NHESS Natural Hazards and Earth System Sciences NHESS Nat. Hazards Earth Syst. Sci. 1684-9981 Copernicus Publications Göttingen, Germany 10.5194/nhess-4-669-2004 Magnitude and sign scaling in power-law correlated geoelectrical time series measured in southern Italy Telesca L. 1 Lapenna V. 1 Institute of Methodologies for Environmental Analysis, National Research Council, C.da S. Loja, 85050 Tito (PZ), Italy 01 11 2004 4 5/6 669 677 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://nhess.copernicus.org/articles/4/669/2004/nhess-4-669-2004.html The full text article is available as a PDF file from https://nhess.copernicus.org/articles/4/669/2004/nhess-4-669-2004.pdf

Recently, it has been proposed a new method to investigate the linear/nonlinear properties of a time series by decomposing it into two sub-series: magnitude and sign sub-series (Ashkenazy et al., 2003). The long-range correlation properties of the magnitude and sign sub-series relate to nonlinear and linear behavior of the original time series respectively. We apply this method to the hourly time variability of geoelectrical signals, measured from January 2001 to September 2002 by four stations installed in Basilicata region (southern Italy). Three stations (Giuliano, Marsico and Tito) are located in a seismic area, and one (Laterza) in a low-seismicity area. A site-dependence of the linear/nonlinear properties has been shown, revealing that different dynamics govern signals measured in seismic and low-seismicity areas.