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It has recently been found that the evolution of the preparation of a strongearthquake (EQ), as it is monitored through fracture-induced electromagneticemissions (EME) in the MHz band, presents striking similarity with theevolution of a thermal system as temperature drops, since distinct steps of theevolution of the phenomenon of spontaneous symmetry breaking (SSB) can beidentified. Here, the study of fracture-induced EME in the MHz band in analogyto thermal systems is extended to the phase of local fracture structures thatfollow after the SSB (and the occurrence of the main EQ). By comparingfracture-induced MHz EME associated with the strongest EQs (Mw=6.9) thatoccurred in Greece during the last twenty years with the 3D Ising model, a wayto distinguish whether a possible identification of post-SSB power-lawsimmediately after a very strong EQ is a sign for the preparation of a newstrong EQ or not is provided. In the suggested approach, the time seriesanalysis method known as the method of critical fluctuations is used, enhancedby the autocorrelation function, while the role of the latter proves to bedecisive.

Post-spontaneous-symmetry-breaking power-laws after a very strong earthquake: Indication for the preparation of a new strong earthquake or not?