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Analysis of the ultra-low frequency magnetic field fluctuations prior to the 2016 Kumamoto (Japan) earthquakes in terms of the method of critical fluctuations

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  • Potirakis, Stelios M.
  • Contoyiannis, Yiannis
  • Schekotov, Alexander
  • Asano, Tomokazu
  • Hayakawa, Masashi

Abstract

The method of critical fluctuations (MCF) is a time series analysis method which provides a way of both identifying the critical state and the departure from it. Its application to the ground-based ultra-low frequency (ULF) magnetic field fluctuations observed prior to the very strong earthquakes (EQs) of magnitudes MW=6.2, MW=6.0 and MW=7.0 which sequentially took place within a two days period (April 14–15, 2016) in Southwest Japan under the city of Kumamoto reveals when the underlying process reached critical state, as well as when it departed from critical state. Specifically, critical dynamics was identified in the raw total geomagnetic field intensity (F) ULF recordings of the Kanoya (Japan) station ∼4 d before the MW=6.2 and ∼5 d before the MW=7.0 event. Moreover, the progressive development of the symmetry breaking phenomenon, which signifies departure from critical state, was identified in later recordings. Specifically the phenomenon evolved from a few hours before the MW=6.0 event until a few hours after the occurrence of the specific EQ, which was a few hours before the MW=7.0 event. The detected combination of phenomena, i.e., the detection of critical state followed by the detection of the departure from the critical state by means of symmetry breaking, indicates that the main event was the third and strongest EQ, while the two preceding EQs were strong foreshocks.

Suggested Citation

  • Potirakis, Stelios M. & Contoyiannis, Yiannis & Schekotov, Alexander & Asano, Tomokazu & Hayakawa, Masashi, 2019. "Analysis of the ultra-low frequency magnetic field fluctuations prior to the 2016 Kumamoto (Japan) earthquakes in terms of the method of critical fluctuations," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 514(C), pages 563-572.
    • Handle: RePEc:eee:phsmap:v:514:y:2019:i:c:p:563-572
    DOI: 10.1016/j.physa.2018.09.070
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    References listed on IDEAS

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    1. Contoyiannis, Y. & Potirakis, S.M. & Eftaxias, K. & Hayakawa, M. & Schekotov, A., 2016. "Intermittent criticality revealed in ULF magnetic fields prior to the 11 March 2011 Tohoku earthquake (MW=9)," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 452(C), pages 19-28.
    2. Contoyiannis, Y.F. & Nomicos, C. & Kopanas, J. & Antonopoulos, G. & Contoyianni, L. & Eftaxias, K., 2010. "Critical features in electromagnetic anomalies detected prior to the L’Aquila earthquake," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 389(3), pages 499-508.
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    Cited by:

    1. D. Politis & S. M. Potirakis & M. Hayakawa, 2020. "Criticality analysis of 3-year-long VLF subionospheric propagation data possibly related to significant earthquake events in Japan," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 102(1), pages 47-66, May.

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