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Seismic anisotropy and mantle dynami...

Yang, Bin.

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Seismic anisotropy and mantle dynamics beneath the central and western United States.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Seismic anisotropy and mantle dynamics beneath the central and western United States./
Author:	Yang, Bin.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
Description:	151 p.
Notes:	Source: Dissertation Abstracts International, Volume: 78-05(E), Section: B.
Contained By:	Dissertation Abstracts International78-05B(E).
Subject:	Geophysics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10169177
ISBN:	9781369233926

Seismic anisotropy and mantle dynamics beneath the central and western United States.
Yang, Bin.

Seismic anisotropy and mantle dynamics beneath the central and western United States. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 151 p.

Source: Dissertation Abstracts International, Volume: 78-05(E), Section: B.

Thesis (Ph.D.)--Missouri University of Science and Technology, 2016.

Various tectonic features and the recent availability of high-quality broadband seismic data from the USArray and other seismic stations in the central and western United States (CWUS) provide a distinct opportunity to test different anisotropy-forming mechanisms. For the first part of the study, a total of 4138 pairs of well-defined shear wave splitting (SWS) parameters observed at 445 stations on the northern Great Plains show systematic spatial variations of anisotropic characteristics. Azimuthally invariant fast orientations subparallel to the absolute plate motion (APM) direction are observed at most of the stations on the Superior Craton and the southern Yavapai province, indicating that a single layer of anisotropy with a horizontal axis of symmetry is sufficient to explain the anisotropic structure. Based on the splitting measurements and previous results from seismic tomography and geodynamic modeling, we propose a model involving deflecting of asthenosphere flow by the bottom of the lithosphere and channeling flow by a zone of thinned lithosphere approximately along the northern boundary of the Yavapai province.

ISBN: 9781369233926Subjects--Topical Terms:

535228
Geophysics.

Seismic anisotropy and mantle dynamics beneath the central and western United States.
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245 1 0 $a Seismic anisotropy and mantle dynamics beneath the central and western United States.
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300 $a 151 p.
500 $a Source: Dissertation Abstracts International, Volume: 78-05(E), Section: B.
500 $a Advisers: Kelly H. Liu; Stephen S. Gao.
502 $a Thesis (Ph.D.)--Missouri University of Science and Technology, 2016.
520 $a Various tectonic features and the recent availability of high-quality broadband seismic data from the USArray and other seismic stations in the central and western United States (CWUS) provide a distinct opportunity to test different anisotropy-forming mechanisms. For the first part of the study, a total of 4138 pairs of well-defined shear wave splitting (SWS) parameters observed at 445 stations on the northern Great Plains show systematic spatial variations of anisotropic characteristics. Azimuthally invariant fast orientations subparallel to the absolute plate motion (APM) direction are observed at most of the stations on the Superior Craton and the southern Yavapai province, indicating that a single layer of anisotropy with a horizontal axis of symmetry is sufficient to explain the anisotropic structure. Based on the splitting measurements and previous results from seismic tomography and geodynamic modeling, we propose a model involving deflecting of asthenosphere flow by the bottom of the lithosphere and channeling flow by a zone of thinned lithosphere approximately along the northern boundary of the Yavapai province.
520 $a The second part of the study created an up-to-date SWS database for CWUS in the area of 125° W to 90° W, 26° N to 52° N to upgrade a previous database [Liu et al., 2014]. A total of 7452 pairs of high-quality measurements recorded by 1202 digital broadband seismic stations (both permanent and portable seismic networks) over the period of 1989-2014 is obtained. The current version includes 23448 pairs of well-defined splitting parameters in three phases, i.e. PKS, SKKS and SKS.
520 $a The dissertation is a combination of two journal papers published in 2014 and 2016, respectively.
590 $a School code: 0587.
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