Long-range correlations in the electric signals that precede rupture: further investigations.

  title={Long-range correlations in the electric signals that precede rupture: further investigations.},
  author={Panayiotis A. Varotsos and Nicholas V. Sarlis and Efthimios S. Skordas},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  volume={67 2 Pt 1},
The correlations within the time series of the seismic electric signal (SES) activities have been studied in a previous paper [P. Varotsos, N. Sarlis, and E. Skordas, Phys. Rev. E 66, 011902 (2002)]. Here, we analyze the time series of successive high- and low-level states' durations. The existence of correlation between the states is investigated by means of Hurst and detrended fluctuation analysis (DFA). The multifractal DFA (MF-DFA) is also employed. The results point to a stronger… 

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