Seismic anisotropy of East Antarctica from shear-wave splitting: Spatially varying contributions from lithosphere structural fabric and mantle flow?
Seismic anisotropy is investigated across the previously unstudied region of central East Antarctica including new coastal locations and remote, temporary stations far inland. Shear-wave splitting parameters are determined using core refracted phases from earthquakes occurring at teleseismic distanc...
Published in: | Earth and Planetary Science Letters |
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Online Access: | https://eprints.utas.edu.au/6692/ https://eprints.utas.edu.au/6692/1/EPSL_2008_Reading_Heintz.pdf https://doi.org/10.1016/j.epsl.2008.01.041 |
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ftunivtasmania:oai:eprints.utas.edu.au:6692 2023-05-15T13:36:46+02:00 Seismic anisotropy of East Antarctica from shear-wave splitting: Spatially varying contributions from lithosphere structural fabric and mantle flow? Reading, AM Heintz, M 2008-02-15 application/pdf https://eprints.utas.edu.au/6692/ https://eprints.utas.edu.au/6692/1/EPSL_2008_Reading_Heintz.pdf https://doi.org/10.1016/j.epsl.2008.01.041 en eng https://eprints.utas.edu.au/6692/1/EPSL_2008_Reading_Heintz.pdf Reading, AM orcid:0000-0002-9316-7605 and Heintz, M 2008 , 'Seismic anisotropy of East Antarctica from shear-wave splitting: Spatially varying contributions from lithosphere structural fabric and mantle flow?' , Earth and Planetary Sciences Letters, vol. 268, no. 3 , pp. 433-443 , doi:10.1016/j.epsl.2008.01.041 <http://dx.doi.org/10.1016/j.epsl.2008.01.041>. cc_utas 260200 Geophysics 260100 Geology 260000 Earth Sciences shear-wave splitting anisotropy East Antarctica absolute plate motion trans-tensional rifting Gondwana breakup Article PeerReviewed 2008 ftunivtasmania https://doi.org/10.1016/j.epsl.2008.01.041 2020-05-30T07:20:29Z Seismic anisotropy is investigated across the previously unstudied region of central East Antarctica including new coastal locations and remote, temporary stations far inland. Shear-wave splitting parameters are determined using core refracted phases from earthquakes occurring at teleseismic distances. New results are obtained from stations of the SSCUA temporary deployment in central East Antarctica (the greater Lambert Glacier basin) and also from permanent stations at Mawson and Casey. The pattern, for the coastal stations, shows that the orientation of the polarisation plane of the fast S-wave is parallel to the general trend of the continental margin of central East Antarctica. The remote stations, further inland, show fast directions that are not parallel to the continental margin and change more from station to station. These results are discussed, together with previous results of shear-wave splitting studies from other regions of East Antarctica in the light of a revised absolute plate motion (APM). In Dronning Maud Land and Victoria Land, the APM vectors are larger than in the Lambert Glacier region and strain associated with mantle flow could be contributing to observed anisotropy in these regions. The margin-parallel anisotropy observed at the coastal stations in central East Antarctica is likely to be caused by a combination of pre-existing lineations, and an additional component associated with trans-tensional rifting at the breakup of Gondwana. The more variable fast directions of the inland stations are likely to be caused by upper lithospheric remnant anisotropy of ancient lithospheric blocks, possibly with a component from the failed rifting associated with the trans-tensional basin of the present-day Lambert Glacier. Article in Journal/Newspaper Antarc* Antarctica Dronning Maud Land East Antarctica Lambert Glacier Victoria Land University of Tasmania: UTas ePrints East Antarctica Dronning Maud Land Victoria Land Lambert Glacier ENVELOPE(67.490,67.490,-73.065,-73.065) Earth and Planetary Science Letters 268 3-4 433 443 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
260200 Geophysics 260100 Geology 260000 Earth Sciences shear-wave splitting anisotropy East Antarctica absolute plate motion trans-tensional rifting Gondwana breakup |
spellingShingle |
260200 Geophysics 260100 Geology 260000 Earth Sciences shear-wave splitting anisotropy East Antarctica absolute plate motion trans-tensional rifting Gondwana breakup Reading, AM Heintz, M Seismic anisotropy of East Antarctica from shear-wave splitting: Spatially varying contributions from lithosphere structural fabric and mantle flow? |
topic_facet |
260200 Geophysics 260100 Geology 260000 Earth Sciences shear-wave splitting anisotropy East Antarctica absolute plate motion trans-tensional rifting Gondwana breakup |
description |
Seismic anisotropy is investigated across the previously unstudied region of central East Antarctica including new coastal locations and remote, temporary stations far inland. Shear-wave splitting parameters are determined using core refracted phases from earthquakes occurring at teleseismic distances. New results are obtained from stations of the SSCUA temporary deployment in central East Antarctica (the greater Lambert Glacier basin) and also from permanent stations at Mawson and Casey. The pattern, for the coastal stations, shows that the orientation of the polarisation plane of the fast S-wave is parallel to the general trend of the continental margin of central East Antarctica. The remote stations, further inland, show fast directions that are not parallel to the continental margin and change more from station to station. These results are discussed, together with previous results of shear-wave splitting studies from other regions of East Antarctica in the light of a revised absolute plate motion (APM). In Dronning Maud Land and Victoria Land, the APM vectors are larger than in the Lambert Glacier region and strain associated with mantle flow could be contributing to observed anisotropy in these regions. The margin-parallel anisotropy observed at the coastal stations in central East Antarctica is likely to be caused by a combination of pre-existing lineations, and an additional component associated with trans-tensional rifting at the breakup of Gondwana. The more variable fast directions of the inland stations are likely to be caused by upper lithospheric remnant anisotropy of ancient lithospheric blocks, possibly with a component from the failed rifting associated with the trans-tensional basin of the present-day Lambert Glacier. |
format |
Article in Journal/Newspaper |
author |
Reading, AM Heintz, M |
author_facet |
Reading, AM Heintz, M |
author_sort |
Reading, AM |
title |
Seismic anisotropy of East Antarctica from shear-wave splitting: Spatially varying contributions from lithosphere structural fabric and mantle flow? |
title_short |
Seismic anisotropy of East Antarctica from shear-wave splitting: Spatially varying contributions from lithosphere structural fabric and mantle flow? |
title_full |
Seismic anisotropy of East Antarctica from shear-wave splitting: Spatially varying contributions from lithosphere structural fabric and mantle flow? |
title_fullStr |
Seismic anisotropy of East Antarctica from shear-wave splitting: Spatially varying contributions from lithosphere structural fabric and mantle flow? |
title_full_unstemmed |
Seismic anisotropy of East Antarctica from shear-wave splitting: Spatially varying contributions from lithosphere structural fabric and mantle flow? |
title_sort |
seismic anisotropy of east antarctica from shear-wave splitting: spatially varying contributions from lithosphere structural fabric and mantle flow? |
publishDate |
2008 |
url |
https://eprints.utas.edu.au/6692/ https://eprints.utas.edu.au/6692/1/EPSL_2008_Reading_Heintz.pdf https://doi.org/10.1016/j.epsl.2008.01.041 |
long_lat |
ENVELOPE(67.490,67.490,-73.065,-73.065) |
geographic |
East Antarctica Dronning Maud Land Victoria Land Lambert Glacier |
geographic_facet |
East Antarctica Dronning Maud Land Victoria Land Lambert Glacier |
genre |
Antarc* Antarctica Dronning Maud Land East Antarctica Lambert Glacier Victoria Land |
genre_facet |
Antarc* Antarctica Dronning Maud Land East Antarctica Lambert Glacier Victoria Land |
op_relation |
https://eprints.utas.edu.au/6692/1/EPSL_2008_Reading_Heintz.pdf Reading, AM orcid:0000-0002-9316-7605 and Heintz, M 2008 , 'Seismic anisotropy of East Antarctica from shear-wave splitting: Spatially varying contributions from lithosphere structural fabric and mantle flow?' , Earth and Planetary Sciences Letters, vol. 268, no. 3 , pp. 433-443 , doi:10.1016/j.epsl.2008.01.041 <http://dx.doi.org/10.1016/j.epsl.2008.01.041>. |
op_rights |
cc_utas |
op_doi |
https://doi.org/10.1016/j.epsl.2008.01.041 |
container_title |
Earth and Planetary Science Letters |
container_volume |
268 |
container_issue |
3-4 |
container_start_page |
433 |
op_container_end_page |
443 |
_version_ |
1766083818706436096 |