The crust and upper mantle structure of central and West Antarctica from Bayesian inversion of Rayleigh Wave and receiver functions
Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 123 (2018): 7824-7849, doi:10.1029/2017JB015346....
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Language: | English |
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John Wiley & Sons
2018
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Online Access: | https://hdl.handle.net/1912/10702 |
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/10702 2023-05-15T13:24:15+02:00 The crust and upper mantle structure of central and West Antarctica from Bayesian inversion of Rayleigh Wave and receiver functions Shen, Weisen Wiens, Douglas A. Anandakrishnan, Sridhar Aster, Richard C. Gerstoft, Peter Bromirski, Peter D. Hansen, Samantha E. Dalziel, Ian W. D. Heeszel, David S. Huerta, Audrey D. Nyblade, Andrew A. Stephen, Ralph A. Wilson, Terry J. Winberry, J. Paul 2018-09-22 https://hdl.handle.net/1912/10702 en_US eng John Wiley & Sons https://doi.org/10.1029/2017JB015346 Journal of Geophysical Research: Solid Earth 123 (2018): 7824-7849 https://hdl.handle.net/1912/10702 doi:10.1029/2017JB015346 Journal of Geophysical Research: Solid Earth 123 (2018): 7824-7849 doi:10.1029/2017JB015346 Seismology Crust and uppermost mantle Ambient noise tomography Antarctica Transantarctic Mountains Gamburtsev Mountains Article 2018 ftwhoas https://doi.org/10.1029/2017JB015346 2022-05-28T23:00:30Z Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 123 (2018): 7824-7849, doi:10.1029/2017JB015346. We construct a new seismic model for central and West Antarctica by jointly inverting Rayleigh wave phase and group velocities along with P wave receiver functions. Ambient noise tomography exploiting data from more than 200 seismic stations deployed over the past 18 years is used to construct Rayleigh wave phase and group velocity dispersion maps. Comparison between the ambient noise phase velocity maps with those constructed using teleseismic earthquakes confirms the accuracy of both results. These maps, together with P receiver function waveforms, are used to construct a new 3‐D shear velocity (Vs) model for the crust and uppermost mantle using a Bayesian Monte Carlo algorithm. The new 3‐D seismic model shows the dichotomy of the tectonically active West Antarctica (WANT) and the stable and ancient East Antarctica (EANT). In WANT, the model exhibits a slow uppermost mantle along the Transantarctic Mountains (TAMs) front, interpreted as the thermal effect from Cenozoic rifting. Beneath the southern TAMs, the slow uppermost mantle extends horizontally beneath the traditionally recognized EANT, hypothesized to be associated with lithospheric delamination. Thin crust and lithosphere observed along the Amundsen Sea coast and extending into the interior suggest involvement of these areas in Cenozoic rifting. EANT, with its relatively thick and cold crust and lithosphere marked by high Vs, displays a slower Vs anomaly beneath the Gamburtsev Subglacial Mountains in the uppermost mantle, which we hypothesize may be the signature of a compositionally anomalous body, perhaps remnant from a continental collision. National Science Foundation Grant Numbers: PLR‐1142518, PLR‐1246712, PLR 1246151, PLR‐1246416, PLR‐1744883, ... Article in Journal/Newspaper Amundsen Sea Antarc* Antarctica East Antarctica West Antarctica Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Amundsen Sea East Antarctica Gamburtsev Subglacial Mountains ENVELOPE(76.000,76.000,-80.500,-80.500) Transantarctic Mountains West Antarctica Journal of Geophysical Research: Solid Earth 123 9 7824 7849 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Seismology Crust and uppermost mantle Ambient noise tomography Antarctica Transantarctic Mountains Gamburtsev Mountains |
spellingShingle |
Seismology Crust and uppermost mantle Ambient noise tomography Antarctica Transantarctic Mountains Gamburtsev Mountains Shen, Weisen Wiens, Douglas A. Anandakrishnan, Sridhar Aster, Richard C. Gerstoft, Peter Bromirski, Peter D. Hansen, Samantha E. Dalziel, Ian W. D. Heeszel, David S. Huerta, Audrey D. Nyblade, Andrew A. Stephen, Ralph A. Wilson, Terry J. Winberry, J. Paul The crust and upper mantle structure of central and West Antarctica from Bayesian inversion of Rayleigh Wave and receiver functions |
topic_facet |
Seismology Crust and uppermost mantle Ambient noise tomography Antarctica Transantarctic Mountains Gamburtsev Mountains |
description |
Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 123 (2018): 7824-7849, doi:10.1029/2017JB015346. We construct a new seismic model for central and West Antarctica by jointly inverting Rayleigh wave phase and group velocities along with P wave receiver functions. Ambient noise tomography exploiting data from more than 200 seismic stations deployed over the past 18 years is used to construct Rayleigh wave phase and group velocity dispersion maps. Comparison between the ambient noise phase velocity maps with those constructed using teleseismic earthquakes confirms the accuracy of both results. These maps, together with P receiver function waveforms, are used to construct a new 3‐D shear velocity (Vs) model for the crust and uppermost mantle using a Bayesian Monte Carlo algorithm. The new 3‐D seismic model shows the dichotomy of the tectonically active West Antarctica (WANT) and the stable and ancient East Antarctica (EANT). In WANT, the model exhibits a slow uppermost mantle along the Transantarctic Mountains (TAMs) front, interpreted as the thermal effect from Cenozoic rifting. Beneath the southern TAMs, the slow uppermost mantle extends horizontally beneath the traditionally recognized EANT, hypothesized to be associated with lithospheric delamination. Thin crust and lithosphere observed along the Amundsen Sea coast and extending into the interior suggest involvement of these areas in Cenozoic rifting. EANT, with its relatively thick and cold crust and lithosphere marked by high Vs, displays a slower Vs anomaly beneath the Gamburtsev Subglacial Mountains in the uppermost mantle, which we hypothesize may be the signature of a compositionally anomalous body, perhaps remnant from a continental collision. National Science Foundation Grant Numbers: PLR‐1142518, PLR‐1246712, PLR 1246151, PLR‐1246416, PLR‐1744883, ... |
format |
Article in Journal/Newspaper |
author |
Shen, Weisen Wiens, Douglas A. Anandakrishnan, Sridhar Aster, Richard C. Gerstoft, Peter Bromirski, Peter D. Hansen, Samantha E. Dalziel, Ian W. D. Heeszel, David S. Huerta, Audrey D. Nyblade, Andrew A. Stephen, Ralph A. Wilson, Terry J. Winberry, J. Paul |
author_facet |
Shen, Weisen Wiens, Douglas A. Anandakrishnan, Sridhar Aster, Richard C. Gerstoft, Peter Bromirski, Peter D. Hansen, Samantha E. Dalziel, Ian W. D. Heeszel, David S. Huerta, Audrey D. Nyblade, Andrew A. Stephen, Ralph A. Wilson, Terry J. Winberry, J. Paul |
author_sort |
Shen, Weisen |
title |
The crust and upper mantle structure of central and West Antarctica from Bayesian inversion of Rayleigh Wave and receiver functions |
title_short |
The crust and upper mantle structure of central and West Antarctica from Bayesian inversion of Rayleigh Wave and receiver functions |
title_full |
The crust and upper mantle structure of central and West Antarctica from Bayesian inversion of Rayleigh Wave and receiver functions |
title_fullStr |
The crust and upper mantle structure of central and West Antarctica from Bayesian inversion of Rayleigh Wave and receiver functions |
title_full_unstemmed |
The crust and upper mantle structure of central and West Antarctica from Bayesian inversion of Rayleigh Wave and receiver functions |
title_sort |
crust and upper mantle structure of central and west antarctica from bayesian inversion of rayleigh wave and receiver functions |
publisher |
John Wiley & Sons |
publishDate |
2018 |
url |
https://hdl.handle.net/1912/10702 |
long_lat |
ENVELOPE(76.000,76.000,-80.500,-80.500) |
geographic |
Amundsen Sea East Antarctica Gamburtsev Subglacial Mountains Transantarctic Mountains West Antarctica |
geographic_facet |
Amundsen Sea East Antarctica Gamburtsev Subglacial Mountains Transantarctic Mountains West Antarctica |
genre |
Amundsen Sea Antarc* Antarctica East Antarctica West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctica East Antarctica West Antarctica |
op_source |
Journal of Geophysical Research: Solid Earth 123 (2018): 7824-7849 doi:10.1029/2017JB015346 |
op_relation |
https://doi.org/10.1029/2017JB015346 Journal of Geophysical Research: Solid Earth 123 (2018): 7824-7849 https://hdl.handle.net/1912/10702 doi:10.1029/2017JB015346 |
op_doi |
https://doi.org/10.1029/2017JB015346 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
123 |
container_issue |
9 |
container_start_page |
7824 |
op_container_end_page |
7849 |
_version_ |
1766378367609733120 |