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Fault plane picking from focal mechanisms in reverse faulting stress: Application to the Mw6.9 Boumerdes (Algeria) earthquake sequence
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SYSNO ASEP 0562033 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Fault plane picking from focal mechanisms in reverse faulting stress: Application to the Mw6.9 Boumerdes (Algeria) earthquake sequence Author(s) Ouyed, R. (DZ)
Boughacha, M. S. (DZ)
Bezzeghoud, M. (PT)
Vavryčuk, Václav (GFU-E) ORCID, RIDArticle number 104729 Source Title Journal of African Earth Sciences. - : Elsevier - ISSN 1464-343X
Roč. 196, December (2022)Number of pages 12 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords focal mechanisms ; fault identification ; fault instability method ; slip angle criterion Subject RIV DC - Siesmology, Volcanology, Earth Structure OECD category Volcanology R&D Projects GA22-10747S GA ČR - Czech Science Foundation (CSF) Method of publishing Open access Institutional support GFU-E - RVO:67985530 UT WOS 000867986800001 EID SCOPUS 85139366079 DOI 10.1016/j.jafrearsci.2022.104729 Annotation 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. Workplace Geophysical Institute Contact Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Year of Publishing 2023 Electronic address https://www.sciencedirect.com/science/article/pii/S1464343X22002813
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