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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.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Automation of shear-wave splitting parameter determination of local earthquakes at Yellowstone: Application as indicator of crustal stress and temporal variation./
作者:	McMahon, Nicole D.
面頁冊數:	71 p.
附註:	Source: Masters Abstracts International, Volume: 49-05, page: .
Contained By:	Masters Abstracts International49-05.
標題:	Geophysics. -
電子資源:	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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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.
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