Fault plane picking from focal mechanisms in reverse faulting stress: Application to the Mw6.9 Boumerdes (Algeria) earthquake sequence
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 knowl...
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| Published in: | Journal of African earth sciences (1994) Vol. 196; p. 104729 |
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| Abstract | 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.
•Fault instability and slip angle methods were used to select fault planes from focal mechanisms.•A new formula for the instability coefficient has been established.•Probability of picking fault planes from focal mechanisms was evaluated.•Tectonic analysis from the focal mechanisms of the Mw6.9 Boumerdes (Algeria) earthquake sequence. |
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| AbstractList | 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.
•Fault instability and slip angle methods were used to select fault planes from focal mechanisms.•A new formula for the instability coefficient has been established.•Probability of picking fault planes from focal mechanisms was evaluated.•Tectonic analysis from the focal mechanisms of the Mw6.9 Boumerdes (Algeria) earthquake sequence. |
| ArticleNumber | 104729 |
| Author | Bezzeghoud, Mourad Vavryčuk, Václav Boughacha, Mohamed Salah Ouyed, Reda |
| Author_xml | – sequence: 1 givenname: Reda surname: Ouyed fullname: Ouyed, Reda email: rouyed@usthb.dz organization: Laboratoire de Géophysique, Faculté des Sciences de la Terre, de la Géographie et de l’Aménagement du Territoire, Université des Sciences et de la Technologie Houari Boumediene (USTHB), Algiers, Algeria – sequence: 2 givenname: Mohamed Salah surname: Boughacha fullname: Boughacha, Mohamed Salah organization: Laboratoire de Géophysique, Faculté des Sciences de la Terre, de la Géographie et de l’Aménagement du Territoire, Université des Sciences et de la Technologie Houari Boumediene (USTHB), Algiers, Algeria – sequence: 3 givenname: Mourad surname: Bezzeghoud fullname: Bezzeghoud, Mourad organization: Departamento de Física and Centro de Geofísica Évora, Instituto de Ciências da Terra, Universidade de Évora, Évora, Portugal – sequence: 4 givenname: Václav surname: Vavryčuk fullname: Vavryčuk, Václav organization: Institute of Geophysics, Czech Academy of Sciences, Prague, Czech Republic |
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| Cites_doi | 10.1029/1999JB900111 10.1093/gji/ggu224 10.1111/j.1365-246X.1982.tb02766.x 10.1086/625831 10.1007/BF00876528 10.2113/gssgfbull.S7-XI.5.729 10.1785/gssrl.81.5.732 10.1029/JB089iB07p05835 10.1029/JB092iB01p00357 10.1029/2007JB005257 10.1007/s00024-003-2468-z 10.1029/2004GL020687 10.1029/2004GL020466 10.1007/s00024-017-1571-5 10.1029/JB089iB13p11517 10.1029/2004GL019884 10.1016/j.tecto.2013.01.025 10.1029/JB094iB05p05585 10.1029/JB089iB11p09305 10.1016/0098-3004(90)90105-3 10.1002/2016JB013493 10.1016/0040-1951(79)90081-7 10.1016/0040-1951(82)90092-0 10.1017/S0016756800059987 10.1016/j.jseaes.2017.09.017 10.1016/S0040-1951(03)00234-8 10.1016/j.epsl.2011.03.002 |
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| Keywords | Focal mechanisms Fault identification Slip angle criterion Fault instability method |
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| Snippet | Identification of the fault plane from two nodal planes of the focal mechanism is, in general, ambiguous. This problem is commonly solved using other... |
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| SubjectTerms | Fault identification Fault instability method Focal mechanisms Slip angle criterion |
| Title | Fault plane picking from focal mechanisms in reverse faulting stress: Application to the Mw6.9 Boumerdes (Algeria) earthquake sequence |
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