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arXiv · 0904.2465

Detrended fluctuation analysis of the magnetic and electric field variations that precede rupture

P. A. Varotsos·N. V. Sarlis·E. S. Skordas
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Abstract

Magnetic field variations are detected before rupture in the form of `spikes' of alternating sign. The distinction of these `spikes' from random noise is of major practical importance, since it is easier to conduct magnetic field measurements than electric field ones. Applying detrended fluctuation analysis (DFA), these `spikes' look to be random at short time-lags. On the other hand, long range correlations prevail at time-lags larger than the average time interval between consecutive `spikes' with a scaling exponent $α$ around 0.9. In addition, DFA is applied to recent preseismic electric field variations of long duration (several hours to a couple of days) and reveals a scale invariant feature with an exponent $α\approx 1$ over all scales available (around five orders of magnitude).

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P. A. Varotsos, N. V. Sarlis, E. S. Skordas. 2010-02-09. Detrended fluctuation analysis of the magnetic and electric field variations that precede rupture. https://doi.org/10.1063/1.3130931

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