气候变化领域集成服务门户(CCPortal): Seismic wave propagation in anisotropic ice - Part 1: Elasticity tensor and derived quantities from ice-core properties

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DOI	10.5194/tc-9-367-2015
	Seismic wave propagation in anisotropic ice - Part 1: Elasticity tensor and derived quantities from ice-core properties
	Diez A.; Eisen O.
发表日期	2015
ISSN	19940416
卷号	9 期号:1
英文摘要	A preferred orientation of the anisotropic ice crystals influences the viscosity of the ice bulk and the dynamic behaviour of glaciers and ice sheets. Knowledge about the distribution of crystal anisotropy is mainly provided by crystal orientation fabric (COF) data from ice cores. However, the developed anisotropic fabric influences not only the flow behaviour of ice but also the propagation of seismic waves. Two effects are important: (i) sudden changes in COF lead to englacial reflections, and (ii) the anisotropic fabric induces an angle dependency on the seismic velocities and, thus, recorded travel times. A framework is presented here to connect COF data from ice cores with the elasticity tensor to determine seismic velocities and reflection coefficients for cone and girdle fabrics. We connect the microscopic anisotropy of the crystals with the macroscopic anisotropy of the ice mass, observable with seismic methods. Elasticity tensors for different fabrics are calculated and used to investigate the influence of the anisotropic ice fabric on seismic velocities and reflection coefficients, englacially as well as for the ice-bed contact. Hence, it is possible to remotely determine the bulk ice anisotropy. © 2015 Author(s).
学科领域	elasticity; ice core; ice crystal; seismic anisotropy; seismic velocity; seismic wave; viscosity; wave propagation
语种	英语
scopus关键词	elasticity; ice core; ice crystal; seismic anisotropy; seismic velocity; seismic wave; viscosity; wave propagation
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119950
作者单位	Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany; Karlsruher Institut für Technologie, Karlsruhe, Germany; Fachbereich Geowissenschaften, Universität Bremen, Bremen, Germany; Scripps Institution of Oceanography, University of California, San Diego, United States
推荐引用方式 GB/T 7714	Diez A.,Eisen O.. Seismic wave propagation in anisotropic ice - Part 1: Elasticity tensor and derived quantities from ice-core properties[J],2015,9(1).
APA	Diez A.,&Eisen O..(2015).Seismic wave propagation in anisotropic ice - Part 1: Elasticity tensor and derived quantities from ice-core properties.Cryosphere,9(1).
MLA	Diez A.,et al."Seismic wave propagation in anisotropic ice - Part 1: Elasticity tensor and derived quantities from ice-core properties".Cryosphere 9.1(2015).