The Crust and Upper Mantle Structure of Central and West Antarctica From Bayesian Inversion of Rayleigh Wave and Receiver Functions
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 Rayle...
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ftcwashingtonuni:oai:digitalcommons.cwu.edu:cotsfac-1094 2023-05-15T13:24:12+02:00 The Crust and Upper Mantle Structure of Central and West Antarctica From Bayesian Inversion of Rayleigh Wave and Receiver Functions Shen, Weisen Huerta, Audrey D. Winberry, J. Paul 2018-09-22T07:00:00Z application/pdf https://digitalcommons.cwu.edu/cotsfac/94 https://digitalcommons.cwu.edu/cgi/viewcontent.cgi?article=1094&context=cotsfac unknown ScholarWorks@CWU https://digitalcommons.cwu.edu/cotsfac/94 https://digitalcommons.cwu.edu/cgi/viewcontent.cgi?article=1094&context=cotsfac ©2018. American Geophysical Union. All Rights Reserved. All Faculty Scholarship for the College of the Sciences Seismology Crust and Uppermost Mantle Ambient Noise Tomography Antarctica Transantarctic Mountains Gamburtsev Mountains Geology Geophysics and Seismology text 2018 ftcwashingtonuni 2022-10-20T20:28:46Z 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. Text Amundsen Sea Antarc* Antarctica East Antarctica West Antarctica Central Washington University: ScholarWorks Amundsen Sea East Antarctica Gamburtsev Subglacial Mountains ENVELOPE(76.000,76.000,-80.500,-80.500) Transantarctic Mountains West Antarctica |
institution |
Open Polar |
collection |
Central Washington University: ScholarWorks |
op_collection_id |
ftcwashingtonuni |
language |
unknown |
topic |
Seismology Crust and Uppermost Mantle Ambient Noise Tomography Antarctica Transantarctic Mountains Gamburtsev Mountains Geology Geophysics and Seismology |
spellingShingle |
Seismology Crust and Uppermost Mantle Ambient Noise Tomography Antarctica Transantarctic Mountains Gamburtsev Mountains Geology Geophysics and Seismology Shen, Weisen Huerta, Audrey D. 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 Geology Geophysics and Seismology |
description |
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. |
format |
Text |
author |
Shen, Weisen Huerta, Audrey D. Winberry, J. Paul |
author_facet |
Shen, Weisen Huerta, Audrey D. 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 |
ScholarWorks@CWU |
publishDate |
2018 |
url |
https://digitalcommons.cwu.edu/cotsfac/94 https://digitalcommons.cwu.edu/cgi/viewcontent.cgi?article=1094&context=cotsfac |
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 |
All Faculty Scholarship for the College of the Sciences |
op_relation |
https://digitalcommons.cwu.edu/cotsfac/94 https://digitalcommons.cwu.edu/cgi/viewcontent.cgi?article=1094&context=cotsfac |
op_rights |
©2018. American Geophysical Union. All Rights Reserved. |
_version_ |
1766378055640547328 |