DOI: 10.1002/2015GL067019
论文题名: Multiscale model of global inner-core anisotropy induced by hcp alloy plasticity
作者: Lincot A. ; Cardin Ph. ; Deguen R. ; Merkel S.
刊名: Geophysical Research Letters
ISSN: 0094-9403
EISSN: 1944-9134
出版年: 2016
卷: 43, 期: 3 起始页码: 1084
结束页码: 1091
语种: 英语
英文关键词: Fe alloy
; hcp
; inner-core anisotropy
; inner-core formation
; plastic deformation
; polycrystal plasticity
Scopus关键词: Monte Carlo methods
; Plastic deformation
; Plasticity
; Polycrystals
; Seismic prospecting
; Seismology
; Single crystals
; Surface morphology
; Elastic anisotropy
; Hexagonal close packed structure
; Inner core
; Multi-scale Modeling
; Polycrystal plasticity
; Seismic anisotropy
; Seismic measurements
; Seismic observation
; Anisotropy
; alloy
; Earth rotation
; induced response
; inner core
; iron
; Monte Carlo analysis
; plastic deformation
; plasticity
; seismic anisotropy
; seismic method
英文摘要: The Earth's solid inner core exhibits a global seismic anisotropy of several percents. It results from a coherent alignment of anisotropic Fe alloy crystals through the inner-core history that can be sampled by present-day seismic observations. By combining self-consistent polycrystal plasticity, inner-core formation models, Monte-Carlo search for elastic moduli, and simulations of seismic measurements, we introduce a multiscale model that can reproduce a global seismic anisotropy of several percents aligned with the Earth's rotation axis. Conditions for a successful model are an hexagonal close packed structure for the inner-core Fe alloy, plastic deformation by pyramidal 〈c + a〉 slip, and large-scale flow induced by a low-degree inner-core formation model. For global anisotropies ranging between 1 and 3%, the elastic anisotropy in the single crystal ranges from 5 to 20% with larger velocities along the c axis. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84961286500&doi=10.1002%2f2015GL067019&partnerID=40&md5=6058144aaec92ed3cf37c343e5f9b30f
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10366
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: ISTerre, Université Grenoble Alpes, CNRS, Grenoble, France
Recommended Citation:
Lincot A.,Cardin Ph.,Deguen R.,et al. Multiscale model of global inner-core anisotropy induced by hcp alloy plasticity[J]. Geophysical Research Letters,2016-01-01,43(3).