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...
- Autores:
- 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
- Rights
- License
- Restringido (Acceso a grupos específicos)
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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 |
_version_ |
1814167619207430144 |