Fault plane picking from focal mechanisms in reverse faulting stress: Application to the Mw6.9 Boumerdes (Algeria) earthquake sequence
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10174/32990 https://doi.org/25. Ouyed R., M.S. Boughacha, M. Bezzeghoud, V. Vavryčuk, 2022. Fault plane picking from focal mechanisms in reverse faulting stress: Application to the Mw6.9 Boumerdes (Algeria) earthquake sequence. Journal of African Earth Sciences 196 (2022) 104729, https://doi.org/10.1016/j.jafrearsci.2022.104729 https://doi.org/10.1016/j.jafrearsci.2022.104729 |
Resumo: | Identification of the fault plane from two nodal planes of the focal mechanism is, in general, ambiguous. This problem is commonly solved using other constraints provided by tectonic, geological or seismic studies. In this paper, we evaluate the probability of identifying the fault plane using knowledge of stress field. We employ two alternative methods: (1) the slip angle method (SA), and (2) the highest instability method (IS). First, the efficiency of the methods was tested on synthetic data consisting of focal mechanisms compatible with a reverse stress regime. The tests revealed that the fraction of faults correctly picked by the IS method is higher than that of the SA method, particularly for large noise values. Second, the methods were applied to the aftershocks of the Boumerdes (Algeria) earthquake of May 21, 2003. This application showed that when taking into account the focal solutions for which the fault planes are determined using the IS method with a high probability, we observe consistency between the selected faults and the tectonics of the study area. |
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Fault plane picking from focal mechanisms in reverse faulting stress: Application to the Mw6.9 Boumerdes (Algeria) earthquake sequenceFocal mechanismsFault identificationFault instability methodSlip angle criterionIdentification of the fault plane from two nodal planes of the focal mechanism is, in general, ambiguous. This problem is commonly solved using other constraints provided by tectonic, geological or seismic studies. In this paper, we evaluate the probability of identifying the fault plane using knowledge of stress field. We employ two alternative methods: (1) the slip angle method (SA), and (2) the highest instability method (IS). First, the efficiency of the methods was tested on synthetic data consisting of focal mechanisms compatible with a reverse stress regime. The tests revealed that the fraction of faults correctly picked by the IS method is higher than that of the SA method, particularly for large noise values. Second, the methods were applied to the aftershocks of the Boumerdes (Algeria) earthquake of May 21, 2003. This application showed that when taking into account the focal solutions for which the fault planes are determined using the IS method with a high probability, we observe consistency between the selected faults and the tectonics of the study area.The research was partially supported by Czech Science Foundation, grant no 22-10747S.Elsevier2022-12-29T16:25:08Z2022-12-292022-09-20T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/32990https://doi.org/25. Ouyed R., M.S. Boughacha, M. Bezzeghoud, V. Vavryčuk, 2022. Fault plane picking from focal mechanisms in reverse faulting stress: Application to the Mw6.9 Boumerdes (Algeria) earthquake sequence. Journal of African Earth Sciences 196 (2022) 104729, https://doi.org/10.1016/j.jafrearsci.2022.104729https://doi.org/10.1016/j.jafrearsci.2022.104729http://hdl.handle.net/10174/32990https://doi.org/10.1016/j.jafrearsci.2022.104729eng196Journal of African Earth Sciencesndndmourad@uevora.ptnd393Ouyed, RedaBoughacha, Mohamed S.Bezzeghoud, MouradVavryčuk, Václavinfo: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:RCAAP2024-01-03T19:34:13Zoai:dspace.uevora.pt:10174/32990Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:21:53.071208Repositório 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 |
Fault plane picking from focal mechanisms in reverse faulting stress: Application to the Mw6.9 Boumerdes (Algeria) earthquake sequence |
title |
Fault plane picking from focal mechanisms in reverse faulting stress: Application to the Mw6.9 Boumerdes (Algeria) earthquake sequence |
spellingShingle |
Fault plane picking from focal mechanisms in reverse faulting stress: Application to the Mw6.9 Boumerdes (Algeria) earthquake sequence Ouyed, Reda Focal mechanisms Fault identification Fault instability method Slip angle criterion |
title_short |
Fault plane picking from focal mechanisms in reverse faulting stress: Application to the Mw6.9 Boumerdes (Algeria) earthquake sequence |
title_full |
Fault plane picking from focal mechanisms in reverse faulting stress: Application to the Mw6.9 Boumerdes (Algeria) earthquake sequence |
title_fullStr |
Fault plane picking from focal mechanisms in reverse faulting stress: Application to the Mw6.9 Boumerdes (Algeria) earthquake sequence |
title_full_unstemmed |
Fault plane picking from focal mechanisms in reverse faulting stress: Application to the Mw6.9 Boumerdes (Algeria) earthquake sequence |
title_sort |
Fault plane picking from focal mechanisms in reverse faulting stress: Application to the Mw6.9 Boumerdes (Algeria) earthquake sequence |
author |
Ouyed, Reda |
author_facet |
Ouyed, Reda Boughacha, Mohamed S. Bezzeghoud, Mourad Vavryčuk, Václav |
author_role |
author |
author2 |
Boughacha, Mohamed S. Bezzeghoud, Mourad Vavryčuk, Václav |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Ouyed, Reda Boughacha, Mohamed S. Bezzeghoud, Mourad Vavryčuk, Václav |
dc.subject.por.fl_str_mv |
Focal mechanisms Fault identification Fault instability method Slip angle criterion |
topic |
Focal mechanisms Fault identification Fault instability method Slip angle criterion |
description |
Identification of the fault plane from two nodal planes of the focal mechanism is, in general, ambiguous. This problem is commonly solved using other constraints provided by tectonic, geological or seismic studies. In this paper, we evaluate the probability of identifying the fault plane using knowledge of stress field. We employ two alternative methods: (1) the slip angle method (SA), and (2) the highest instability method (IS). First, the efficiency of the methods was tested on synthetic data consisting of focal mechanisms compatible with a reverse stress regime. The tests revealed that the fraction of faults correctly picked by the IS method is higher than that of the SA method, particularly for large noise values. Second, the methods were applied to the aftershocks of the Boumerdes (Algeria) earthquake of May 21, 2003. This application showed that when taking into account the focal solutions for which the fault planes are determined using the IS method with a high probability, we observe consistency between the selected faults and the tectonics of the study area. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-12-29T16:25:08Z 2022-12-29 2022-09-20T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10174/32990 https://doi.org/25. Ouyed R., M.S. Boughacha, M. Bezzeghoud, V. Vavryčuk, 2022. Fault plane picking from focal mechanisms in reverse faulting stress: Application to the Mw6.9 Boumerdes (Algeria) earthquake sequence. Journal of African Earth Sciences 196 (2022) 104729, https://doi.org/10.1016/j.jafrearsci.2022.104729 https://doi.org/10.1016/j.jafrearsci.2022.104729 http://hdl.handle.net/10174/32990 https://doi.org/10.1016/j.jafrearsci.2022.104729 |
url |
http://hdl.handle.net/10174/32990 https://doi.org/25. Ouyed R., M.S. Boughacha, M. Bezzeghoud, V. Vavryčuk, 2022. Fault plane picking from focal mechanisms in reverse faulting stress: Application to the Mw6.9 Boumerdes (Algeria) earthquake sequence. Journal of African Earth Sciences 196 (2022) 104729, https://doi.org/10.1016/j.jafrearsci.2022.104729 https://doi.org/10.1016/j.jafrearsci.2022.104729 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
196 Journal of African Earth Sciences nd nd mourad@uevora.pt nd 393 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799136700598845440 |