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
Received: 03 Aug 2009 – Accepted: 30 Sep 2009 – Published: 08 Dec 2009
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.
Telesca, L., Rouai, M., and Cherkaoui, T. E.: Time-clustering behavior in the sequence of the aftershocks of the Al-Hoceima (Morocco) 24 February 2004 earthquake, Nat. Hazards Earth Syst. Sci., 9, 2063-2066, doi:10.5194/nhess-9-2063-2009, 2009.