Earthquake deformation in the northwestern Sierras Pampeanas of Argentina based on seismic waveform modelling

We investigate the seismic properties of modern crustal seismicity in the northwestern Sierras Pampeanas of the Andean retroarc region of Argentina. We modelled the complete regional seismic broadband waveforms of two crustal earthquakes that occurred in the Sierra de Velasco on 28 May 2002 and in t...

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Detalles Bibliográficos
Autores: Alvarado, Patricia Monica, Ramos, Victor Alberto
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2011
País:Argentina
Institución:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/68498
Acceso en línea:http://hdl.handle.net/11336/68498
Access Level:acceso abierto
Palabra clave:Andean Foreland
Crustal Earthquakes
Neotectonics
Seismic Hazard
Sierras Pampeanas
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
id AR_ffc033b02afee2d5c716dc571a4ebadd
oai_identifier_str oai:ri.conicet.gov.ar:11336/68498
network_acronym_str AR
network_name_str Argentina
repository_id_str
dc.title.none.fl_str_mv Earthquake deformation in the northwestern Sierras Pampeanas of Argentina based on seismic waveform modelling
title Earthquake deformation in the northwestern Sierras Pampeanas of Argentina based on seismic waveform modelling
spellingShingle Earthquake deformation in the northwestern Sierras Pampeanas of Argentina based on seismic waveform modelling
Alvarado, Patricia Monica
Andean Foreland
Crustal Earthquakes
Neotectonics
Seismic Hazard
Sierras Pampeanas
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
title_short Earthquake deformation in the northwestern Sierras Pampeanas of Argentina based on seismic waveform modelling
title_full Earthquake deformation in the northwestern Sierras Pampeanas of Argentina based on seismic waveform modelling
title_fullStr Earthquake deformation in the northwestern Sierras Pampeanas of Argentina based on seismic waveform modelling
title_full_unstemmed Earthquake deformation in the northwestern Sierras Pampeanas of Argentina based on seismic waveform modelling
title_sort Earthquake deformation in the northwestern Sierras Pampeanas of Argentina based on seismic waveform modelling
dc.creator.none.fl_str_mv Alvarado, Patricia Monica
Ramos, Victor Alberto
author Alvarado, Patricia Monica
author_facet Alvarado, Patricia Monica
Ramos, Victor Alberto
author_role author
author2 Ramos, Victor Alberto
author2_role author
dc.subject.none.fl_str_mv Andean Foreland
Crustal Earthquakes
Neotectonics
Seismic Hazard
Sierras Pampeanas
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
topic Andean Foreland
Crustal Earthquakes
Neotectonics
Seismic Hazard
Sierras Pampeanas
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
description We investigate the seismic properties of modern crustal seismicity in the northwestern Sierras Pampeanas of the Andean retroarc region of Argentina. We modelled the complete regional seismic broadband waveforms of two crustal earthquakes that occurred in the Sierra de Velasco on 28 May 2002 and in the Sierra de Ambato on 7 September 2004. For each earthquake we obtained the seismic moment tensor inversion (SMTI) and tested for its focal depth. Our results indicate mainly thrust focal mechanism solutions of magnitudes Mw 5.8 and 6.2 and focal depths of 10 and 8km, respectively. These results represent the larger seismicity and shallower focal depths in the last 100 years in this region. The SMTI 2002 and 2004 solutions are consistent with previous determinations for crustal seismicity in this region that also used seismic waveform modelling. Taken together, the results for crustal seismicity of magnitudes ≥5.0 in the last 30 years are consistent with an average P-axis horizontally oriented by an azimuth of 125° and T-axis orientation of azimuth 241° and plunge 58°. This modern crustal seismicity and the historical earthquakes are associated with two active reverse faulting systems of opposite vergences bounding the eastern margin of the Sierra de Velasco in the south and the southwestern margin of the Sierra de Ambato in the north. Strain recorded by focal mechanisms of the larger seismicity is very consistent over this region and is in good agreement with neotectonic activity during the last 11,000 years by Costa (2008) and Casa et al. (in press); this shows that the dominant deformation in this part of the Sierras Pampeanas is mainly controlled by contraction. Seismic deformation related to propagation of thrusts and long-lived shear zones of this area permit to disregard previous proposals, which suggested an extensional or sinistral regime for the geomorphic evolution since Pleistocene.
publishDate 2011
dc.date.none.fl_str_mv 2011-04
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/68498
Alvarado, Patricia Monica; Ramos, Victor Alberto; Earthquake deformation in the northwestern Sierras Pampeanas of Argentina based on seismic waveform modelling; Pergamon-Elsevier Science Ltd; Journal of Geodynamics; 51; 4; 4-2011; 205-218
0264-3707
CONICET Digital
CONICET
url http://hdl.handle.net/11336/68498
identifier_str_mv Alvarado, Patricia Monica; Ramos, Victor Alberto; Earthquake deformation in the northwestern Sierras Pampeanas of Argentina based on seismic waveform modelling; Pergamon-Elsevier Science Ltd; Journal of Geodynamics; 51; 4; 4-2011; 205-218
0264-3707
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jog.2010.08.002
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0264370710001158
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
publisher.none.fl_str_mv Pergamon-Elsevier Science Ltd
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1799195910007160832
spelling Earthquake deformation in the northwestern Sierras Pampeanas of Argentina based on seismic waveform modellingAlvarado, Patricia MonicaRamos, Victor AlbertoAndean ForelandCrustal EarthquakesNeotectonicsSeismic HazardSierras Pampeanashttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1We investigate the seismic properties of modern crustal seismicity in the northwestern Sierras Pampeanas of the Andean retroarc region of Argentina. We modelled the complete regional seismic broadband waveforms of two crustal earthquakes that occurred in the Sierra de Velasco on 28 May 2002 and in the Sierra de Ambato on 7 September 2004. For each earthquake we obtained the seismic moment tensor inversion (SMTI) and tested for its focal depth. Our results indicate mainly thrust focal mechanism solutions of magnitudes Mw 5.8 and 6.2 and focal depths of 10 and 8km, respectively. These results represent the larger seismicity and shallower focal depths in the last 100 years in this region. The SMTI 2002 and 2004 solutions are consistent with previous determinations for crustal seismicity in this region that also used seismic waveform modelling. Taken together, the results for crustal seismicity of magnitudes ≥5.0 in the last 30 years are consistent with an average P-axis horizontally oriented by an azimuth of 125° and T-axis orientation of azimuth 241° and plunge 58°. This modern crustal seismicity and the historical earthquakes are associated with two active reverse faulting systems of opposite vergences bounding the eastern margin of the Sierra de Velasco in the south and the southwestern margin of the Sierra de Ambato in the north. Strain recorded by focal mechanisms of the larger seismicity is very consistent over this region and is in good agreement with neotectonic activity during the last 11,000 years by Costa (2008) and Casa et al. (in press); this shows that the dominant deformation in this part of the Sierras Pampeanas is mainly controlled by contraction. Seismic deformation related to propagation of thrusts and long-lived shear zones of this area permit to disregard previous proposals, which suggested an extensional or sinistral regime for the geomorphic evolution since Pleistocene.Fil: Alvarado, Patricia Monica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Departamento de Geofísica y Astronomía; ArgentinaFil: Ramos, Victor Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Geología. Laboratorio de Tectónica Andina; ArgentinaPergamon-Elsevier Science Ltd2011-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/68498Alvarado, Patricia Monica; Ramos, Victor Alberto; Earthquake deformation in the northwestern Sierras Pampeanas of Argentina based on seismic waveform modelling; Pergamon-Elsevier Science Ltd; Journal of Geodynamics; 51; 4; 4-2011; 205-2180264-3707CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.jog.2010.08.002info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0264370710001158info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2024-05-08T14:08:00Zoai:ri.conicet.gov.ar:11336/68498instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982024-05-08 14:08:00.812CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
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