气候变化领域集成服务门户(CCPortal): Pervasive low-velocity layer atop the 410-km discontinuity beneath the northwest Pacific subduction zone: Implications for rheology and geodynamics

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DOI	10.1016/j.epsl.2020.116642
	Pervasive low-velocity layer atop the 410-km discontinuity beneath the northwest Pacific subduction zone: Implications for rheology and geodynamics
	Han G.; Li J.; Guo G.; Mooney W.D.; Karato S.-I.; Yuen D.A.
发表日期	2021
ISSN	0012821X
卷号	554
英文摘要	Regional triplication waveforms of five intermediate-depth events are modeled to simultaneously obtain the compressional (P) and shear (SH) wave velocity structure beneath northwestern Pacific subduction zone. Both the P- and SH-wave velocity models for three different sub-regions show a low-velocity layer (LVL) with a thickness of ∼55-80 km lying above the 410-km discontinuity with a ∼900 km lateral extent from the Japan Sea to the northeastern Asian continental margin. With the dihedral angle approaching to zero around 400 km, a minute amount of melt atop the 410-km discontinuity caused by the hydrous slab might completely wet olivine grain boundaries and result in a low seismic velocity layer in this specific subduction zone. This mechanism suggests that the 410-LVL is a low viscosity zone that would partially decouple the upper mantle from the transition zone. We infer that the widespread 410-LVL provides evidence for a water-bearing mantle transition zone beneath the western Pacific subduction zone. © 2020 Elsevier B.V.
关键词	low velocity layer atop the 410 mantle transition zone Northwest Pacific subduction zone water-bearing MTZ waveform modeling wetting of grain boundary
英文关键词	Acoustic wave velocity; Dihedral angle; Grain boundaries; Shear waves; Silicate minerals; Wave propagation; 410-km discontinuity; Continental margin; Intermediate depths; Low velocity layers; Low viscosity zone; Mantle transition zone; Seismic velocities; Subduction zones; Shear flow; continental margin; geodynamics; low velocity zone; mantle structure; rheology; seismic velocity; seismic wave; subduction zone; waveform analysis; Pacific Ocean; Pacific Ocean (Northwest)
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203113
作者单位	Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China; Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing, 100029, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China; Mohe Observatory of Geophysics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China; United States Geological Survey, MS 977, 345 Middlefield Road, Menlo Park, CA 94025, United States; Department of Earth and Planetary Sciences, Yale University, New Haven, CT 06520, United States; Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, United States; Department of Computer Science, Geosciences, Ocean University of China, Shandong, Qingdao 266003, China
推荐引用方式 GB/T 7714	Han G.,Li J.,Guo G.,et al. Pervasive low-velocity layer atop the 410-km discontinuity beneath the northwest Pacific subduction zone: Implications for rheology and geodynamics[J],2021,554.
APA	Han G.,Li J.,Guo G.,Mooney W.D.,Karato S.-I.,&Yuen D.A..(2021).Pervasive low-velocity layer atop the 410-km discontinuity beneath the northwest Pacific subduction zone: Implications for rheology and geodynamics.Earth and Planetary Science Letters,554.
MLA	Han G.,et al."Pervasive low-velocity layer atop the 410-km discontinuity beneath the northwest Pacific subduction zone: Implications for rheology and geodynamics".Earth and Planetary Science Letters 554(2021).