Faulting process and coseismic stress change during the 30 January, 1973, Colima, Mexico interplate earthquake (Mw=7.6)

A large thrust earthquake (Mw=7.6) occurred on January 30, 1973, on the plate interface between the subducting Cocosplate and the continental North America plate, near the triple junction between the North America, Cocos and Rivera Plates.This event might be related to two sequences of subsequent la...

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Detalles Bibliográficos
Autores: Luis Quintanar, Miguel A. Santoyo, Takeshi Mikumo
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2006
País:México
Institución:Universidad Nacional Autónoma de México
Repositorio:Redalyc-UNAM
OAI Identifier:oai:redalyc.org:56845302
Acceso en línea:https://www.redalyc.org/articulo.oa?id=56845302
Access Level:acceso abierto
Palabra clave:Ciencias de la Tierra
Coseismic stress change
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spelling Faulting process and coseismic stress change during the 30 January, 1973, Colima, Mexico interplate earthquake (Mw=7.6)Luis QuintanarMiguel A. SantoyoTakeshi MikumoCiencias de la TierraCoseismic stress changeA large thrust earthquake (Mw=7.6) occurred on January 30, 1973, on the plate interface between the subducting Cocosplate and the continental North America plate, near the triple junction between the North America, Cocos and Rivera Plates.This event might be related to two sequences of subsequent large earthquakes that occurred around this region. Althoughseveral authors have analyzed the focal mechanism and depth of this earthquake, we analyzed its source characteristics andperformed a linear kinematic waveform inversion for the slip distribution over the fault plane. We find a shallow thrust mechanism(St=285°, Dip=16°, Ra=85°) consistent with the tectonic environment, with a depth of 16 km and a total moment release of2.98x1027 dyn-cm. The results show a slip distribution with two main patches, with a maximum dislocation of 199 cm and 173cm respectively. We calculated the coseismic stress change on and around the fault plane. This earthquake ruptured two mainasperities, one downdip and southwest and the other updip and northwest of the hypocenter, with stress change of –31 and -40bars respectively The surrounding zone of stress increase could have influenced the subsequent seismicity to a distance of up to120 km from the hypocenter.Universidad Nacional Autónoma de México2006info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdf0016-7169https://www.redalyc.org/articulo.oa?id=56845302Geofísica Internacional (México) Num.3 Vol.45reponame:Redalyc-UNAMinstname:Universidad Nacional Autónoma de Méxicoinstacron:UNAMenhttp://www.redalyc.org/revista.oa?id=568Geofísica Internacionalinfo:eu-repo/semantics/openAccessoai:redalyc.org:568453022025-09-03T18:07:44Z
dc.title.none.fl_str_mv Faulting process and coseismic stress change during the 30 January, 1973, Colima, Mexico interplate earthquake (Mw=7.6)
title Faulting process and coseismic stress change during the 30 January, 1973, Colima, Mexico interplate earthquake (Mw=7.6)
spellingShingle Faulting process and coseismic stress change during the 30 January, 1973, Colima, Mexico interplate earthquake (Mw=7.6)
Luis Quintanar
Ciencias de la Tierra
Coseismic stress change
title_short Faulting process and coseismic stress change during the 30 January, 1973, Colima, Mexico interplate earthquake (Mw=7.6)
title_full Faulting process and coseismic stress change during the 30 January, 1973, Colima, Mexico interplate earthquake (Mw=7.6)
title_fullStr Faulting process and coseismic stress change during the 30 January, 1973, Colima, Mexico interplate earthquake (Mw=7.6)
title_full_unstemmed Faulting process and coseismic stress change during the 30 January, 1973, Colima, Mexico interplate earthquake (Mw=7.6)
title_sort Faulting process and coseismic stress change during the 30 January, 1973, Colima, Mexico interplate earthquake (Mw=7.6)
dc.creator.none.fl_str_mv Luis Quintanar
Miguel A. Santoyo
Takeshi Mikumo
author Luis Quintanar
author_facet Luis Quintanar
Miguel A. Santoyo
Takeshi Mikumo
author_role author
author2 Miguel A. Santoyo
Takeshi Mikumo
author2_role author
author
dc.subject.none.fl_str_mv Ciencias de la Tierra
Coseismic stress change
topic Ciencias de la Tierra
Coseismic stress change
description A large thrust earthquake (Mw=7.6) occurred on January 30, 1973, on the plate interface between the subducting Cocosplate and the continental North America plate, near the triple junction between the North America, Cocos and Rivera Plates.This event might be related to two sequences of subsequent large earthquakes that occurred around this region. Althoughseveral authors have analyzed the focal mechanism and depth of this earthquake, we analyzed its source characteristics andperformed a linear kinematic waveform inversion for the slip distribution over the fault plane. We find a shallow thrust mechanism(St=285°, Dip=16°, Ra=85°) consistent with the tectonic environment, with a depth of 16 km and a total moment release of2.98x1027 dyn-cm. The results show a slip distribution with two main patches, with a maximum dislocation of 199 cm and 173cm respectively. We calculated the coseismic stress change on and around the fault plane. This earthquake ruptured two mainasperities, one downdip and southwest and the other updip and northwest of the hypocenter, with stress change of –31 and -40bars respectively The surrounding zone of stress increase could have influenced the subsequent seismicity to a distance of up to120 km from the hypocenter.
publishDate 2006
dc.date.none.fl_str_mv 2006
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/article
format article
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dc.identifier.none.fl_str_mv 0016-7169
https://www.redalyc.org/articulo.oa?id=56845302
identifier_str_mv 0016-7169
url https://www.redalyc.org/articulo.oa?id=56845302
dc.language.none.fl_str_mv en
language_invalid_str_mv en
dc.relation.none.fl_str_mv http://www.redalyc.org/revista.oa?id=568
dc.rights.none.fl_str_mv Geofísica Internacional
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Geofísica Internacional
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidad Nacional Autónoma de México
publisher.none.fl_str_mv Universidad Nacional Autónoma de México
dc.source.none.fl_str_mv Geofísica Internacional (México) Num.3 Vol.45
reponame:Redalyc-UNAM
instname:Universidad Nacional Autónoma de México
instacron:UNAM
instname_str Universidad Nacional Autónoma de México
instacron_str UNAM
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