CRUST AND UPPER MANTLE STRUCTURE OF WEST ANTARCTICA FROM A SPARSE SEISMIC ARRAY
The West Antarctic Rift System is poorly understood relative to the other major rift systems of the world because of the remoteness of Antarctica and because the West Antarctic Ice Sheet covers most of the rift. In this paper, the crust and upper mantle structures of the interior of the West Antarct...
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ftpennstate:OAI:PSUETD:ETD-1209 2023-05-15T13:58:45+02:00 CRUST AND UPPER MANTLE STRUCTURE OF WEST ANTARCTICA FROM A SPARSE SEISMIC ARRAY Cho, Tongjun Sridhar Anandakrishnan Charles J. Ammon Joseph L. Rose Bernhard R. Tittmann 2006-05-14 application/pdf http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-1209/index.html en eng Penn State WorldWide Copyright information available at source archive http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-1209/index.html Acoustics text 2006 ftpennstate 2011-09-13T07:46:32Z The West Antarctic Rift System is poorly understood relative to the other major rift systems of the world because of the remoteness of Antarctica and because the West Antarctic Ice Sheet covers most of the rift. In this paper, the crust and upper mantle structures of the interior of the West Antarctic Rift System were investigated using broadband seismic data from five widely spaced stations installed on the West Antarctic Ice Sheet. The crust and upper mantle seismic wave velocity structures were modeled using receiver functions and the inter-station surface wave dispersion curves. A new surface waveform extraction technique involving ambient seismic noise field correlation was applied for refining the surface wave dispersion measurements. A method for removing the ice layer reverberation effects on the receiver functions was designed and applied to retrieve the receiver function for crust and mantle-only structure. The mantle anisotropy of the rift region was measured by shear wave splitting analysis. The crust and uppermost shear wave velocity structure modeled in this study show that the crust is relatively thin, which we hypothesize is due to extension of the West Antarctic Rift System. In support of this hypothesis, I show that the measured anisotropy indicates that the fast axis direction is rift orthogonal. I model an approx. 100km thick anisotropic layer in the upper mantle, which may represent preservation of fabric from the major Late Cretaceous extension between East and West Antarctica. Text Antarc* Antarctic Antarctica Ice Sheet West Antarctica PennState: Electronic Theses and Dissertations (eTD) Antarctic West Antarctic Ice Sheet West Antarctica |
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PennState: Electronic Theses and Dissertations (eTD) |
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English |
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Acoustics |
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Acoustics Cho, Tongjun CRUST AND UPPER MANTLE STRUCTURE OF WEST ANTARCTICA FROM A SPARSE SEISMIC ARRAY |
topic_facet |
Acoustics |
description |
The West Antarctic Rift System is poorly understood relative to the other major rift systems of the world because of the remoteness of Antarctica and because the West Antarctic Ice Sheet covers most of the rift. In this paper, the crust and upper mantle structures of the interior of the West Antarctic Rift System were investigated using broadband seismic data from five widely spaced stations installed on the West Antarctic Ice Sheet. The crust and upper mantle seismic wave velocity structures were modeled using receiver functions and the inter-station surface wave dispersion curves. A new surface waveform extraction technique involving ambient seismic noise field correlation was applied for refining the surface wave dispersion measurements. A method for removing the ice layer reverberation effects on the receiver functions was designed and applied to retrieve the receiver function for crust and mantle-only structure. The mantle anisotropy of the rift region was measured by shear wave splitting analysis. The crust and uppermost shear wave velocity structure modeled in this study show that the crust is relatively thin, which we hypothesize is due to extension of the West Antarctic Rift System. In support of this hypothesis, I show that the measured anisotropy indicates that the fast axis direction is rift orthogonal. I model an approx. 100km thick anisotropic layer in the upper mantle, which may represent preservation of fabric from the major Late Cretaceous extension between East and West Antarctica. |
author2 |
Sridhar Anandakrishnan Charles J. Ammon Joseph L. Rose Bernhard R. Tittmann |
format |
Text |
author |
Cho, Tongjun |
author_facet |
Cho, Tongjun |
author_sort |
Cho, Tongjun |
title |
CRUST AND UPPER MANTLE STRUCTURE OF WEST ANTARCTICA FROM A SPARSE SEISMIC ARRAY |
title_short |
CRUST AND UPPER MANTLE STRUCTURE OF WEST ANTARCTICA FROM A SPARSE SEISMIC ARRAY |
title_full |
CRUST AND UPPER MANTLE STRUCTURE OF WEST ANTARCTICA FROM A SPARSE SEISMIC ARRAY |
title_fullStr |
CRUST AND UPPER MANTLE STRUCTURE OF WEST ANTARCTICA FROM A SPARSE SEISMIC ARRAY |
title_full_unstemmed |
CRUST AND UPPER MANTLE STRUCTURE OF WEST ANTARCTICA FROM A SPARSE SEISMIC ARRAY |
title_sort |
crust and upper mantle structure of west antarctica from a sparse seismic array |
publisher |
Penn State |
publishDate |
2006 |
url |
http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-1209/index.html |
geographic |
Antarctic West Antarctic Ice Sheet West Antarctica |
geographic_facet |
Antarctic West Antarctic Ice Sheet West Antarctica |
genre |
Antarc* Antarctic Antarctica Ice Sheet West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet West Antarctica |
op_source |
http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-1209/index.html |
op_rights |
WorldWide Copyright information available at source archive |
_version_ |
1766267088413917184 |