The 8 October 2011 Earthquake at El Hierro (Mw 4.0): Focal Mechanisms of the Mainshock and Its Foreshocks

We have studied the focal mechanism of an Mw 4.0 earthquake that occurred on 8 October 2011 in the southwest of El Hierro (Canary Islands), the largest shock of the swarm that preceded the submarine eruption of El Hierro 2011–2012. The joint focal mechanism solution of 34 foreshocks has also been ob...

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Detalles Bibliográficos
Autores: Fresno, Carlos del, Domínguez Cerdeña, Itahiza, Cesca, S., Buforn, Elisa
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2014
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/112790
Acceso en línea:http://hdl.handle.net/10261/112790
Access Level:acceso abierto
Palabra clave:Earthquakes
Seismology
El Hierro
Canary Islands
Terremotos
Sismología
Islas Canarias
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spelling The 8 October 2011 Earthquake at El Hierro (Mw 4.0): Focal Mechanisms of the Mainshock and Its ForeshocksFresno, Carlos delDomínguez Cerdeña, ItahizaCesca, S.Buforn, ElisaEarthquakesSeismologyEl HierroCanary IslandsTerremotosSismologíaIslas CanariasWe have studied the focal mechanism of an Mw 4.0 earthquake that occurred on 8 October 2011 in the southwest of El Hierro (Canary Islands), the largest shock of the swarm that preceded the submarine eruption of El Hierro 2011–2012. The joint focal mechanism solution of 34 foreshocks has also been obtained. The results for the mainshock are consistent with a pure double‐couple mechanism of a strike‐slip motion with a reverse component and a focal depth of 12–13 km. The stress pattern obtained from the focal mechanism indicates horizontal compression in a north‐northwest–south‐southeast direction, parallel to the southern ridge of the island, and a quasi‐horizontal extension in an east–west direction. Similar stress pattern is derived from the joint solution of the foreshocks. The occurrence of this family of earthquakes at the moment of the maximum strain rate of the pre‐eruptive swarm suggests that their rupture process is related to tectonic stress, which led to the eruption only two days later, 5 km away from the mainshock epicenter.Peer reviewedSeismological Society of AmericaConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201520152014info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/112790reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1127902026-05-22T06:33:51Z
dc.title.none.fl_str_mv The 8 October 2011 Earthquake at El Hierro (Mw 4.0): Focal Mechanisms of the Mainshock and Its Foreshocks
title The 8 October 2011 Earthquake at El Hierro (Mw 4.0): Focal Mechanisms of the Mainshock and Its Foreshocks
spellingShingle The 8 October 2011 Earthquake at El Hierro (Mw 4.0): Focal Mechanisms of the Mainshock and Its Foreshocks
Fresno, Carlos del
Earthquakes
Seismology
El Hierro
Canary Islands
Terremotos
Sismología
Islas Canarias
title_short The 8 October 2011 Earthquake at El Hierro (Mw 4.0): Focal Mechanisms of the Mainshock and Its Foreshocks
title_full The 8 October 2011 Earthquake at El Hierro (Mw 4.0): Focal Mechanisms of the Mainshock and Its Foreshocks
title_fullStr The 8 October 2011 Earthquake at El Hierro (Mw 4.0): Focal Mechanisms of the Mainshock and Its Foreshocks
title_full_unstemmed The 8 October 2011 Earthquake at El Hierro (Mw 4.0): Focal Mechanisms of the Mainshock and Its Foreshocks
title_sort The 8 October 2011 Earthquake at El Hierro (Mw 4.0): Focal Mechanisms of the Mainshock and Its Foreshocks
dc.creator.none.fl_str_mv Fresno, Carlos del
Domínguez Cerdeña, Itahiza
Cesca, S.
Buforn, Elisa
author Fresno, Carlos del
author_facet Fresno, Carlos del
Domínguez Cerdeña, Itahiza
Cesca, S.
Buforn, Elisa
author_role author
author2 Domínguez Cerdeña, Itahiza
Cesca, S.
Buforn, Elisa
author2_role author
author
author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Earthquakes
Seismology
El Hierro
Canary Islands
Terremotos
Sismología
Islas Canarias
topic Earthquakes
Seismology
El Hierro
Canary Islands
Terremotos
Sismología
Islas Canarias
description We have studied the focal mechanism of an Mw 4.0 earthquake that occurred on 8 October 2011 in the southwest of El Hierro (Canary Islands), the largest shock of the swarm that preceded the submarine eruption of El Hierro 2011–2012. The joint focal mechanism solution of 34 foreshocks has also been obtained. The results for the mainshock are consistent with a pure double‐couple mechanism of a strike‐slip motion with a reverse component and a focal depth of 12–13 km. The stress pattern obtained from the focal mechanism indicates horizontal compression in a north‐northwest–south‐southeast direction, parallel to the southern ridge of the island, and a quasi‐horizontal extension in an east–west direction. Similar stress pattern is derived from the joint solution of the foreshocks. The occurrence of this family of earthquakes at the moment of the maximum strain rate of the pre‐eruptive swarm suggests that their rupture process is related to tectonic stress, which led to the eruption only two days later, 5 km away from the mainshock epicenter.
publishDate 2014
dc.date.none.fl_str_mv 2014
2015
2015
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/112790
url http://hdl.handle.net/10261/112790
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Seismological Society of America
publisher.none.fl_str_mv Seismological Society of America
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869405139213746176
score 15,811543

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