@article{3181613,
    title = "Tsallis Entropy Index q and the Complexity Measure of Seismicity in
Natural Time under Time Reversal before the M9 Tohoku Earthquake in 2011",
    author = "Varotsos, Panayiotis A. and Sarlis, Nicholas V. and Skordas, Efthimios and S.",
    journal = "Entropy",
    year = "2018",
    volume = "20",
    number = "10",
    publisher = "MDPI",
    issn = "1099-4300",
    doi = "10.3390/e20100757",
    keywords = "earthquakes; natural time analysis; non-extensive statistical mechanics;
index q",
    abstract = "The observed earthquake scaling laws indicate the existence of phenomena
closely associated with the proximity of the system to a critical point.
Taking this view that earthquakes are critical phenomena (dynamic phase
transitions), here we investigate whether in this case the
Lifshitz-Slyozov-Wagner (LSW) theory for phase transitions showing that
the characteristic size of the minority phase droplets grows with time
as t(1/3) is applicable. To achieve this goal, we analyzed the Japanese
seismic data in a new time domain termed natural time and find that an
LSW behavior is actually obeyed by a precursory change of seismicity and
in particular by the fluctuations of the entropy change of seismicity
under time reversal before the Tohoku earthquake of magnitude 9.0 that
occurred on 11 March 2011 in Japan. Furthermore, the Tsallis entropic
index q is found to exhibit a precursory increase."
}