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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 4, issue 5/6
Nat. Hazards Earth Syst. Sci., 4, 691–695, 2004
https://doi.org/10.5194/nhess-4-691-2004
© Author(s) 2004. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Special issue: Precursory phenomena, seismic hazard evaluation and seismo-tectonic...

Nat. Hazards Earth Syst. Sci., 4, 691–695, 2004
https://doi.org/10.5194/nhess-4-691-2004
© Author(s) 2004. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  03 Nov 2004

03 Nov 2004

Information entropy analysis of seismicity of Umbria-Marche region (Central Italy)

L. Telesca, V. Lapenna, and M. Lovallo L. Telesca et al.
  • Institute of Methodologies for Environmental Analysis, National Research Council, Tito, Italy

Abstract. We investigated by means of nonlinear tools the temporal distribution of 1983-2003 seismicity of the Umbria-Marche region, Central Italy, that was struck by a strong event (M=5.8) on 26 September 1997. Information entropy analysis has been performed over the full and the aftershock-depleted catalogue. We analysed the series of the interevent times between successive earthquakes and the series of their magnitudes. The time evolution of this measure shows a clear anomalous behaviour in correspondence with the stronger event, more evident in the full catalogue than in the aftershock-depleted one.

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