Intermediate depth and deep earthquakes: complexity of the Ibero-Magrhebian region
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Outros Autores: | , , , |
Tipo de documento: | Artigo de conferência |
Idioma: | por |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10174/6488 |
Resumo: | The Ibero-Magrhebian region is located at the plate boundary between Eurasia and Africa and it is a tectonically complex region. A sign of the complexity, is the occurrence of intermediate depth earthquakes (40<h<150 km), located in south Spain, between Granada- Malaga and at the west part of Alboran Sea, together with the occurrence of very deep earthquakes (h≈650 km) near Dúrcal (Granada). Intermediate depth shocks are mostly confined within a relatively narrow region (50 km width) located East of Gibraltar, extending NNE-SSW from the Malaga (Spain) area to a region offshore the Moroccan coast. We have studied focal mechanisms of these earthquakes from inversion of body wave. The stress pattern in the Ibero-Maghrebian region obtained from solutions of selected shallow, intermediate depth and deep shocks show the complexity of the region. The seismotectonic scheme show horizontal compression in NNW-SSE direction in the Gulf of Cádiz. In northern Africa, the stress pattern changes and it corresponds to strike-slip motion, with extends from west of the Gibraltar Strait until the western Algeria, where in the Oran region the horizontal compression N-S reapers, with a clear domain of the thrusting faults in Algeria. In the Alboran Sea there is horizontal extension in E-W direction for shallow events. The intermediate depth shock located at the western part of the Alboran Sea show a change on the stress pattern: to the west of 4.5oW, focal mechanisms show vertical tension axis, while to the east, they show vertical pressure axis. These stress orientations are not present in deep earthquakes, where the pressure axes dip 45o to the east. The intermediate and deep earthquakes may be related to some kind of subduction or delamination processes, more recent for the intermediate depth shocks and older for the very deep activity. |
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Intermediate depth and deep earthquakes: complexity of the Ibero-Magrhebian regionIbero-Magrhebian regionIntermediate depth and deep earthquakesFocal MechanismsThe Ibero-Magrhebian region is located at the plate boundary between Eurasia and Africa and it is a tectonically complex region. A sign of the complexity, is the occurrence of intermediate depth earthquakes (40<h<150 km), located in south Spain, between Granada- Malaga and at the west part of Alboran Sea, together with the occurrence of very deep earthquakes (h≈650 km) near Dúrcal (Granada). Intermediate depth shocks are mostly confined within a relatively narrow region (50 km width) located East of Gibraltar, extending NNE-SSW from the Malaga (Spain) area to a region offshore the Moroccan coast. We have studied focal mechanisms of these earthquakes from inversion of body wave. The stress pattern in the Ibero-Maghrebian region obtained from solutions of selected shallow, intermediate depth and deep shocks show the complexity of the region. The seismotectonic scheme show horizontal compression in NNW-SSE direction in the Gulf of Cádiz. In northern Africa, the stress pattern changes and it corresponds to strike-slip motion, with extends from west of the Gibraltar Strait until the western Algeria, where in the Oran region the horizontal compression N-S reapers, with a clear domain of the thrusting faults in Algeria. In the Alboran Sea there is horizontal extension in E-W direction for shallow events. The intermediate depth shock located at the western part of the Alboran Sea show a change on the stress pattern: to the west of 4.5oW, focal mechanisms show vertical tension axis, while to the east, they show vertical pressure axis. These stress orientations are not present in deep earthquakes, where the pressure axes dip 45o to the east. The intermediate and deep earthquakes may be related to some kind of subduction or delamination processes, more recent for the intermediate depth shocks and older for the very deep activity.2012-12-05T21:35:15Z2012-12-052010-05-15T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjecthttp://hdl.handle.net/10174/6488http://hdl.handle.net/10174/6488porBuforn E., Cesca S., M. Bezzeghoud, del Fresno C. and Udías, A., 2010. Intermediate depth and deep earthquakes: complexity of the Ibero-Magrhebian region. International Conference on “Geophysics, Geodesy and Tectonics of the North Africa Plate Boundary for a Better Earthquake and Tsunami Hazard Assessments”. ICTP – International Center for Theoritical Physics (Trieste, Italy), Argel, 15-21 Maio 2010.Algiers (Algeria)1Intermediate depth and deep earthquakes: complexity of the Ibero-Magrhebian regionsimsimnaoCentro de Geofísica de Évora e departamento de Física da Universidade de Évorandndmourad@uevora.ptndnd393Buforn, E.Cesca, S.Bezzeghoud, M.del Fresno, C.Udias, A.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T18:45:54Zoai:dspace.uevora.pt:10174/6488Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:01:12.542311Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Intermediate depth and deep earthquakes: complexity of the Ibero-Magrhebian region |
title |
Intermediate depth and deep earthquakes: complexity of the Ibero-Magrhebian region |
spellingShingle |
Intermediate depth and deep earthquakes: complexity of the Ibero-Magrhebian region Buforn, E. Ibero-Magrhebian region Intermediate depth and deep earthquakes Focal Mechanisms |
title_short |
Intermediate depth and deep earthquakes: complexity of the Ibero-Magrhebian region |
title_full |
Intermediate depth and deep earthquakes: complexity of the Ibero-Magrhebian region |
title_fullStr |
Intermediate depth and deep earthquakes: complexity of the Ibero-Magrhebian region |
title_full_unstemmed |
Intermediate depth and deep earthquakes: complexity of the Ibero-Magrhebian region |
title_sort |
Intermediate depth and deep earthquakes: complexity of the Ibero-Magrhebian region |
author |
Buforn, E. |
author_facet |
Buforn, E. Cesca, S. Bezzeghoud, M. del Fresno, C. Udias, A. |
author_role |
author |
author2 |
Cesca, S. Bezzeghoud, M. del Fresno, C. Udias, A. |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Buforn, E. Cesca, S. Bezzeghoud, M. del Fresno, C. Udias, A. |
dc.subject.por.fl_str_mv |
Ibero-Magrhebian region Intermediate depth and deep earthquakes Focal Mechanisms |
topic |
Ibero-Magrhebian region Intermediate depth and deep earthquakes Focal Mechanisms |
description |
The Ibero-Magrhebian region is located at the plate boundary between Eurasia and Africa and it is a tectonically complex region. A sign of the complexity, is the occurrence of intermediate depth earthquakes (40<h<150 km), located in south Spain, between Granada- Malaga and at the west part of Alboran Sea, together with the occurrence of very deep earthquakes (h≈650 km) near Dúrcal (Granada). Intermediate depth shocks are mostly confined within a relatively narrow region (50 km width) located East of Gibraltar, extending NNE-SSW from the Malaga (Spain) area to a region offshore the Moroccan coast. We have studied focal mechanisms of these earthquakes from inversion of body wave. The stress pattern in the Ibero-Maghrebian region obtained from solutions of selected shallow, intermediate depth and deep shocks show the complexity of the region. The seismotectonic scheme show horizontal compression in NNW-SSE direction in the Gulf of Cádiz. In northern Africa, the stress pattern changes and it corresponds to strike-slip motion, with extends from west of the Gibraltar Strait until the western Algeria, where in the Oran region the horizontal compression N-S reapers, with a clear domain of the thrusting faults in Algeria. In the Alboran Sea there is horizontal extension in E-W direction for shallow events. The intermediate depth shock located at the western part of the Alboran Sea show a change on the stress pattern: to the west of 4.5oW, focal mechanisms show vertical tension axis, while to the east, they show vertical pressure axis. These stress orientations are not present in deep earthquakes, where the pressure axes dip 45o to the east. The intermediate and deep earthquakes may be related to some kind of subduction or delamination processes, more recent for the intermediate depth shocks and older for the very deep activity. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-05-15T00:00:00Z 2012-12-05T21:35:15Z 2012-12-05 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/conferenceObject |
format |
conferenceObject |
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publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10174/6488 http://hdl.handle.net/10174/6488 |
url |
http://hdl.handle.net/10174/6488 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
Buforn E., Cesca S., M. Bezzeghoud, del Fresno C. and Udías, A., 2010. Intermediate depth and deep earthquakes: complexity of the Ibero-Magrhebian region. International Conference on “Geophysics, Geodesy and Tectonics of the North Africa Plate Boundary for a Better Earthquake and Tsunami Hazard Assessments”. ICTP – International Center for Theoritical Physics (Trieste, Italy), Argel, 15-21 Maio 2010. Algiers (Algeria) 1 Intermediate depth and deep earthquakes: complexity of the Ibero-Magrhebian region sim sim nao Centro de Geofísica de Évora e departamento de Física da Universidade de Évora nd nd mourad@uevora.pt nd nd 393 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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