globalchange  > 影响、适应和脆弱性
DOI: 10.5194/tc-9-385-2015
Scopus记录号: 2-s2.0-84923323505
论文题名:
Seismic wave propagation in anisotropic ice - Part 2: Effects of crystal anisotropy in geophysical data
作者: Diez A; , Eisen O; , Hofstede C; , Lambrecht A; , Mayer C; , Miller H; , Steinhage D; , Binder T; , Weikusat I
刊名: Cryosphere
ISSN: 19940416
出版年: 2015
卷: 9, 期:1
起始页码: 385
结束页码: 398
语种: 英语
英文关键词: anisotropic medium ; crystal structure ; eigenvalue ; englacial process ; radar ; seismic reflection ; seismic wave ; vertical seismic profile ; wave propagation ; Antarctica
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).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75337
Appears in Collections:影响、适应和脆弱性
气候变化与战略

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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

Recommended Citation:
Diez A,, Eisen O,, Hofstede C,et al. Seismic wave propagation in anisotropic ice - Part 2: Effects of crystal anisotropy in geophysical data[J]. Cryosphere,2015-01-01,9(1)
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