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Entropy, Vol. 20, Pages 477: The Complexity Measures Associated with the Fluctuations of the Entropy in Natural Time before the Deadly México M8.2 Earthquake on 7 September 2017

Entropy, Vol. 20, Pages 477: The Complexity Measures Associated with the Fluctuations of the Entropy in Natural Time before the Deadly México M8.2 Earthquake on 7 September 2017

Entropy doi: 10.3390/e20060477

Authors: Alejandro Ramírez-Rojas Elsa Leticia Flores-Márquez Nicholas V. Sarlis Panayiotis A. Varotsos

We analyse seismicity during the 6-year period 2012–2017 in the new time domain termed natural time in the Chiapas region where the M8.2 earthquake occurred, Mexico’s largest earthquake in more than a century, in order to study the complexity measures associated with fluctuations of entropy as well as with entropy change under time reversal. We find that almost three months before the M8.2 earthquake, i.e., on 14 June 2017, the complexity measure associated with the fluctuations of entropy change under time reversal shows an abrupt increase, which, however, does not hold for the complexity measure associated with the fluctuations of entropy in forward time. On the same date, the entropy change under time reversal has been previously found to exhibit a minimum [Physica A 506, 625–634 (2018)]; we thus find here that this minimum is also accompanied by increased fluctuations of the entropy change under time reversal. In addition, we find a simultaneous increase of the Tsallis entropic index q.

Authors:   Ramírez-Rojas, Alejandro ; Flores-Márquez, Elsa Leticia; Sarlis, Nicholas V.; Varotsos, Panayiotis A.
Journal:   Entropy
Volume:   20
edition:   6
Year:   2018
Pages:   477
DOI:   10.3390/e20060477
Publication date:   20-Jun-2018
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