Entropy of seismic electric signals: Analysis in natural time under time-reversal

Abstract

Electric signals have been recently recorded at the Earth's surface with amplitudes appreciably larger than those hitherto reported. Their entropy in natural time is smaller than that, $S_u$, of a ``uniform'' distribution. The same holds for their entropy upon time-reversal. This behavior, as supported by numerical simulations in fBm time series and in an on-off intermittency model, stems from infinitely ranged long range temporal correlations and hence these signals are probably Seismic Electric Signals (critical dynamics). The entropy fluctuations are found to increase upon approaching bursting, which reminds the behavior identifying sudden cardiac death individuals when analysing their electrocardiograms.

7 pages, 4 figures, copy of the revised version submitted to Physical Review Letters on June 29,2005

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• Construction of Ito model for Geoelectrical Signals
• Negative activation volume for dielectric relaxation in hydrated rocks
• Dielectric properties of Granodiorite partially saturated with water and its correlation to the detection of seismic electric signals
• Self-diffusivity as a function of density and temperature in crystalline solids and compensating rules for self-diffusion parameters in Carbon - Subgroup crystals
• Pressure dependence of the dielectric loss in semi-conducting polypyrrole aged at room temperature
• A paradigm for developing earthquake probability forecasts based on geoelectric data