Articles | Volume 9, issue 6
Nat. Hazards Earth Syst. Sci., 9, 2063–2066, 2009
https://doi.org/10.5194/nhess-9-2063-2009
Nat. Hazards Earth Syst. Sci., 9, 2063–2066, 2009
https://doi.org/10.5194/nhess-9-2063-2009

  08 Dec 2009

08 Dec 2009

Time-clustering behavior in the sequence of the aftershocks of the Al-Hoceima (Morocco) 24 February 2004 earthquake

L. Telesca1, M. Rouai2, and T. E. Cherkaoui3 L. Telesca et al.
  • 1Istituto di Metodologie per l'Analisi Ambientale, CNR, Tito Scalo (PZ), Italy
  • 2Laboratory of Enginnering Geology, Faculty of Sciences, Meknes Universiy, P.O. Box 11201, Zitoune, Meknes, Morocco
  • 3Institut Scientifique, Mohamed V – Agdal University, Rabat, Morocco

Abstract. The time dynamics of the aftershock sequence of the Al-Hoceima (Morocco) earthquake of 24 February 2004 has been investigated. The sequence of the occurrence times of the events with threshold magnitude Mth≥3.2 is characterized by a time-clustering behavior, identified using different fractal methods (Fano Factor, Allan Factor, Count-based Periodogram), well suited to reveal scaling features in point processes. The obtained results not only show the presence of memory phenomena and correlation structures in the Al-Hoceima aftershocks, but also furnish quantitatively the estimate of the magnitude of such correlation by means of the estimate of the scaling exponent α.

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