Open Access

VHF-electromagnetic evidence of the underlying pre-seismic critical stage

  • Panayiotis Kapiris1,
  • John Polygiannakis1,
  • Athanassios Peratzakis1,
  • Konstantinos Nomicos2 and
  • Konstantinos Eftaxias1
Earth, Planets and Space201454:BF03352452

https://doi.org/10.1186/BF03352452

Received: 20 February 2002

Accepted: 26 November 2002

Published: 21 June 2014

Abstract

Based on the study of pre-seismic very high frequency (VHF) and very low frequency (VLF) electromagnetic signals, we attempt to establish a set of necessary conditions referring to the underlying critical stage of the earthquake preparation process. This study combines concepts from spectral analysis associated with critical point hypothesis, results from laboratory experiments of rupture and seismological arguments. These conditions are fully satisfied in the case of the VLF-VHF pre-seismic signals associated with the Kozani-Grevena earthquake in Greece.