Stochastic behaviour and scaling laws in geoelectrical signals measured in a seismic area of southern Italy

Details Stochastic behaviour and scaling laws in geoelectrical signals measured in a seismic area of southern Italy Stochastic behaviour and scaling laws in geoelectrical signals measured in a seismic area of southern Italy

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999geoji.139..889c&link_type=abstract

Geophysical Journal International, Volume 139, Issue 3, pp. 889-894.

Astronomy and Astrophysics

Astronomy

6

Electromagnetism, Fractals, Spectral Analysis, Statistical Methods

Scientific paper

We explore the inner dynamics of daily geoelectrical time series measured in a seismic area of the southern Apennine chain (southern Italy). Autoregressive models and the Higuchi fractal method are applied to extract maximum quantitative information about the time dynamics from these geoelectrical signals. First, the predictability of the geoelectrical measurements is investigated using autoregressive models. The procedure is based on two forecasting approaches: the global and the local autoregressive approximations. The first views the data as a realization of a linear stochastic process, whereas the second considers the data points as a realization of a deterministic process, which may be non-linear. Comparison of the predictive skills of the two techniques allows discrimination between low-dimensional chaos and stochastic dynamics. Our findings suggest that the physical systems governing electrical phenomena are characterized by a very large number of degrees of freedom and can be described only with statistical laws. Second, we investigate the stochastic properties of the same geoelectrical signals, searching for scaling laws in the power spectrum. The spectrum fits a power law P(f)~f-α, with the scaling exponent α a typical fingerprint of fractional Brownian processes. In this analysis we apply the Higuchi method, which gives a linear relationship between the fractal dimension DΣ and the spectral power law scaling index α: DΣ=(3-α)/2. This analysis highlights the stochastic nature of geoelectrical signals recorded in this seismic area of southern Italy.

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