Seismic wave propagation in anisotropic ice – Part 2: Effects of crystal anisotropy in geophysical data
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. Vel...
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ftdoajarticles:oai:doaj.org/article:aa63d87fc072480bbb621d4f76cfcded 2023-05-15T13:47:24+02:00 Seismic wave propagation in anisotropic ice – Part 2: Effects of crystal anisotropy in geophysical data A. Diez O. Eisen C. Hofstede A. Lambrecht C. Mayer H. Miller D. Steinhage T. Binder I. Weikusat 2015-02-01T00:00:00Z https://doi.org/10.5194/tc-9-385-2015 https://doaj.org/article/aa63d87fc072480bbb621d4f76cfcded EN eng Copernicus Publications http://www.the-cryosphere.net/9/385/2015/tc-9-385-2015.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-9-385-2015 https://doaj.org/article/aa63d87fc072480bbb621d4f76cfcded The Cryosphere, Vol 9, Iss 1, Pp 385-398 (2015) Environmental sciences GE1-350 Geology QE1-996.5 article 2015 ftdoajarticles https://doi.org/10.5194/tc-9-385-2015 2022-12-31T01:36:05Z 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. Article in Journal/Newspaper Antarc* Antarctica ice core The Cryosphere Directory of Open Access Journals: DOAJ Articles The Cryosphere 9 1 385 398 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
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Environmental sciences GE1-350 Geology QE1-996.5 A. Diez O. Eisen C. Hofstede A. Lambrecht C. Mayer H. Miller D. Steinhage T. Binder I. Weikusat Seismic wave propagation in anisotropic ice – Part 2: Effects of crystal anisotropy in geophysical data |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
A. Diez O. Eisen C. Hofstede A. Lambrecht C. Mayer H. Miller D. Steinhage T. Binder I. Weikusat |
author_facet |
A. Diez O. Eisen C. Hofstede A. Lambrecht C. Mayer H. Miller D. Steinhage T. Binder I. Weikusat |
author_sort |
A. Diez |
title |
Seismic wave propagation in anisotropic ice – Part 2: Effects of crystal anisotropy in geophysical data |
title_short |
Seismic wave propagation in anisotropic ice – Part 2: Effects of crystal anisotropy in geophysical data |
title_full |
Seismic wave propagation in anisotropic ice – Part 2: Effects of crystal anisotropy in geophysical data |
title_fullStr |
Seismic wave propagation in anisotropic ice – Part 2: Effects of crystal anisotropy in geophysical data |
title_full_unstemmed |
Seismic wave propagation in anisotropic ice – Part 2: Effects of crystal anisotropy in geophysical data |
title_sort |
seismic wave propagation in anisotropic ice – part 2: effects of crystal anisotropy in geophysical data |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/tc-9-385-2015 https://doaj.org/article/aa63d87fc072480bbb621d4f76cfcded |
genre |
Antarc* Antarctica ice core The Cryosphere |
genre_facet |
Antarc* Antarctica ice core The Cryosphere |
op_source |
The Cryosphere, Vol 9, Iss 1, Pp 385-398 (2015) |
op_relation |
http://www.the-cryosphere.net/9/385/2015/tc-9-385-2015.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-9-385-2015 https://doaj.org/article/aa63d87fc072480bbb621d4f76cfcded |
op_doi |
https://doi.org/10.5194/tc-9-385-2015 |
container_title |
The Cryosphere |
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9 |
container_issue |
1 |
container_start_page |
385 |
op_container_end_page |
398 |
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1766247066158235648 |