Improved ambient noise correlation functions using Welch's method

Here, we evaluate the improvement in noise correlation functions (NCFs) gained by dividing ambient seismic records into shorter, overlapping time windows before correlation and stacking (Welch's method). We compare waveform convergence of short duration NCF stacks (e.g. 2, 5, 15 and 50 d stacks...

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Tipo de recurso:
Fecha de publicación:
2011
Institución:
Universidad del Rosario
Repositorio:
Repositorio EdocUR - U. Rosario
Idioma:
eng
OAI Identifier:
oai:repository.urosario.edu.co:10336/27856
Acceso en línea:
https://doi.org/10.1111/j.1365-246X.2011.05263.x
https://repository.urosario.edu.co/handle/10336/27856
Palabra clave:
Time?series analysis
Interferometry
Surface waves and free oscillations
Seismic tomography
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id EDOCUR2_eec8c2176ccce9dec63f6a81eb341756
oai_identifier_str oai:repository.urosario.edu.co:10336/27856
network_acronym_str EDOCUR2
network_name_str Repositorio EdocUR - U. Rosario
repository_id_str
spelling 8cd6c360-95bd-4c83-ba37-1b3baa88b5db-1942b051c-c50c-4403-a02b-548cd486e842-194534115-12020-08-19T14:44:16Z2020-08-19T14:44:16Z2011-11-17Here, we evaluate the improvement in noise correlation functions (NCFs) gained by dividing ambient seismic records into shorter, overlapping time windows before correlation and stacking (Welch's method). We compare waveform convergence of short duration NCF stacks (e.g. 2, 5, 15 and 50 d stacks) towards the long?term (365 d) NCF stack. We observe short duration NCF improvement when applying Welch's method for non–pre?processed and running normalized time?series and short duration NCF degradation when applied to a ‘one?bit’ normalized time?series. Surprisingly, non–pre?processed time?series provides the quickest convergence to a robust (year?long) NCF. Because of the simplicity of Welch's method, the improved NCF convergence and a minimal increase in computation, we recommend applying Welch's method for future ambient seismic field analyses. Using this approach will likely improve future NCF analyses, particularly for studies with limited duration recordings, high levels of intermittent local or site noise and studies attempting to evaluate temporal variations in subsurface structure.application/pdfhttps://doi.org/10.1111/j.1365-246X.2011.05263.xISSN: 0956-540XEISSN: 1365-246Xhttps://repository.urosario.edu.co/handle/10336/27856engJohn Wiley & Sons523No. 2513Geophysical Journal InternationalVol. 188Geophysical Journal International, ISSN: 0956-540X;EISSN: 1365-246X, Vol.188, No.2 (February 2012); pp. 513-523https://onlinelibrary.wiley.com/doi/epdf/10.1111/j.1365-246X.2011.05263.xRestringido (Acceso a grupos específicos)http://purl.org/coar/access_right/c_16ecGeophysical Journal Internationalinstname:Universidad del Rosarioreponame:Repositorio Institucional EdocURTime?series analysisInterferometrySurface waves and free oscillationsSeismic tomographyImproved ambient noise correlation functions using Welch's methodFunciones de correlación de ruido ambiental mejoradas mediante el método de WelcharticleArtículohttp://purl.org/coar/version/c_970fb48d4fbd8a85http://purl.org/coar/resource_type/c_6501Seats, Kevin J.Lawrence, Jesse F.Prieto, German A.10336/27856oai:repository.urosario.edu.co:10336/278562021-06-03 00:51:04.901https://repository.urosario.edu.coRepositorio institucional EdocURedocur@urosario.edu.co
dc.title.spa.fl_str_mv Improved ambient noise correlation functions using Welch's method
dc.title.TranslatedTitle.spa.fl_str_mv Funciones de correlación de ruido ambiental mejoradas mediante el método de Welch
title Improved ambient noise correlation functions using Welch's method
spellingShingle Improved ambient noise correlation functions using Welch's method
Time?series analysis
Interferometry
Surface waves and free oscillations
Seismic tomography
title_short Improved ambient noise correlation functions using Welch's method
title_full Improved ambient noise correlation functions using Welch's method
title_fullStr Improved ambient noise correlation functions using Welch's method
title_full_unstemmed Improved ambient noise correlation functions using Welch's method
title_sort Improved ambient noise correlation functions using Welch's method
dc.subject.keyword.spa.fl_str_mv Time?series analysis
Interferometry
Surface waves and free oscillations
Seismic tomography
topic Time?series analysis
Interferometry
Surface waves and free oscillations
Seismic tomography
description Here, we evaluate the improvement in noise correlation functions (NCFs) gained by dividing ambient seismic records into shorter, overlapping time windows before correlation and stacking (Welch's method). We compare waveform convergence of short duration NCF stacks (e.g. 2, 5, 15 and 50 d stacks) towards the long?term (365 d) NCF stack. We observe short duration NCF improvement when applying Welch's method for non–pre?processed and running normalized time?series and short duration NCF degradation when applied to a ‘one?bit’ normalized time?series. Surprisingly, non–pre?processed time?series provides the quickest convergence to a robust (year?long) NCF. Because of the simplicity of Welch's method, the improved NCF convergence and a minimal increase in computation, we recommend applying Welch's method for future ambient seismic field analyses. Using this approach will likely improve future NCF analyses, particularly for studies with limited duration recordings, high levels of intermittent local or site noise and studies attempting to evaluate temporal variations in subsurface structure.
publishDate 2011
dc.date.created.spa.fl_str_mv 2011-11-17
dc.date.accessioned.none.fl_str_mv 2020-08-19T14:44:16Z
dc.date.available.none.fl_str_mv 2020-08-19T14:44:16Z
dc.type.eng.fl_str_mv article
dc.type.coarversion.fl_str_mv http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.coar.fl_str_mv http://purl.org/coar/resource_type/c_6501
dc.type.spa.spa.fl_str_mv Artículo
dc.identifier.doi.none.fl_str_mv https://doi.org/10.1111/j.1365-246X.2011.05263.x
dc.identifier.issn.none.fl_str_mv ISSN: 0956-540X
EISSN: 1365-246X
dc.identifier.uri.none.fl_str_mv https://repository.urosario.edu.co/handle/10336/27856
url https://doi.org/10.1111/j.1365-246X.2011.05263.x
https://repository.urosario.edu.co/handle/10336/27856
identifier_str_mv ISSN: 0956-540X
EISSN: 1365-246X
dc.language.iso.spa.fl_str_mv eng
language eng
dc.relation.citationEndPage.none.fl_str_mv 523
dc.relation.citationIssue.none.fl_str_mv No. 2
dc.relation.citationStartPage.none.fl_str_mv 513
dc.relation.citationTitle.none.fl_str_mv Geophysical Journal International
dc.relation.citationVolume.none.fl_str_mv Vol. 188
dc.relation.ispartof.spa.fl_str_mv Geophysical Journal International, ISSN: 0956-540X;EISSN: 1365-246X, Vol.188, No.2 (February 2012); pp. 513-523
dc.relation.uri.spa.fl_str_mv https://onlinelibrary.wiley.com/doi/epdf/10.1111/j.1365-246X.2011.05263.x
dc.rights.coar.fl_str_mv http://purl.org/coar/access_right/c_16ec
dc.rights.acceso.spa.fl_str_mv Restringido (Acceso a grupos específicos)
rights_invalid_str_mv Restringido (Acceso a grupos específicos)
http://purl.org/coar/access_right/c_16ec
dc.format.mimetype.none.fl_str_mv application/pdf
dc.publisher.spa.fl_str_mv John Wiley & Sons
dc.source.spa.fl_str_mv Geophysical Journal International
institution Universidad del Rosario
dc.source.instname.none.fl_str_mv instname:Universidad del Rosario
dc.source.reponame.none.fl_str_mv reponame:Repositorio Institucional EdocUR
repository.name.fl_str_mv Repositorio institucional EdocUR
repository.mail.fl_str_mv edocur@urosario.edu.co
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