P- and S-wave velocity structure of central West Antarctica: Implications for the tectonic evolution of the West Antarctic Rift System
New P- and S-wave velocity models of the upper mantle from 100 to 400 km depth beneath the central portions of West Antarctica, obtained by inverting relative travel-times from teleseismic earthquakes recorded on Polar Earth Observing Network (POLENET/ANET) and UK Antarctic Network (UKANET) seismic...
Published in: | Earth and Planetary Science Letters |
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Online Access: | https://digitalcommons.cwu.edu/geological_sciences/130 https://doi.org/10.1016/j.epsl.2020.116437 |
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ftcwashingtonuni:oai:digitalcommons.cwu.edu:geological_sciences-1130 2023-05-15T13:47:32+02:00 P- and S-wave velocity structure of central West Antarctica: Implications for the tectonic evolution of the West Antarctic Rift System Lucas, Erica M. Soto, David Nyblade, Andrew A. Lloyd, Andrew J. Aster, Richard C. Wiens, Douglas A. O'Donnell, John Paul Stuart, Graham W. Wilson, Terry J. Dalziel, Ian W. Winberry, J. Paul Huerta, Audrey D. 2020-09-15T07:00:00Z https://digitalcommons.cwu.edu/geological_sciences/130 https://doi.org/10.1016/j.epsl.2020.116437 unknown ScholarWorks@CWU https://digitalcommons.cwu.edu/geological_sciences/130 http://ezp.lib.cwu.edu/login?url=http://dx.doi.org/10.1016/j.epsl.2020.116437 © 2020 Elsevier B.V. All rights reserved. Geological Sciences Faculty Scholarship Antarctica West Antarctic Rift System mantle structure seismic tomography West Antarctic Ice Sheet Geophysics and Seismology Glaciology Tectonics and Structure text 2020 ftcwashingtonuni https://doi.org/10.1016/j.epsl.2020.116437 2022-10-20T20:30:21Z New P- and S-wave velocity models of the upper mantle from 100 to 400 km depth beneath the central portions of West Antarctica, obtained by inverting relative travel-times from teleseismic earthquakes recorded on Polar Earth Observing Network (POLENET/ANET) and UK Antarctic Network (UKANET) seismic stations between 2007 and 2017, reveal a heterogeneous upper mantle. A low velocity anomaly (−1.0% Vp; −2.0% Vs) imaged beneath Marie Byrd Land is attributed to thermally perturbed upper mantle of possible plume origin, and a low velocity anomaly imaged beneath the Pine Island Glacier and the mouth of Thwaites Glacier is interpreted as a rift-related thermal structure that may include warm mantle flowing from Marie Byrd Land. High velocity anomalies (≤0.8% Vp; 1.5% Vs) imaged in the central portion of the West Antarctic Rift System indicate the presence of lithosphere unmodified by tectonic activity since the Late Cretaceous formation of the rift system. Within the region of high velocities, localized low velocity anomalies beneath parts of the Bentley Subglacial Trench are suggestive of focused Cenozoic rifting. The models also show variable velocity structure beneath the Haag-Ellsworth Whitmore crustal block and low velocities beneath the Thurston Island-Eights Coast crustal block. The heterogenous upper mantle structure of central West Antarctica indicates that upper mantle temperatures could vary by 100 K or more over distances of less than 100 km, which may add complexity to solid earth-ice interactions and influence basal ice sheet conditions. Text Antarc* Antarctic Antarctica Ice Sheet Marie Byrd Land Pine Island Pine Island Glacier Thurston Island Thwaites Glacier West Antarctica Central Washington University: ScholarWorks Anet ENVELOPE(27.987,27.987,65.920,65.920) Antarctic Bentley Subglacial Trench ENVELOPE(-105.000,-105.000,-80.000,-80.000) Byrd Eights Coast ENVELOPE(-96.000,-96.000,-73.500,-73.500) Haag ENVELOPE(-79.000,-79.000,-77.667,-77.667) Marie Byrd Land ENVELOPE(-130.000,-130.000,-78.000,-78.000) Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) Thurston ENVELOPE(-97.500,-97.500,-71.833,-71.833) Thurston Island ENVELOPE(-99.000,-99.000,-72.167,-72.167) Thwaites Glacier ENVELOPE(-106.750,-106.750,-75.500,-75.500) West Antarctic Ice Sheet West Antarctica Earth and Planetary Science Letters 546 116437 |
institution |
Open Polar |
collection |
Central Washington University: ScholarWorks |
op_collection_id |
ftcwashingtonuni |
language |
unknown |
topic |
Antarctica West Antarctic Rift System mantle structure seismic tomography West Antarctic Ice Sheet Geophysics and Seismology Glaciology Tectonics and Structure |
spellingShingle |
Antarctica West Antarctic Rift System mantle structure seismic tomography West Antarctic Ice Sheet Geophysics and Seismology Glaciology Tectonics and Structure Lucas, Erica M. Soto, David Nyblade, Andrew A. Lloyd, Andrew J. Aster, Richard C. Wiens, Douglas A. O'Donnell, John Paul Stuart, Graham W. Wilson, Terry J. Dalziel, Ian W. Winberry, J. Paul Huerta, Audrey D. P- and S-wave velocity structure of central West Antarctica: Implications for the tectonic evolution of the West Antarctic Rift System |
topic_facet |
Antarctica West Antarctic Rift System mantle structure seismic tomography West Antarctic Ice Sheet Geophysics and Seismology Glaciology Tectonics and Structure |
description |
New P- and S-wave velocity models of the upper mantle from 100 to 400 km depth beneath the central portions of West Antarctica, obtained by inverting relative travel-times from teleseismic earthquakes recorded on Polar Earth Observing Network (POLENET/ANET) and UK Antarctic Network (UKANET) seismic stations between 2007 and 2017, reveal a heterogeneous upper mantle. A low velocity anomaly (−1.0% Vp; −2.0% Vs) imaged beneath Marie Byrd Land is attributed to thermally perturbed upper mantle of possible plume origin, and a low velocity anomaly imaged beneath the Pine Island Glacier and the mouth of Thwaites Glacier is interpreted as a rift-related thermal structure that may include warm mantle flowing from Marie Byrd Land. High velocity anomalies (≤0.8% Vp; 1.5% Vs) imaged in the central portion of the West Antarctic Rift System indicate the presence of lithosphere unmodified by tectonic activity since the Late Cretaceous formation of the rift system. Within the region of high velocities, localized low velocity anomalies beneath parts of the Bentley Subglacial Trench are suggestive of focused Cenozoic rifting. The models also show variable velocity structure beneath the Haag-Ellsworth Whitmore crustal block and low velocities beneath the Thurston Island-Eights Coast crustal block. The heterogenous upper mantle structure of central West Antarctica indicates that upper mantle temperatures could vary by 100 K or more over distances of less than 100 km, which may add complexity to solid earth-ice interactions and influence basal ice sheet conditions. |
format |
Text |
author |
Lucas, Erica M. Soto, David Nyblade, Andrew A. Lloyd, Andrew J. Aster, Richard C. Wiens, Douglas A. O'Donnell, John Paul Stuart, Graham W. Wilson, Terry J. Dalziel, Ian W. Winberry, J. Paul Huerta, Audrey D. |
author_facet |
Lucas, Erica M. Soto, David Nyblade, Andrew A. Lloyd, Andrew J. Aster, Richard C. Wiens, Douglas A. O'Donnell, John Paul Stuart, Graham W. Wilson, Terry J. Dalziel, Ian W. Winberry, J. Paul Huerta, Audrey D. |
author_sort |
Lucas, Erica M. |
title |
P- and S-wave velocity structure of central West Antarctica: Implications for the tectonic evolution of the West Antarctic Rift System |
title_short |
P- and S-wave velocity structure of central West Antarctica: Implications for the tectonic evolution of the West Antarctic Rift System |
title_full |
P- and S-wave velocity structure of central West Antarctica: Implications for the tectonic evolution of the West Antarctic Rift System |
title_fullStr |
P- and S-wave velocity structure of central West Antarctica: Implications for the tectonic evolution of the West Antarctic Rift System |
title_full_unstemmed |
P- and S-wave velocity structure of central West Antarctica: Implications for the tectonic evolution of the West Antarctic Rift System |
title_sort |
p- and s-wave velocity structure of central west antarctica: implications for the tectonic evolution of the west antarctic rift system |
publisher |
ScholarWorks@CWU |
publishDate |
2020 |
url |
https://digitalcommons.cwu.edu/geological_sciences/130 https://doi.org/10.1016/j.epsl.2020.116437 |
long_lat |
ENVELOPE(27.987,27.987,65.920,65.920) ENVELOPE(-105.000,-105.000,-80.000,-80.000) ENVELOPE(-96.000,-96.000,-73.500,-73.500) ENVELOPE(-79.000,-79.000,-77.667,-77.667) ENVELOPE(-130.000,-130.000,-78.000,-78.000) ENVELOPE(-101.000,-101.000,-75.000,-75.000) ENVELOPE(-97.500,-97.500,-71.833,-71.833) ENVELOPE(-99.000,-99.000,-72.167,-72.167) ENVELOPE(-106.750,-106.750,-75.500,-75.500) |
geographic |
Anet Antarctic Bentley Subglacial Trench Byrd Eights Coast Haag Marie Byrd Land Pine Island Glacier Thurston Thurston Island Thwaites Glacier West Antarctic Ice Sheet West Antarctica |
geographic_facet |
Anet Antarctic Bentley Subglacial Trench Byrd Eights Coast Haag Marie Byrd Land Pine Island Glacier Thurston Thurston Island Thwaites Glacier West Antarctic Ice Sheet West Antarctica |
genre |
Antarc* Antarctic Antarctica Ice Sheet Marie Byrd Land Pine Island Pine Island Glacier Thurston Island Thwaites Glacier West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Marie Byrd Land Pine Island Pine Island Glacier Thurston Island Thwaites Glacier West Antarctica |
op_source |
Geological Sciences Faculty Scholarship |
op_relation |
https://digitalcommons.cwu.edu/geological_sciences/130 http://ezp.lib.cwu.edu/login?url=http://dx.doi.org/10.1016/j.epsl.2020.116437 |
op_rights |
© 2020 Elsevier B.V. All rights reserved. |
op_doi |
https://doi.org/10.1016/j.epsl.2020.116437 |
container_title |
Earth and Planetary Science Letters |
container_volume |
546 |
container_start_page |
116437 |
_version_ |
1766247276069519360 |