Minima of the fluctuations of the order parameter of global seismicity

N.V. Sarlis; S-R. Christopoulos; E.S. Skordas

doi:10.1063/1.4922300

Minima of the fluctuations of the order parameter of global seismicity

N.V. Sarlis, S-R. Christopoulos, E.S. Skordas

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Abstract

It has been recently shown [N. V. Sarlis, Phys. Rev. E 84, 022101 (2011) and N. V. Sarlis and S.-R. G. Christopoulos, Chaos 22, 023123 (2012)] that earthquakes of magnitude M greater or equal to 7 are globally correlated. Such correlations were identified by studying the variance κ 1 of natural time which has been proposed as an order parameter for seismicity. Here, we study the fluctuations of this order parameter using the Global Centroid Moment Tensor catalog for a magnitude threshold Mthres = 5.0 and focus on its behavior before major earthquakes. Natural time analysis reveals that distinct minima of the fluctuations of the order parameter of seismicity appear within almost five and a half months on average before all major earthquakes of magnitude larger than 8.4. This phenomenon corroborates the recent finding [N. V. Sarlis et al., Proc. Natl. Acad. Sci. U.S.A. 110, 13734 (2013)] that similar minima of the seismicity order parameter fluctuations had preceded all major shallow earthquakes in Japan. Moreover, on the basis of these minima a statistically significant binary prediction method for earthquakes of magnitude larger than 8.4 with hit rate 100% and false alarm rate 6.67% is suggested.

Original language	English
Journal	Chaos
Volume	25
Issue number	Article number 063110
DOIs	https://doi.org/10.1063/1.4922300
Publication status	Published - Jun 2015

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Bibliographical note

Copyright 2015 AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Sarlis, N.V. , Christopoulos, S-R. and Skordas, E.S. (2015) Minima of the fluctuations of the order parameter of global seismicity. Chaos, volume 25 (Article number 063110) and may be found at http://dx.doi.org/10.1063/1.4922300 .

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Sarlis, N. V., Christopoulos, S-R., & Skordas, E. S. (2015). Minima of the fluctuations of the order parameter of global seismicity. Chaos, 25(Article number 063110). https://doi.org/10.1063/1.4922300

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author = "N.V. Sarlis and S-R. Christopoulos and E.S. Skordas",

note = "Copyright 2015 AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Sarlis, N.V. , Christopoulos, S-R. and Skordas, E.S. (2015) Minima of the fluctuations of the order parameter of global seismicity. Chaos, volume 25 (Article number 063110) and may be found at http://dx.doi.org/10.1063/1.4922300 .",

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AB - It has been recently shown [N. V. Sarlis, Phys. Rev. E 84, 022101 (2011) and N. V. Sarlis and S.-R. G. Christopoulos, Chaos 22, 023123 (2012)] that earthquakes of magnitude M greater or equal to 7 are globally correlated. Such correlations were identified by studying the variance κ 1 of natural time which has been proposed as an order parameter for seismicity. Here, we study the fluctuations of this order parameter using the Global Centroid Moment Tensor catalog for a magnitude threshold Mthres = 5.0 and focus on its behavior before major earthquakes. Natural time analysis reveals that distinct minima of the fluctuations of the order parameter of seismicity appear within almost five and a half months on average before all major earthquakes of magnitude larger than 8.4. This phenomenon corroborates the recent finding [N. V. Sarlis et al., Proc. Natl. Acad. Sci. U.S.A. 110, 13734 (2013)] that similar minima of the seismicity order parameter fluctuations had preceded all major shallow earthquakes in Japan. Moreover, on the basis of these minima a statistically significant binary prediction method for earthquakes of magnitude larger than 8.4 with hit rate 100% and false alarm rate 6.67% is suggested.

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