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

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

2005-10-24

arxiv.org/abs/physics/0510215v1

Physics

Geophysics

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

Scientific paper

10.1103/PhysRevE.73.031114

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.

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