DOI: 10.1002/grl.50873
论文题名: Intrinsic versus extrinsic seismic anisotropy: The radial anisotropy in reference Earth models
作者: Wang N. ; Montagner J.-P. ; Fichtner A. ; Capdeville Y.
刊名: Geophysical Research Letters
ISSN: 0094-8643
EISSN: 1944-8374
出版年: 2013
卷: 40, 期: 16 起始页码: 4284
结束页码: 4288
语种: 英语
英文关键词: extrinsic anisotropy
; fine layering
; lattice or crystallographic preferred orientation (LPO, CPO)
; periodic isotropic two-layered (PITL) model
; seismic anisotropy
Scopus关键词: Crystallographic preferred orientations
; Different mechanisms
; fine layering
; Intrinsic anisotropy
; Lithospheric anisotropy
; Preliminary reference earth models
; Radial anisotropy
; Seismic anisotropy
; Earth sciences
; Geophysics
; Anisotropy
; crystallography
; isotropy
; lithosphere
; melting
; numerical model
; one-dimensional modeling
; seismic anisotropy
英文摘要: Seismic anisotropy usually arises from different mechanisms, which include lattice or crystallographic preferred orientation (LPO, CPO), alignment of cracks with or without fluid inclusions, fine layering, or partial melting. This makes the interpretation of anisotropy in terms of "intrinsic" (produced by LPO, CPO) versus "extrinsic" (produced by other mechanisms) properties difficult and nonunique. The radial anisotropy in the one-dimensional, global spherically symmetric reference Earth is usually claimed to be intrinsic. Here we explore whether the radial anisotropy in one-dimensional reference Earth models including preliminary reference Earth model (PREM) and the constrained reference Earth model ACY400 contains extrinsic anisotropy, especially in relation to fine layering. We conclude that as well as intrinsic anisotropy, extrinsic anisotropy introduced by finely layered models, can be considered to explain the lithospheric anisotropy in PREM, but cannot explain alone its asthenospheric anisotropy. We also find that radial anisotropy in model ACY400 is mainly intrinsic due to its petrological constraints. Key Points To interpret anisotropy in terms of intrinsic versus extrinsic properties Fine layering can contribute to the lithospheric anisotropy in PREM Radial anisotropy in model ACY400 is mainly intrinsic. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883089433&doi=10.1002%2fgrl.50873&partnerID=40&md5=04421db0cfa938edffa75cd0ee96cb49
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5907
Appears in Collections: 气候减缓与适应
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作者单位: Institut de Physique du Globe de Paris, 1 Rue Jussieu, Paris CEDEX 05 FR-75238, France
Recommended Citation:
Wang N.,Montagner J.-P.,Fichtner A.,et al. Intrinsic versus extrinsic seismic anisotropy: The radial anisotropy in reference Earth models[J]. Geophysical Research Letters,2013-01-01,40(16).