Seismic anisotropy of East Antarctica from shear-wave splitting: Spatially varying contributions from lithospheric 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 |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier BV
2008
|
Subjects: | |
Online Access: | https://doi.org/10.1016/j.epsl.2008.01.041 http://ecite.utas.edu.au/53063 |
id |
ftunivtasecite:oai:ecite.utas.edu.au:53063 |
---|---|
record_format |
openpolar |
spelling |
ftunivtasecite:oai:ecite.utas.edu.au:53063 2023-05-15T13:40:51+02:00 Seismic anisotropy of East Antarctica from shear-wave splitting: Spatially varying contributions from lithospheric structural fabric and mantle flow? Reading, AM Heintz, M 2008 https://doi.org/10.1016/j.epsl.2008.01.041 http://ecite.utas.edu.au/53063 en eng Elsevier BV http://dx.doi.org/10.1016/j.epsl.2008.01.041 Reading, AM and Heintz, M, Seismic anisotropy of East Antarctica from shear-wave splitting: Spatially varying contributions from lithospheric structural fabric and mantle flow?, Earth and Planetary Science Letters, 268, (3-4) pp. 433-443. ISSN 0012-821X (2008) [Refereed Article] http://ecite.utas.edu.au/53063 Earth Sciences Geophysics Seismology and Seismic Exploration Refereed Article PeerReviewed 2008 ftunivtasecite https://doi.org/10.1016/j.epsl.2008.01.041 2019-12-13T21:26:27Z 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. 2008 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Antarc* Antarctica Dronning Maud Land East Antarctica Lambert Glacier Victoria Land eCite UTAS (University of Tasmania) 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 |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geophysics Seismology and Seismic Exploration |
spellingShingle |
Earth Sciences Geophysics Seismology and Seismic Exploration Reading, AM Heintz, M Seismic anisotropy of East Antarctica from shear-wave splitting: Spatially varying contributions from lithospheric structural fabric and mantle flow? |
topic_facet |
Earth Sciences Geophysics Seismology and Seismic Exploration |
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. 2008 Elsevier B.V. All rights reserved. |
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 lithospheric structural fabric and mantle flow? |
title_short |
Seismic anisotropy of East Antarctica from shear-wave splitting: Spatially varying contributions from lithospheric structural fabric and mantle flow? |
title_full |
Seismic anisotropy of East Antarctica from shear-wave splitting: Spatially varying contributions from lithospheric structural fabric and mantle flow? |
title_fullStr |
Seismic anisotropy of East Antarctica from shear-wave splitting: Spatially varying contributions from lithospheric structural fabric and mantle flow? |
title_full_unstemmed |
Seismic anisotropy of East Antarctica from shear-wave splitting: Spatially varying contributions from lithospheric structural fabric and mantle flow? |
title_sort |
seismic anisotropy of east antarctica from shear-wave splitting: spatially varying contributions from lithospheric structural fabric and mantle flow? |
publisher |
Elsevier BV |
publishDate |
2008 |
url |
https://doi.org/10.1016/j.epsl.2008.01.041 http://ecite.utas.edu.au/53063 |
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 |
http://dx.doi.org/10.1016/j.epsl.2008.01.041 Reading, AM and Heintz, M, Seismic anisotropy of East Antarctica from shear-wave splitting: Spatially varying contributions from lithospheric structural fabric and mantle flow?, Earth and Planetary Science Letters, 268, (3-4) pp. 433-443. ISSN 0012-821X (2008) [Refereed Article] http://ecite.utas.edu.au/53063 |
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_ |
1766141513063989248 |