New evidences of rupture of crust and mantle in the subducted Nazca plate at intermediate-depth

Between 33°-36°S, the Nazca plate subducts below South American plate with an angle of ~30°, and it is seismically active until ~200-280km depth. At 33.5°S, the seismicity decreases drastically at 120km depth, just below the volcanic arc. In this paper, we studied a pair of associated earthquakes lo...

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Autores: Spagnotto, Silvana Liz, Triep, Enrique Gaudencio, Giambiagi, Laura Beatriz, Nacif Suvire, Silvina Valeria, Alvarez Pontoriero, Orlando
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2015
País:Argentina
Institución:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/37903
Acceso en línea:http://hdl.handle.net/11336/37903
Access Level:acceso abierto
Palabra clave:Coulomb Static Stress
Intermediate-Depth Seismicity
Outer-Rise Faults
Subducted Nazca Plate
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spelling New evidences of rupture of crust and mantle in the subducted Nazca plate at intermediate-depthSpagnotto, Silvana LizTriep, Enrique GaudencioGiambiagi, Laura BeatrizNacif Suvire, Silvina ValeriaAlvarez Pontoriero, OrlandoCoulomb Static StressIntermediate-Depth SeismicityOuter-Rise FaultsSubducted Nazca PlateBetween 33°-36°S, the Nazca plate subducts below South American plate with an angle of ~30°, and it is seismically active until ~200-280km depth. At 33.5°S, the seismicity decreases drastically at 120km depth, just below the volcanic arc. In this paper, we studied a pair of associated earthquakes located in the area where the frequency of seismicity changes. The hypocenters of the Mw=6.4, June 16th, 2000 and Mw=5.7 January 7th, 2003 earthquakes were found nearby, adjacent to the oceanic Moho, closely associated with each other. The slip on the plane of the 2000 event produced Coulomb stress changes on the fault plane of 2003, both westward dipping, with a variation from ~1bar near the hypocenter of the latter to ~0.1bars in the deepest part of the plane. The two earthquakes combined process describes a normal focal mechanism, which cuts through the crust and breaks the mantle, reaching depths of ~40km below the Moho.The composed fault plane of the 2000 and 2003 events corresponds to a west-dipping normal fault with strike and dip consistent with those of the outer ridge faults. Thus, these events could be related to a preexisting fault originated in that environment reactivated at depth.The slip on the composed fault plane is consistent with the bending produced by the slab pull. Dehydration could be associated to these events.Fil: Spagnotto, Silvana Liz. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de San Luis; ArgentinaFil: Triep, Enrique Gaudencio. Universidad Nacional de San Juan; ArgentinaFil: Giambiagi, Laura Beatriz. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto Geofísico Sismológico Volponi; ArgentinaFil: Nacif Suvire, Silvina Valeria. Universidad Nacional de San Juan; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Alvarez Pontoriero, Orlando. Universidad Nacional de San Juan; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaPergamon-Elsevier Science Ltd2015-03info: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/11336/37903Spagnotto, Silvana Liz; Triep, Enrique Gaudencio; Giambiagi, Laura Beatriz; Nacif Suvire, Silvina Valeria; Alvarez Pontoriero, Orlando; New evidences of rupture of crust and mantle in the subducted Nazca plate at intermediate-depth; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 58; 3-2015; 141-1470895-9811CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981114001679info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2014.12.002info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2024-05-08T14:14:59Zoai:ri.conicet.gov.ar:11336/37903instacron: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 14:14:59.984CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv New evidences of rupture of crust and mantle in the subducted Nazca plate at intermediate-depth
title New evidences of rupture of crust and mantle in the subducted Nazca plate at intermediate-depth
spellingShingle New evidences of rupture of crust and mantle in the subducted Nazca plate at intermediate-depth
Spagnotto, Silvana Liz
Coulomb Static Stress
Intermediate-Depth Seismicity
Outer-Rise Faults
Subducted Nazca Plate
title_short New evidences of rupture of crust and mantle in the subducted Nazca plate at intermediate-depth
title_full New evidences of rupture of crust and mantle in the subducted Nazca plate at intermediate-depth
title_fullStr New evidences of rupture of crust and mantle in the subducted Nazca plate at intermediate-depth
title_full_unstemmed New evidences of rupture of crust and mantle in the subducted Nazca plate at intermediate-depth
title_sort New evidences of rupture of crust and mantle in the subducted Nazca plate at intermediate-depth
dc.creator.none.fl_str_mv Spagnotto, Silvana Liz
Triep, Enrique Gaudencio
Giambiagi, Laura Beatriz
Nacif Suvire, Silvina Valeria
Alvarez Pontoriero, Orlando
author Spagnotto, Silvana Liz
author_facet Spagnotto, Silvana Liz
Triep, Enrique Gaudencio
Giambiagi, Laura Beatriz
Nacif Suvire, Silvina Valeria
Alvarez Pontoriero, Orlando
author_role author
author2 Triep, Enrique Gaudencio
Giambiagi, Laura Beatriz
Nacif Suvire, Silvina Valeria
Alvarez Pontoriero, Orlando
author2_role author
author
author
author
dc.subject.none.fl_str_mv Coulomb Static Stress
Intermediate-Depth Seismicity
Outer-Rise Faults
Subducted Nazca Plate
topic Coulomb Static Stress
Intermediate-Depth Seismicity
Outer-Rise Faults
Subducted Nazca Plate
description Between 33°-36°S, the Nazca plate subducts below South American plate with an angle of ~30°, and it is seismically active until ~200-280km depth. At 33.5°S, the seismicity decreases drastically at 120km depth, just below the volcanic arc. In this paper, we studied a pair of associated earthquakes located in the area where the frequency of seismicity changes. The hypocenters of the Mw=6.4, June 16th, 2000 and Mw=5.7 January 7th, 2003 earthquakes were found nearby, adjacent to the oceanic Moho, closely associated with each other. The slip on the plane of the 2000 event produced Coulomb stress changes on the fault plane of 2003, both westward dipping, with a variation from ~1bar near the hypocenter of the latter to ~0.1bars in the deepest part of the plane. The two earthquakes combined process describes a normal focal mechanism, which cuts through the crust and breaks the mantle, reaching depths of ~40km below the Moho.The composed fault plane of the 2000 and 2003 events corresponds to a west-dipping normal fault with strike and dip consistent with those of the outer ridge faults. Thus, these events could be related to a preexisting fault originated in that environment reactivated at depth.The slip on the composed fault plane is consistent with the bending produced by the slab pull. Dehydration could be associated to these events.
publishDate 2015
dc.date.none.fl_str_mv 2015-03
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/11336/37903
Spagnotto, Silvana Liz; Triep, Enrique Gaudencio; Giambiagi, Laura Beatriz; Nacif Suvire, Silvina Valeria; Alvarez Pontoriero, Orlando; New evidences of rupture of crust and mantle in the subducted Nazca plate at intermediate-depth; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 58; 3-2015; 141-147
0895-9811
CONICET Digital
CONICET
url http://hdl.handle.net/11336/37903
identifier_str_mv Spagnotto, Silvana Liz; Triep, Enrique Gaudencio; Giambiagi, Laura Beatriz; Nacif Suvire, Silvina Valeria; Alvarez Pontoriero, Orlando; New evidences of rupture of crust and mantle in the subducted Nazca plate at intermediate-depth; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 58; 3-2015; 141-147
0895-9811
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0895981114001679
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsames.2014.12.002
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
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score 15,811543

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