural bending of a subducting plate at a trench results in pervasive normal faulting, providing conduits for plate hydration and influencing the water budget and seismic behavior of the plate interface. 2-D plate bending simulations have demonstrated high strains due to strong bending may result in loss of strength of the lithosphere and intraplate earthquakes near the trench axis. However 3-D plate bending deformation may affect the along-strike slab pull force, especially when the deflection changes along the trench. Here we simulated the 3-D plate bending deformation and calculated bending stresses, and brittle failure of the Pacific plate at the Mariana Trench. We find that both the plate deflection and the yield zone depth (~16–20 km) increases from the northern to southern Mariana Trench. The water flux in the plate at the southern Mariana Trench is estimated to be about 15% greater than that of the northern Mariana Trench. By comparing with 2-D models, we further find that the 2-D approaches may undereastimate the yield zone depth as they ignored the along-trench effects of plate deflection. The new results provide a self-consistent framework for interpretation of the observed surface normal faults, extensional earthquakes, and the inferred hydration of the subducting plate as constrained by seismic velocity anomalies. © 2021 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170938
Appears in Collections:气候变化与战略

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作者单位: Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou, 510301, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, 511458, China; China-Pakistan Joint Research Center on Earth Sciences, CAS-HEC, Islamabad, 45320, Pakistan; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China; Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, 518057, China; Earth System Science Program, The Chinese University of Hong Kong, Hong Kong

Recommended Citation:
Zhang J.,Zhang F.,Lin J.,et al. Yield failure of the subducting plate at the Mariana Trench[J]. Tectonophysics,2021-01-01,814
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