Stress fields in the Iberian-Maghrebi region

This study concerns the present stress field between the Eurasian and African plates in the Iberian-Maghrebi region (Portugal, Spain, Morocco, Algeria and Tunisia). In addition to an up-to-date catalogue of earthquakes in this area, a catalogue of the focal mechanisms composed of 486 solutions of fa...

Descripción completa

Detalles Bibliográficos
Autores: Henares, J., López Casado, C., Sanz de Galdeano, C., Delgado, J., Peláez, J.A.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2003
País:España
Institución:Universidad de Jaén
Repositorio:RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
OAI Identifier:oai:ruja.ujaen.es:10953/6959
Acceso en línea:https://doi.org/10.1023/A:1021294015027
https://hdl.handle.net/10953/6959
Access Level:acceso abierto
Palabra clave:Betic Cordillera
Iberian-Maghrebi region
Focal mechanism
Stress field
55
id ES_18e9638dc4e3b41b3c6b4f18c3da33f2
oai_identifier_str oai:ruja.ujaen.es:10953/6959
network_acronym_str ES
network_name_str España
repository_id_str
spelling Stress fields in the Iberian-Maghrebi regionHenares, J.López Casado, C.Sanz de Galdeano, C.Delgado, J.Peláez, J.A.Betic CordilleraIberian-Maghrebi regionFocal mechanismStress field55This study concerns the present stress field between the Eurasian and African plates in the Iberian-Maghrebi region (Portugal, Spain, Morocco, Algeria and Tunisia). In addition to an up-to-date catalogue of earthquakes in this area, a catalogue of the focal mechanisms composed of 486 solutions of fault planes,standardized in terms of notation and information type, was used. These data were used applying the right-dihedron method of Angelier and Mechler (1977), to obtain different zones with homogeneous stress. The results obtained for shallow earthquakes (h < 30 km) coincide, in the majority of cases, with the general stress fields proposed by numerous authors for this region, according to which there is NW-SE compression. However, the stress orientation appears to vary in certain areas, perhaps perturbed by the opening of the Atlantic Ocean, the approach of Iberia and Africa, or the extension of the Alboran Sea. For the intermediate earthquakes (30 < h< 150 km) no general pattern was found,and the P and T axes seem to be randomly oriented for the depth intervals considered. For the very deep earthquakes(h > 600 km), however, the P axis lies in a NNW-SSE direction, dipping towards the SSE, while the T axis is subhorizontal in a NE-SW direction. The determinations from the focal mechanisms highlight the existence of a regional stress field with a subhorizontal compression axis trending NW-SE. Superimposed are others that specifically affect particular sectors; these are related to the opening of the Atlantic Ocean, the extension of the Betic Cordillera and the Alboran Sea, and even the present compression between the Iberian and European plates.This work was supported by the Dirección General de Enseñanza Superior e Investigación Científica (AMB97-0975-C02-01, PB97-1267-C03-01 and BTE2000-0339) and the Research Groups of the Junta de Andalucía RNM-0217, and Generalitat Valenciana GR00-22.Springer Nature202620262003info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://doi.org/10.1023/A:1021294015027https://hdl.handle.net/10953/6959reponame:RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaéninstname:Universidad de JaénInglésJournal of SeismologyCC0 1.0 Universalhttp://creativecommons.org/publicdomain/zero/1.0/info:eu-repo/semantics/openAccessoai:ruja.ujaen.es:10953/69592026-06-24T12:41:07Z
dc.title.none.fl_str_mv Stress fields in the Iberian-Maghrebi region
title Stress fields in the Iberian-Maghrebi region
spellingShingle Stress fields in the Iberian-Maghrebi region
Henares, J.
Betic Cordillera
Iberian-Maghrebi region
Focal mechanism
Stress field
55
title_short Stress fields in the Iberian-Maghrebi region
title_full Stress fields in the Iberian-Maghrebi region
title_fullStr Stress fields in the Iberian-Maghrebi region
title_full_unstemmed Stress fields in the Iberian-Maghrebi region
title_sort Stress fields in the Iberian-Maghrebi region
dc.creator.none.fl_str_mv Henares, J.
López Casado, C.
Sanz de Galdeano, C.
Delgado, J.
Peláez, J.A.
author Henares, J.
author_facet Henares, J.
López Casado, C.
Sanz de Galdeano, C.
Delgado, J.
Peláez, J.A.
author_role author
author2 López Casado, C.
Sanz de Galdeano, C.
Delgado, J.
Peláez, J.A.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Betic Cordillera
Iberian-Maghrebi region
Focal mechanism
Stress field
55
topic Betic Cordillera
Iberian-Maghrebi region
Focal mechanism
Stress field
55
description This study concerns the present stress field between the Eurasian and African plates in the Iberian-Maghrebi region (Portugal, Spain, Morocco, Algeria and Tunisia). In addition to an up-to-date catalogue of earthquakes in this area, a catalogue of the focal mechanisms composed of 486 solutions of fault planes,standardized in terms of notation and information type, was used. These data were used applying the right-dihedron method of Angelier and Mechler (1977), to obtain different zones with homogeneous stress. The results obtained for shallow earthquakes (h < 30 km) coincide, in the majority of cases, with the general stress fields proposed by numerous authors for this region, according to which there is NW-SE compression. However, the stress orientation appears to vary in certain areas, perhaps perturbed by the opening of the Atlantic Ocean, the approach of Iberia and Africa, or the extension of the Alboran Sea. For the intermediate earthquakes (30 < h< 150 km) no general pattern was found,and the P and T axes seem to be randomly oriented for the depth intervals considered. For the very deep earthquakes(h > 600 km), however, the P axis lies in a NNW-SSE direction, dipping towards the SSE, while the T axis is subhorizontal in a NE-SW direction. The determinations from the focal mechanisms highlight the existence of a regional stress field with a subhorizontal compression axis trending NW-SE. Superimposed are others that specifically affect particular sectors; these are related to the opening of the Atlantic Ocean, the extension of the Betic Cordillera and the Alboran Sea, and even the present compression between the Iberian and European plates.
publishDate 2003
dc.date.none.fl_str_mv 2003
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://doi.org/10.1023/A:1021294015027
https://hdl.handle.net/10953/6959
url https://doi.org/10.1023/A:1021294015027
https://hdl.handle.net/10953/6959
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Journal of Seismology
dc.rights.none.fl_str_mv CC0 1.0 Universal
http://creativecommons.org/publicdomain/zero/1.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv CC0 1.0 Universal
http://creativecommons.org/publicdomain/zero/1.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Springer Nature
publisher.none.fl_str_mv Springer Nature
dc.source.none.fl_str_mv reponame:RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
instname:Universidad de Jaén
instname_str Universidad de Jaén
reponame_str RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
collection RUJA. Repositorio Institucional de la Producción Científica de la Universidad de Jaén
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869404014025637888
score 15.812429

Similares en LA Referencia