  In this paper we show, in terms of Fisher information and approximate
entropy, that the two strong impulsive kHz electromagnetic (EM) bursts recorder
prior to the Athens EQ (7 September 1999, magnitude 5.9) present compatibility
to the radar interferometry data and the seismic data analysis, which indicate
that two fault segments were activated during Athens EQ. The calculated Fisher
information and approximate entropy content ratios closely follow the radar
interferometry result that the main fault segment was responsible for 80% of
the total energy released, while the secondary fault segment for the remaining
20%. This experimental finding, which appears for the first time in the
literature, further enhances the hypothesis for the seismogenic origin of the
analyzed kHz EM bursts.
