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In this paper we show, in terms of Fisher information and approximateentropy, that the two strong impulsive kHz electromagnetic (EM) bursts recorderprior to the Athens EQ (7 September 1999, magnitude 5.9) present compatibilityto the radar interferometry data and the seismic data analysis, which indicatethat two fault segments were activated during Athens EQ. The calculated Fisherinformation and approximate entropy content ratios closely follow the radarinterferometry result that the main fault segment was responsible for 80% ofthe total energy released, while the secondary fault segment for the remaining20%. This experimental finding, which appears for the first time in theliterature, further enhances the hypothesis for the seismogenic origin of theanalyzed kHz EM bursts.

Relation between seismicity and pre-earthquake electromagnetic emissions in terms of energy, information and entropy content