A New Approach for the Automatic Detection of Shear-wave Splitting ...
This thesis introduces a new approach for the automatic detection of two crucially important shear wave splitting (SWS) parameters, fast wave polarization and delay time between split waves, from microearthquake seismograms. The method is based on the analyses of multiple time windows that include t...
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The University of North Carolina at Chapel Hill University Libraries
2008
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ftdatacite:10.17615/s7wz-5206 2024-03-31T07:53:31+00:00 A New Approach for the Automatic Detection of Shear-wave Splitting ... Zhao, Yang 2008 https://dx.doi.org/10.17615/s7wz-5206 https://cdr.lib.unc.edu/concern/dissertations/7s75dd500?locale=en en eng The University of North Carolina at Chapel Hill University Libraries In Copyright http://rightsstatements.org/vocab/InC/1.0/ Text article-journal Masters Thesis ScholarlyArticle 2008 ftdatacite https://doi.org/10.17615/s7wz-5206 2024-03-04T11:34:09Z This thesis introduces a new approach for the automatic detection of two crucially important shear wave splitting (SWS) parameters, fast wave polarization and delay time between split waves, from microearthquake seismograms. The method is based on the analyses of multiple time windows that include the shear wave arrivals. An automated SWS algorithm is performed for each specified window. Over the estimates of the two parameters (polarization and time delay) obtained from all windows, an unsupervised cluster analysis is applied to locate the region with the most stable estimate. The optimal region is that with the lowest variance. The mean value of the optimal cluster is regarded as the best estimate of polarization and time delay. The estimates are relatively easy to derive from large seismic datasets and show high reliability. We compare the results with manually estimated values of the SWS parameters from seismic data collected at The Geysers and Coso, CA, and Hengill, Iceland geothermal fields, and show ... Text Iceland DataCite Metadata Store (German National Library of Science and Technology) Hengill ENVELOPE(-21.306,-21.306,64.078,64.078) |
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DataCite Metadata Store (German National Library of Science and Technology) |
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ftdatacite |
language |
English |
description |
This thesis introduces a new approach for the automatic detection of two crucially important shear wave splitting (SWS) parameters, fast wave polarization and delay time between split waves, from microearthquake seismograms. The method is based on the analyses of multiple time windows that include the shear wave arrivals. An automated SWS algorithm is performed for each specified window. Over the estimates of the two parameters (polarization and time delay) obtained from all windows, an unsupervised cluster analysis is applied to locate the region with the most stable estimate. The optimal region is that with the lowest variance. The mean value of the optimal cluster is regarded as the best estimate of polarization and time delay. The estimates are relatively easy to derive from large seismic datasets and show high reliability. We compare the results with manually estimated values of the SWS parameters from seismic data collected at The Geysers and Coso, CA, and Hengill, Iceland geothermal fields, and show ... |
format |
Text |
author |
Zhao, Yang |
spellingShingle |
Zhao, Yang A New Approach for the Automatic Detection of Shear-wave Splitting ... |
author_facet |
Zhao, Yang |
author_sort |
Zhao, Yang |
title |
A New Approach for the Automatic Detection of Shear-wave Splitting ... |
title_short |
A New Approach for the Automatic Detection of Shear-wave Splitting ... |
title_full |
A New Approach for the Automatic Detection of Shear-wave Splitting ... |
title_fullStr |
A New Approach for the Automatic Detection of Shear-wave Splitting ... |
title_full_unstemmed |
A New Approach for the Automatic Detection of Shear-wave Splitting ... |
title_sort |
new approach for the automatic detection of shear-wave splitting ... |
publisher |
The University of North Carolina at Chapel Hill University Libraries |
publishDate |
2008 |
url |
https://dx.doi.org/10.17615/s7wz-5206 https://cdr.lib.unc.edu/concern/dissertations/7s75dd500?locale=en |
long_lat |
ENVELOPE(-21.306,-21.306,64.078,64.078) |
geographic |
Hengill |
geographic_facet |
Hengill |
genre |
Iceland |
genre_facet |
Iceland |
op_rights |
In Copyright http://rightsstatements.org/vocab/InC/1.0/ |
op_doi |
https://doi.org/10.17615/s7wz-5206 |
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1795033354606739456 |