Abstract
This work is aimed at understanding the interaction between faults of three moderate events of the seismic sequence which occurred on May 2010 in the region of Beni-Ilmane which belongs to the Hodna-Biban domain (east of Algeria). This seismic sequence occurred on a complex faulted fold located in the Biban region in the southern part of the Tellian Atlas. The first shock occurred on May 14, 2010, at 12:29 GMT (Mw = 5.5) either on a dextral plane oriented [Strike, Dip, Rake: 254°, 74°, 175°] or on a sinistral plane oriented [Strike, Dip, Rake: 345, 85, 16]. Based on the stress change modeling, the fault plane with [Strike, Dip, Rake: 254°, 74°, 175°] is the one played for the first shock and starting the seismic sequence. I have also shown that the plane of the second shock which occurred on May 16 at 06:52 GMT (Mw = 5.1) oriented [Strike, Dip, Rake: 250°, 55°, 120°] is loaded by the first shock (Coulomb stress changes = 0.19 bar). The third shock occurred on May 23 at 13:28 GMT (Mw = 5.2) with plane oriented [Strike, Dip, Rake: 12°, 57°, 12°] was loaded by the two previous shocks (Coulomb stress changes = 0.04 bar). I have correlated aftershocks occurred during this seismic sequence with Coulomb stress changes modeling taking into account the contribution of the regional stress tensor shows that the greatest number of aftershocks is located in positive areas of total Coulomb stress changes with a percentage that exceeds 65%. The best results are obtained for thrust optimal planes oriented NE-SW.
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Acknowledgments
I am grateful to Prof. Mustapha Meghraoui (University of Strasbourg, France) for reading an early version of the article and for his valuable comments. I also thank anonymous reviewers for their valuable comments and suggestions for improving the article. I thank Prof. Yelles-Chaouche Abdelkrim for providing me the aftershocks catalog of the seismic sequence.
Funding
This study is supported by the Centre de Recherche en Astronomie Astrophysique et Géophysique (CRAAG, Ministry of Interior) and the Seismology Division.
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This article is part of the Topical Collection on Seismic Hazard and Risk in Africa
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Beldjoudi, H. Fault interaction for the Beni-Ilmane (east of Algeria) seismic sequence on May 2010. Arab J Geosci 13, 959 (2020). https://doi.org/10.1007/s12517-020-05968-6
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DOI: https://doi.org/10.1007/s12517-020-05968-6