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Automation of shear-wave splitting p...

McMahon, Nicole D.

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Automation of shear-wave splitting parameter determination of local earthquakes at Yellowstone: Application as indicator of crustal stress and temporal variation.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Automation of shear-wave splitting parameter determination of local earthquakes at Yellowstone: Application as indicator of crustal stress and temporal variation./
Author:	McMahon, Nicole D.
Description:	71 p.
Notes:	Source: Masters Abstracts International, Volume: 49-05, page: .
Contained By:	Masters Abstracts International49-05.
Subject:	Geophysics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1492108
ISBN:	9781124628646

Automation of shear-wave splitting parameter determination of local earthquakes at Yellowstone: Application as indicator of crustal stress and temporal variation.
McMahon, Nicole D.

Automation of shear-wave splitting parameter determination of local earthquakes at Yellowstone: Application as indicator of crustal stress and temporal variation. - 71 p.

Source: Masters Abstracts International, Volume: 49-05, page: .

Thesis (M.S.)--Michigan Technological University, 2011.

Shear-wave splitting can be a useful technique for determining crustal stress fields in volcanic settings and temporal variations associated with activity. Splitting parameters were determined for a subset of local earthquakes recorded from 2000-2010 at Yellowstone. Analysis was automated using an unsupervised cluster analysis technique to determine optimum splitting parameters from 270 analysis windows for each event. Six stations clearly exhibit preferential fast polarization values sub-orthogonal to the direction of minimum horizontal compression. Yellowstone deformation results in a local crustal stress field differing from the regional field dominated by NE-SW extension, and fast directions reflect this difference rotating around the caldera maintaining perpendicularity to the rim. One station exhibits temporal variations concordant with identified periods of caldera subsidence and uplift. From splitting measurements, we calculated a crustal anisotropy of &sim;17-23% and crack density &sim;0.12-0.17 possibly resulting from stress-aligned fluid filled microcracks in the upper crust and an active hydrothermal system.

ISBN: 9781124628646Subjects--Topical Terms:

535228
Geophysics.

Automation of shear-wave splitting parameter determination of local earthquakes at Yellowstone: Application as indicator of crustal stress and temporal variation.
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035 $a (UMI)AAI1492108
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100 1 $a McMahon, Nicole D. $3 1676588
245 1 0 $a Automation of shear-wave splitting parameter determination of local earthquakes at Yellowstone: Application as indicator of crustal stress and temporal variation.
300 $a 71 p.
500 $a Source: Masters Abstracts International, Volume: 49-05, page: .
500 $a Adviser: Gregory P. Waite.
502 $a Thesis (M.S.)--Michigan Technological University, 2011.
520 $a Shear-wave splitting can be a useful technique for determining crustal stress fields in volcanic settings and temporal variations associated with activity. Splitting parameters were determined for a subset of local earthquakes recorded from 2000-2010 at Yellowstone. Analysis was automated using an unsupervised cluster analysis technique to determine optimum splitting parameters from 270 analysis windows for each event. Six stations clearly exhibit preferential fast polarization values sub-orthogonal to the direction of minimum horizontal compression. Yellowstone deformation results in a local crustal stress field differing from the regional field dominated by NE-SW extension, and fast directions reflect this difference rotating around the caldera maintaining perpendicularity to the rim. One station exhibits temporal variations concordant with identified periods of caldera subsidence and uplift. From splitting measurements, we calculated a crustal anisotropy of &sim;17-23% and crack density &sim;0.12-0.17 possibly resulting from stress-aligned fluid filled microcracks in the upper crust and an active hydrothermal system.
590 $a School code: 0129.
650 4 $a Geophysics. $3 535228
690 $a 0373
710 2 $a Michigan Technological University. $b Geological/Mining Engineering & Sciences. $3 1019568
773 0 $t Masters Abstracts International $g 49-05.
790 1 0 $a Waite, Gregory P., $e advisor
790 1 0 $a Carn, Simon A. $e committee member
790 1 0 $a Huentemeyer, Petra $e committee member
790 $a 0129
791 $a M.S.
792 $a 2011
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1492108