气候变化领域集成服务门户(CCPortal): The Deformational Journey of the Nazca Slab From Seismic Anisotropy

CCPortal

DOI	10.1029/2020GL087398
	The Deformational Journey of the Nazca Slab From Seismic Anisotropy
	Agrawal S.; Eakin C.M.; Portner D.E.; Rodriguez E.E.; Beck S.L.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:11
英文摘要	The Andean subduction zone is an excellent place to study deformation within a subducting slab as a function of depth, owing to the varying and well-resolved geometry of the subducting Nazca slab beneath South America. Here we combine the results of source-side shear wave splitting with the latest regional tomography model to isolate intraslab raypaths and determine the spatial distribution of anisotropy within the Nazca slab. We observe that in the upper mantle, the intraslab anisotropy appears strongest where the slab is most contorted, suggesting a strong link between anisotropy and subduction-related slab deformation. We identify a second source of anisotropy (δt∼ 1 s) within the subducting slab at lower mantle depths (660–800 km). The surrounding mantle and transition zone appear largely isotropic, with deep anisotropy concentrated within the slab as it deforms while entering the higher-viscosity lower mantle. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Deformation; Shear flow; Shear waves; Seismic anisotropy; Shear wave splitting; Slab deformation; South America; Subducting slabs; Subduction zones; Transition zones; Upper mantle; Anisotropy; crustal deformation; deformation; lower mantle; S-wave; seismic anisotropy; slab; spatial distribution; subduction zone; tomography; transition zone; wave splitting; Ica; Nazca; Peru; South America
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/170315
作者单位	Research School of Earth Sciences, The Australian National University, Canberra, ACT, Australia; Department of Geosciences, University of Arizona, Tucson, AZ, United States; Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC, United States
推荐引用方式 GB/T 7714	Agrawal S.,Eakin C.M.,Portner D.E.,et al. The Deformational Journey of the Nazca Slab From Seismic Anisotropy[J],2020,47(11).
APA	Agrawal S.,Eakin C.M.,Portner D.E.,Rodriguez E.E.,&Beck S.L..(2020).The Deformational Journey of the Nazca Slab From Seismic Anisotropy.Geophysical Research Letters,47(11).
MLA	Agrawal S.,et al."The Deformational Journey of the Nazca Slab From Seismic Anisotropy".Geophysical Research Letters 47.11(2020).