Electric and magnetic pulses are measured shortly (some minutes) before earthquakes. These pulses differ greatly from the seismic electric signals, which have appreciably longer lead times (days to months). In the case of 1995 Grevena-Kozani earthquake with a magnitude of 6.8, the time difference of ≈1s was observed between the recordings of the electric and magnetic components at Ioannina station, providing further support that the pulses were not from local man-made source but most probably from the epicentral area about 100km away. A tentative explanation of the phenomenon is proposed considering what happens in the very last stage before the earthquake occurrence.
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Varotsos et al. (2007) studied this question.
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