Articles | Volume 12, issue 5
Nat. Hazards Earth Syst. Sci., 12, 1267–1276, 2012
https://doi.org/10.5194/nhess-12-1267-2012
Nat. Hazards Earth Syst. Sci., 12, 1267–1276, 2012
https://doi.org/10.5194/nhess-12-1267-2012

Research article 04 May 2012

Research article | 04 May 2012

Investigating the time-scaling behavior of the 2004–2010 seismicity of Aswan area (Egypt) by means of the Allan factor statistics and the detrended fluctuation analysis

L. Telesca1, M. Lovallo2, A. E.-E. Amin Mohamed3, M. ElGabry3, S. El-hady3, K. M. Abou Elenean3, and R. ElShafey Fat ElBary4 L. Telesca et al.
  • 1Consiglio Nazionale delle Ricerche, Istituto di Metodologie per l'Analisi Ambientale, C.da S.Loja, 85050 Tito (PZ), Italy
  • 2Agenzia Regionale per la Protezione dell'Ambiente di Basilicata, 85100 Potenza, Italy
  • 3National Research Institute of Astronomy and Geophysics NRIAG, 11421 Helwan, Cairo, Egypt
  • 4Aswan Seismological Research Institute, Egypt

Abstract. The time dynamics of seismicity of Aswan area (Egypt) from 2004 to 2010 was investigated by means of the (i) Allan Factor, which is a powerful tool allowing the capture of time-clusterized properties of temporal point processes; and the (ii) detrended fluctuation analysis, which is capable of detecting scaling in nonstationary time series. The analysis was performed varying the depth and the magnitude thresholds. The 2004–2010 Aswan seismicity is characterized by significant three-fold time-clustering behaviors with scaling exponents ~0.77 for timescales between 104.16 s and 105.14 s, ~0.34 for timescales between 105.14 s and 106.53 s, and ~1 for higher timescales. The seismic interevent times and distances are characterized by persistent temporal fluctuations for most of the magnitude and depth thresholds.

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