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Statistical Features of the 2010 Beni-Ilmane, Algeria, Aftershock Sequence

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Abstract

The aftershock sequence of the 2010 Beni-Ilmane (M W 5.5) earthquake is studied in depth to analyze the spatial and temporal variability of seismicity parameters of the relationships modeling the sequence. The b value of the frequency–magnitude distribution is examined rigorously. A threshold magnitude of completeness equal to 2.1, using the maximum curvature procedure or the changing point algorithm, and a b value equal to 0.96 ± 0.03 have been obtained for the entire sequence. Two clusters have been identified and characterized by their faulting type, exhibiting b values equal to 0.99 ± 0.05 and 1.04 ± 0.05. Additionally, the temporal decay of the aftershock sequence was examined using a stochastic point process. The analysis was done through the restricted epidemic-type aftershock sequence (RETAS) stochastic model, which allows the possibility to recognize the prevailing clustering pattern of the relaxation process in the examined area. The analysis selected the epidemic-type aftershock sequence (ETAS) model to offer the most appropriate description of the temporal distribution, which presumes that all events in the sequence can cause secondary aftershocks. Finally, the fractal dimensions are estimated using the integral correlation. The obtained D 2 values are 2.15 ± 0.01, 2.23 ± 0.01 and 2.17 ± 0.02 for the entire sequence, and for the first and second cluster, respectively. An analysis of the temporal evolution of the fractal dimensions D −2, D 0, D 2 and the spectral slope has been also performed to derive and characterize the different clusters included in the sequence.

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Acknowledgements

The authors are grateful to the Editor Pr. A. Kijko for his helpful advice. We would like to thank Dr. S. D’Amico and an anonymous reviewer for their valuable comments and suggestions that greatly contributed to the improvement of the quality of the manuscript. The authors are also grateful to Dr. Beldjoudi from CRAAG, for providing the aftershock sequence file.

This research work was supported by the Algerian CRAAG, the Spanish Seismic Hazard and Active Tectonics research group, and the Spanish MINECO CGL2015-65602-R and CGL2016-80687-R projects.

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  1. Département Etudes et Surveillance Sismique, CRAAG, Bouzaréah, Algiers, Algeria

    M. Hamdache

  2. Department of Physics, University of Jaén, Jaén, Spain

    J. A. Peláez & J. Henares

  3. Faculty of Physics, Plovdiv University, Plovdiv, Bulgaria

    D. Gospodinov

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  1. M. Hamdache
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Hamdache, M., Peláez, J.A., Gospodinov, D. et al. Statistical Features of the 2010 Beni-Ilmane, Algeria, Aftershock Sequence. Pure Appl. Geophys. 175, 773–792 (2018). https://doi.org/10.1007/s00024-017-1708-6

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