Stress transfere and statistical analysis of 2012 Ahar-Varzeghan siesmic sequence, Northwestern Iran

[EN] In 11 of August 2012, two destructive earthquakes with Mw= 6.4 and 6.2 occurred between cities Ahar and Varzeghan (Northwest Iran). They had a close epicentral distance of 6 Km and also had a short time lag of 11 minutes. Following that, a high-rate of aftershock activity began where during the...

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Detalhes bibliográficos
Autores: Yazdi, Pouye, Gaspar Escribano, Jorge, Santoyo, Miguel Angel
Formato: capítulo de livro
Fecha de publicación:2017
País:España
Recursos:Universitat Politècnica de València (UPV)
Repositorio:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
Idioma:inglés
OAI Identifier:oai:riunet.upv.es:10251/100651
Acesso em linha:https://riunet.upv.es/handle/10251/100651
Access Level:acceso abierto
Palavra-chave:Statistical Seismology
ETAS
Coulomb Failure stress
Irán
Sismología estadística
Transferencia de esfuerzos de Coulomb
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spelling Stress transfere and statistical analysis of 2012 Ahar-Varzeghan siesmic sequence, Northwestern IranTransferencia de esfuerzos y análisis estadístico de la serie sísmica de Ahar-Varzehan (Noroeste de Irán) de 2012Yazdi, PouyeGaspar Escribano, JorgeSantoyo, Miguel AngelStatistical SeismologyETASCoulomb Failure stressIránSismología estadísticaTransferencia de esfuerzos de Coulomb[EN] In 11 of August 2012, two destructive earthquakes with Mw= 6.4 and 6.2 occurred between cities Ahar and Varzeghan (Northwest Iran). They had a close epicentral distance of 6 Km and also had a short time lag of 11 minutes. Following that, a high-rate of aftershock activity began where during the first month more than 2000 events (M≥0.7) affected several villages in the area. The seismic released energy induced significant damage and losses in an extensive zone. Right after the seismic doublet occurrence, a surface rupture with a primarily east-west orientation was observed. The idea of having an almost vertically dipped fault plane for the first shock is more consistent with the trace of the upper edge on the surface and the focal mechanism solutions which propose a steady dipping EW. Previous studies propose different geometries for the generating faults of the second earthquake. In this study, we associate the surface rupture with the first mainshock and both nodal plane explaining the relationship between the two main seismic events are discussed after Coulomb failure stress calculation due to the first shock. Then the stress transfer because of the doublet is analyzed in order to determine its consistency with the statistical modeling prediction for the aftershock population and spatial distribution. For statistical modeling a temporal version of Epidemic Type Aftershock Sequence (ETAS) is applied on one-year seismicity including events with minimum magnitude of 2.5.[ES] Dos terremotos destructivos, de magnitudes Mw=6.4 y 6.2, ocurrieron el 11 de agosto de 2012 entre las ciudades iraníes de Ahar y Varzeghan. Los epicentros se situaron cerca entre sí, a una distancia de 6 km, y con un intervalo temporal de 11 muinutos. La serie de réplicas subsiguiente se desarrollo con una tasa alta, de más de 2000 eventos en el primer mes (M≥0.7). El movimiento sísmico produjo considerable daño y pérdidas en una zona extensa. El primer evento causó una ruptura semi-vertical, consistente con uno de los planos nodales del mecanismo focal y con una ruptura en superficie con orientación este-oeste. En cuanta a la falla causante del segundo evento principal, existen varias hipótesis. En este trabajo se realiza un modelo de transferencia de esfuerzos estáticos de Coulomb debidos al primer evento para delimitar las zonas cargadas de esfuerzos en las que es más plausible que se haya desencadenado el segundo evento principal. Seguidamente, se considera el cambio de esfuerzos producido por los dos eventos a fin de determinar cuales son las zonas cargadas positiva y negativamente de esfuerzos. De forma complementaria, se desarrolla un modelado estadístico de la población de réplicas y su distribución espacial. Se usa la versión temporal del modelo ETAS (Epidemic Type Aftreshock Sequence) para identificar los eventos que son réplicas y se analiza su distribución espacial en relación a la distribución de los incrementos / decrementos de esfuerzos de Coulomb.Editorial Universitat Politècnica de ValènciaRepositorio Institucional de la Universitat Politècnica de València Riunet20172017-10-23book parthttp://purl.org/coar/resource_type/c_3248VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/bookPartapplication/pdfhttps://riunet.upv.es/handle/10251/100651reponame:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valénciainstname:Universitat Politècnica de València (UPV)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Reconocimiento - No comercial - Sin obra derivada (by-nc-nd) http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:riunet.upv.es:10251/1006512026-06-13T07:49:27Z
dc.title.none.fl_str_mv Stress transfere and statistical analysis of 2012 Ahar-Varzeghan siesmic sequence, Northwestern Iran
Transferencia de esfuerzos y análisis estadístico de la serie sísmica de Ahar-Varzehan (Noroeste de Irán) de 2012
title Stress transfere and statistical analysis of 2012 Ahar-Varzeghan siesmic sequence, Northwestern Iran
spellingShingle Stress transfere and statistical analysis of 2012 Ahar-Varzeghan siesmic sequence, Northwestern Iran
Yazdi, Pouye
Statistical Seismology
ETAS
Coulomb Failure stress
Irán
Sismología estadística
Transferencia de esfuerzos de Coulomb
title_short Stress transfere and statistical analysis of 2012 Ahar-Varzeghan siesmic sequence, Northwestern Iran
title_full Stress transfere and statistical analysis of 2012 Ahar-Varzeghan siesmic sequence, Northwestern Iran
title_fullStr Stress transfere and statistical analysis of 2012 Ahar-Varzeghan siesmic sequence, Northwestern Iran
title_full_unstemmed Stress transfere and statistical analysis of 2012 Ahar-Varzeghan siesmic sequence, Northwestern Iran
title_sort Stress transfere and statistical analysis of 2012 Ahar-Varzeghan siesmic sequence, Northwestern Iran
dc.creator.none.fl_str_mv Yazdi, Pouye
Gaspar Escribano, Jorge
Santoyo, Miguel Angel
author Yazdi, Pouye
author_facet Yazdi, Pouye
Gaspar Escribano, Jorge
Santoyo, Miguel Angel
author_role author
author2 Gaspar Escribano, Jorge
Santoyo, Miguel Angel
author2_role author
author
dc.contributor.none.fl_str_mv Repositorio Institucional de la Universitat Politècnica de València Riunet
dc.subject.none.fl_str_mv Statistical Seismology
ETAS
Coulomb Failure stress
Irán
Sismología estadística
Transferencia de esfuerzos de Coulomb
topic Statistical Seismology
ETAS
Coulomb Failure stress
Irán
Sismología estadística
Transferencia de esfuerzos de Coulomb
description [EN] In 11 of August 2012, two destructive earthquakes with Mw= 6.4 and 6.2 occurred between cities Ahar and Varzeghan (Northwest Iran). They had a close epicentral distance of 6 Km and also had a short time lag of 11 minutes. Following that, a high-rate of aftershock activity began where during the first month more than 2000 events (M≥0.7) affected several villages in the area. The seismic released energy induced significant damage and losses in an extensive zone. Right after the seismic doublet occurrence, a surface rupture with a primarily east-west orientation was observed. The idea of having an almost vertically dipped fault plane for the first shock is more consistent with the trace of the upper edge on the surface and the focal mechanism solutions which propose a steady dipping EW. Previous studies propose different geometries for the generating faults of the second earthquake. In this study, we associate the surface rupture with the first mainshock and both nodal plane explaining the relationship between the two main seismic events are discussed after Coulomb failure stress calculation due to the first shock. Then the stress transfer because of the doublet is analyzed in order to determine its consistency with the statistical modeling prediction for the aftershock population and spatial distribution. For statistical modeling a temporal version of Epidemic Type Aftershock Sequence (ETAS) is applied on one-year seismicity including events with minimum magnitude of 2.5.
publishDate 2017
dc.date.none.fl_str_mv 2017
2017-10-23
dc.type.none.fl_str_mv book part
http://purl.org/coar/resource_type/c_3248
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/bookPart
format bookPart
dc.identifier.none.fl_str_mv https://riunet.upv.es/handle/10251/100651
url https://riunet.upv.es/handle/10251/100651
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Reconocimiento - No comercial - Sin obra derivada (by-nc-nd)
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Reconocimiento - No comercial - Sin obra derivada (by-nc-nd)
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Editorial Universitat Politècnica de València
publisher.none.fl_str_mv Editorial Universitat Politècnica de València
dc.source.none.fl_str_mv reponame:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
instname:Universitat Politècnica de València (UPV)
instname_str Universitat Politècnica de València (UPV)
reponame_str RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
collection RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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