气候变化领域集成服务门户(CCPortal): Seismic wave propagation in anisotropic ice - Part 2: Effects of crystal anisotropy in geophysical data

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DOI	10.5194/tc-9-385-2015
	Seismic wave propagation in anisotropic ice - Part 2: Effects of crystal anisotropy in geophysical data
	Diez A.; Eisen O.; Hofstede C.; Lambrecht A.; Mayer C.; Miller H.; Steinhage D.; Binder T.; Weikusat I.
发表日期	2015
ISSN	19940416
卷号	9 期号:1
英文摘要	We investigate the propagation of seismic waves in anisotropic ice. Two effects are important: (i) sudden changes in crystal orientation fabric (COF) lead to englacial reflections; (ii) the anisotropic fabric induces an angle dependency on the seismic velocities and, thus, recorded travel times. Velocities calculated from the polycrystal elasticity tensor derived for the anisotropic fabric from measured COF eigenvalues of the EDML ice core, Antarctica, show good agreement with the velocity trend determined from vertical seismic profiling. The agreement of the absolute velocity values, however, depends on the choice of the monocrystal elasticity tensor used for the calculation of the polycrystal properties. We make use of abrupt changes in COF as a common reflection mechanism for seismic and radar data below the firn-ice transition to determine COF-induced reflections in either data set by joint comparison with ice-core data. Our results highlight the possibility to complement regional radar surveys with local, surface-based seismic experiments to separate isochrones in radar data from other mechanisms. This is important for the reconnaissance of future ice-core drill sites, where accurate isochrone (i.e. non-COF) layer integrity allows for synchronization with other cores, as well as studies of ice dynamics considering non-homogeneous ice viscosity from preferred crystal orientations. © 2015 Author(s).
学科领域	anisotropic medium; crystal structure; eigenvalue; englacial process; radar; seismic reflection; seismic wave; vertical seismic profile; wave propagation; Antarctica
语种	英语
scopus关键词	anisotropic medium; crystal structure; eigenvalue; englacial process; radar; seismic reflection; seismic wave; vertical seismic profile; wave propagation; Antarctica
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/119952
作者单位	Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany; Karlsruhe Institute of Technology, Karlsruhe, Germany; Department Geosciences, University of Bremen, Bremen, Germany; Bavarian Academy for Sciences and Humanities, Munich, Germany; Interdisciplinary Center for Scientific Computing, University of Heidelberg, Heidelberg, Germany; Department of Geosciences, Eberhard Karls University of Tübingen, Tübingen, 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.,Hofstede C.,et al. Seismic wave propagation in anisotropic ice - Part 2: Effects of crystal anisotropy in geophysical data[J],2015,9(1).
APA	Diez A..,Eisen O..,Hofstede C..,Lambrecht A..,Mayer C..,...&Weikusat I..(2015).Seismic wave propagation in anisotropic ice - Part 2: Effects of crystal anisotropy in geophysical data.Cryosphere,9(1).
MLA	Diez A.,et al."Seismic wave propagation in anisotropic ice - Part 2: Effects of crystal anisotropy in geophysical data".Cryosphere 9.1(2015).