NPG Nonlinear Processes in Geophysics NPG Nonlin. Processes Geophys. 1607-7946 Copernicus Publications Göttingen, Germany 10.5194/npg-11-545-2004 Investigating the spatial variability of the time-scaling properties in Italian seismicity Telesca L. 1 Lapenna V. 1 Institute of Methodologies for Environmental Analysis, National Research Council, Tito Scalo (PZ), Italy 16 11 2004 11 5/6 545 552 Copyright: © 2004 L. Telesca 2004 This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Generic License. To view a copy of this licence, visit https://creativecommons.org/licenses/by-nc-sa/2.5/ This article is available from https://npg.copernicus.org/articles/11/545/2004/npg-11-545-2004.html The full text article is available as a PDF file from https://npg.copernicus.org/articles/11/545/2004/npg-11-545-2004.pdf

Significant power-law long-range correlated structures have been identified in the Italian seismicity from 1983 to 2003. We performed the Allan Factor Analysis and the Detrended Fluctuation Analysis on both the full and the aftershock-depleted seismic data, extracted by the INGV (National Institute of Geophysics and Volcanology) instrumental catalog.Our findings suggest that (i) the time-scaling behaviour characterizes mainly the Apennine chain; (ii) the time-correlated behaviour of the seismicity is persistent, and this implies that the dynamics underlying the seismic phenomenology is characterized by the presence of "positive feedback mechanisms"; (iii) significant time correlation is not simply related with the mainshock/aftershock mechanisms.