Quantifying seismic source parameter uncertainties

We use data from a small aperture array in southern California to quantify variations in source parameter estimates at closely spaced stations (distances ranging from ?7 to 350 m) to provide constraints on parameter uncertainties. Many studies do not consider uncertainties in these estimates even th...

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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:10336/26831
Acceso en línea:
https://doi.org/10.1785/0120100166
https://repository.urosario.edu.co/handle/10336/26831
Palabra clave:
Algorithms
Body waves
California
Earthquakes
Elastic waves
Fault zones
Faults
Green function
Magnitude
P-waves
San Jacinto
Rights
License
Restringido (Acceso a grupos específicos)
id EDOCUR2_7648d6b346f14000bbf6cb021aadb1fa
oai_identifier_str oai:repository.urosario.edu.co:10336/26831
network_acronym_str EDOCUR2
network_name_str Repositorio EdocUR - U. Rosario
repository_id_str
spelling 20552f1f-4005-4b83-bd07-8c4780671c68-177c790ed-02ae-44ed-ba19-cd7422a58521-192527665-562f-4ccd-aa5c-19c67e0825ad-139f2a157-2c33-410e-870a-ef94610cd1d0-12020-08-19T14:40:20Z2020-08-19T14:40:20Z2011-04-01We use data from a small aperture array in southern California to quantify variations in source parameter estimates at closely spaced stations (distances ranging from ?7 to 350 m) to provide constraints on parameter uncertainties. Many studies do not consider uncertainties in these estimates even though they can be significant and have important implications for studies of earthquake source physics. Here, we estimate seismic source parameters in the frequency domain using empirical Green’s function (EGF) methods to remove effects of the travel paths between earthquakes and their recording stations. We examine uncertainties in our estimates by quantifying the resulting distributions over all stations in the array. For coseismic stress drop estimates, we find that minimum uncertainties of ?30% of the estimate can be expected. To test the robustness of our results, we explore variations of the dataset using different groupings of stations, different source regions, and different EGF earthquakes. Although these differences affect our absolute estimates of stress drop, they do not greatly influence the spread in our resulting estimates. These sensitivity tests show that station selection is not the primary contribution to the uncertainties in our parameter estimates for single stations. We conclude that establishing reliable methods of estimating uncertainties in source parameter estimates (including corner frequencies, source durations, and coseismic static stress drops) is essential, particularly when the results are used in the comparisons among different studies over a range of earthquake magnitudes and locations.application/pdfhttps://doi.org/10.1785/0120100166ISSN: 0037-1106EISSN: 1943-3573https://repository.urosario.edu.co/handle/10336/26831engSeismological Society of America543No. 2535Bulletin of the Seismological Society of AmericaVol. 101Bulletin of the Seismological Society of America, ISSN: 0037-1106;EISSN: 1943-3573, Vol.101, No.2 (April 2011); pp. 535-543https://pubs.geoscienceworld.org/ssa/bssa/article-abstract/101/2/535/349427/Quantifying-Seismic-Source-Parameter?redirectedFrom=PDFRestringido (Acceso a grupos específicos)http://purl.org/coar/access_right/c_16ecBulletin of the Seismological Society of Americainstname:Universidad del Rosarioreponame:Repositorio Institucional EdocURAlgorithmsBody wavesCaliforniaEarthquakesElastic wavesFault zonesFaultsGreen functionMagnitudeP-wavesSan JacintoQuantifying seismic source parameter uncertaintiesCuantificar las incertidumbres de los parámetros de la fuente sísmicaarticleArtículohttp://purl.org/coar/version/c_970fb48d4fbd8a85http://purl.org/coar/resource_type/c_6501Kane, Deborah L.Prieto, German A.Vernon, Frank L.Shearer, Peter M.10336/26831oai:repository.urosario.edu.co:10336/268312021-06-03 00:50:00.441https://repository.urosario.edu.coRepositorio institucional EdocURedocur@urosario.edu.co
dc.title.spa.fl_str_mv Quantifying seismic source parameter uncertainties
dc.title.TranslatedTitle.spa.fl_str_mv Cuantificar las incertidumbres de los parámetros de la fuente sísmica
title Quantifying seismic source parameter uncertainties
spellingShingle Quantifying seismic source parameter uncertainties
Algorithms
Body waves
California
Earthquakes
Elastic waves
Fault zones
Faults
Green function
Magnitude
P-waves
San Jacinto
title_short Quantifying seismic source parameter uncertainties
title_full Quantifying seismic source parameter uncertainties
title_fullStr Quantifying seismic source parameter uncertainties
title_full_unstemmed Quantifying seismic source parameter uncertainties
title_sort Quantifying seismic source parameter uncertainties
dc.subject.keyword.spa.fl_str_mv Algorithms
Body waves
California
Earthquakes
Elastic waves
Fault zones
Faults
Green function
Magnitude
P-waves
San Jacinto
topic Algorithms
Body waves
California
Earthquakes
Elastic waves
Fault zones
Faults
Green function
Magnitude
P-waves
San Jacinto
description We use data from a small aperture array in southern California to quantify variations in source parameter estimates at closely spaced stations (distances ranging from ?7 to 350 m) to provide constraints on parameter uncertainties. Many studies do not consider uncertainties in these estimates even though they can be significant and have important implications for studies of earthquake source physics. Here, we estimate seismic source parameters in the frequency domain using empirical Green’s function (EGF) methods to remove effects of the travel paths between earthquakes and their recording stations. We examine uncertainties in our estimates by quantifying the resulting distributions over all stations in the array. For coseismic stress drop estimates, we find that minimum uncertainties of ?30% of the estimate can be expected. To test the robustness of our results, we explore variations of the dataset using different groupings of stations, different source regions, and different EGF earthquakes. Although these differences affect our absolute estimates of stress drop, they do not greatly influence the spread in our resulting estimates. These sensitivity tests show that station selection is not the primary contribution to the uncertainties in our parameter estimates for single stations. We conclude that establishing reliable methods of estimating uncertainties in source parameter estimates (including corner frequencies, source durations, and coseismic static stress drops) is essential, particularly when the results are used in the comparisons among different studies over a range of earthquake magnitudes and locations.
publishDate 2011
dc.date.created.spa.fl_str_mv 2011-04-01
dc.date.accessioned.none.fl_str_mv 2020-08-19T14:40:20Z
dc.date.available.none.fl_str_mv 2020-08-19T14:40:20Z
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/10.1785/0120100166
dc.identifier.issn.none.fl_str_mv ISSN: 0037-1106
EISSN: 1943-3573
dc.identifier.uri.none.fl_str_mv https://repository.urosario.edu.co/handle/10336/26831
url https://doi.org/10.1785/0120100166
https://repository.urosario.edu.co/handle/10336/26831
identifier_str_mv ISSN: 0037-1106
EISSN: 1943-3573
dc.language.iso.spa.fl_str_mv eng
language eng
dc.relation.citationEndPage.none.fl_str_mv 543
dc.relation.citationIssue.none.fl_str_mv No. 2
dc.relation.citationStartPage.none.fl_str_mv 535
dc.relation.citationTitle.none.fl_str_mv Bulletin of the Seismological Society of America
dc.relation.citationVolume.none.fl_str_mv Vol. 101
dc.relation.ispartof.spa.fl_str_mv Bulletin of the Seismological Society of America, ISSN: 0037-1106;EISSN: 1943-3573, Vol.101, No.2 (April 2011); pp. 535-543
dc.relation.uri.spa.fl_str_mv https://pubs.geoscienceworld.org/ssa/bssa/article-abstract/101/2/535/349427/Quantifying-Seismic-Source-Parameter?redirectedFrom=PDF
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 Seismological Society of America
dc.source.spa.fl_str_mv Bulletin of the Seismological Society of America
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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