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Recent Seismic Activity in the Bejaia–Babors Region (Northeastern Algeria): The Case of the 2012–2013 Bejaia Earthquake Sequences

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Abstract

From November 2012 to May 2013, the coastal region of Bejaia (northeastern Algeria), experienced three distinct seismic sequences in about 6 months. The first one was on 28 November 2012 started with a mainshock of magnitude Mw = 5.1, and the second one occurred on 22 February 2013, a few kilometers southeast from the first one and culminated with a magnitude Mw = 4.3 earthquake. The last sequence comprised two shocks of moderate magnitude: a Mw 5.2 event on 19 May 2013, followed by a Mw 5.0 event on 26 May. Earthquakes were relocated using the double-difference method with differential times derived from phase-picked data and waveform cross-correlation delays. We compiled a dataset of 252 accurately relocated events that are associated with focal mechanism solutions consistent with a near-vertical, right-lateral strike-slip fault striking NW–SE. The data analysis is coherent with a new fault extending over 35 km from the Gulf of Bejaia to the northeast of Kherrata. This newly discovered active fault, we name it the Babors Transverse Fault, appears to be segmented in four segments (S1–S4) evidenced by separate earthquake clusters. Static Coulomb stress changes and the spatiotemporal evolution of seismicity suggest static stress triggering, with the rupture first activated in the S1 segment in the northwest, migrating to S2, and terminating in S3 and S4 in the southeast. Stress tensor inversion from focal mechanisms implies that the dominant local stress field is a pure strike-slip regime, with N–S maximum horizontal compression in good agreement with the velocity field displaying reorientation compared to the oblique convergence of Africa–Eurasia. In this study, the newly identified Babors Transverse and Tizi N’Berber–Darguinah faults, in association with the NNW–SSE offshore active fault of the Greater Kabylian block (in the north) and the NNW–SSE right-lateral strike-slip Lâalam fault (in the south), form an en echelon fault system that acts as a transfer zone between offshore thrust faulting and the Ghardimaou–North Constantine strike-slip fault.

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Authors and Affiliations

  1. CRAAG, Centre de Recherche en Astronomie Astrophysique et Géophysique, Route de L’Observatoire B.P. 63 Bouzaréah, 16340, Algiers, Algeria

    Oualid Boulahia, Issam Abacha, AbdelKarim Yelles-Chaouche, Hichem Bendjama, Abdelaziz Kherroubi, Yahia Mohammedi, Chafik Aidi & Adel Chami

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  1. Oualid Boulahia
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  2. Issam Abacha
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  3. AbdelKarim Yelles-Chaouche
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  4. Hichem Bendjama
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  5. Abdelaziz Kherroubi
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  6. Yahia Mohammedi
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  7. Chafik Aidi
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  8. Adel Chami
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Correspondence to Oualid Boulahia.

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24_2021_2711_MOESM1_ESM.tif

Lower hemisphere equal-area projections of the focal sphere for the current study earthquakes. The polarity observations at each station are shown as plain circles: white if the polarity was compressional and black if it was dilatational (TIF 5076 kb)

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Boulahia, O., Abacha, I., Yelles-Chaouche, A. et al. Recent Seismic Activity in the Bejaia–Babors Region (Northeastern Algeria): The Case of the 2012–2013 Bejaia Earthquake Sequences. Pure Appl. Geophys. 178, 1253–1279 (2021). https://doi.org/10.1007/s00024-021-02711-4

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