Time and space analysis of two earthquakes in the Appennines (Italy)
Michele Caputo, Giovanni Sebastiani
DOI: 10.4236/ns.2011.39101   PDF    HTML     6,340 Downloads   11,452 Views   Citations


In this paper, we study two earthquakes: the April 6th 2009 earthquake of L’Aquila in the region of Abruzzo (Italy) and the 1997 Colfiorito earthquake in the regions of Umbria and Marche (Italy). The data sets of these two earthquakes were analysed in both time and space domains. For time domain we used statistical methods and models both parametric and non-parametric. Concerning the space domain, we used Mathematical Morphology filters. The time domain analysis provides evidence of a possible correlation between seismic activities and the tides of the crust of the Earth. The results obtained show evidence that the daily number of earthquakes of the sequences proceeding and following the April 6th 2009 earthquake of L’Aquila and that of the sequence following the 1997 Colfiorito earthquake have a periodic component of occurrence with period of about 7 days. It seems that the maxima of this component occur at a position of the Moon with respect to the Earth and the Sun corresponding to approximately 3 days before the four main Moon phases. The space domain analysis indicates that the foreshock activity in both earthquakes is clustered and concentrated. Furthermore, in each of the two earthquakes the clusters are located at about 3 kilometers from the epicentre of the main shock.

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Caputo, M. and Sebastiani, G. (2011) Time and space analysis of two earthquakes in the Appennines (Italy). Natural Science, 3, 768-774. doi: 10.4236/ns.2011.39101.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Schuster, A. (1897) On lunar and solar periodicities of earthquakes. Proceedings of the Royal Society of London, 61, 455-465. doi:10.1098/rspl.1897.0060
[2] Schuster, A. (1905) The periodogram and its optical analogy. Proceedings of the Royal Society of London, 77, 136.
[3] Métivier, L., De Viron, O., Conrad, C.P., Renault, S. and Diament, M. (2009) Evidence of earthquake triggering by solid Earth tides. Earth and Planetary Science Letters, 278, 370-375.
[4] Atef, A.H., Liu, K.H. and Gao, S.S. (2009), Apparent weekly and daily earthquake periodicities in the Western United States. Bulletin of the Seismological Society of America, 99, 2273-2279. doi:10.1785/0120080217
[5] Caputo, M. (1981) Earthquake-induced ground accelerations. Nature, 291, 51-53. doi:10.1038/291051a0
[6] Caputo, M. (1977) A mechanical model for the statistics of earthquakes magnitude, moment and fault distribution, Bulletin of the Seismological Society of America, 67, 849- 861.
[7] Wallace, R.E. (1976) Source fractures patterns along St. Andreas fault; Proc. Cent. Tect. Processes of Fault System. In: Kovach, R.L. and Nur, A., Eds., Geol. Sect., Stanford University Press, Palo Alto, 13, 248-250.
[8] Jaynes, E.T. (1987) Bayesian spectrum and chirp analy- sis. In: Ray S.C. and Erickson, G.J., Eds., Maximum Entropy and Bayesian Spectral Analysis and Estimation Problems, D. Reidel, Dordrecht, 1-37.
[9] Caputo, M. and Postpischl, D. (1974) Contour mapping of seismic areas by numerical filtering and geological implications. Annali di Geofisica, 27, 619-639.
[10] Serra, J. (1982) Image analysis and mathematical mor- phology. Academic Press Inc., London.

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