Pre-seismic Electromagnetic Perturbations in Two Earthquakes in Northern Greece

  • K. Florios
  • I. Contopoulos
  • V. Christofilakis
  • G. Tatsis
  • S. Chronopoulos
  • C. Repapis
  • V. TritakisEmail author


Two medium-magnitude earthquakes separated by a distance of 230 km occurred within 34 days from each other in Northern Greece. A few hours before the manifestation of seismic activity, significant extra-low-frequency (ELF) perturbations were detected in a nearby Schumann resonance observation site. The typical spectrum of ELF measurements was deformed with the appearance of an enhanced spectral feature in the frequency range 20–25 Hz. A logit regression model was applied to the data to examine whether ELF perturbations could be considered as precursors of seismic activity. In general, two earthquakes so close to each other (in space, time, and magnitude) form a unique opportunity for the study of characteristic features of pre-seismic ultra-low-frequency (ULF)/ELF perturbations. Quantitative results from a simple nonlinear statistical model support the idea that there is some kind of physical interaction between seismic and atmospheric ELF activities, and that ELF measurements could potentially be used as a useful tool in the forecasting of seismic activity.


Schumann resonances earthquakes preseismic signals 



The authors express their gratitude to the Mariolopoulos-Kanaginis Foundation for the Environmental Sciences (grants nos. 119/20.04.2012 and 121/20.04.2016), and to the Empirikion Foundation for their generous support offered for the realization of this project. Warm thanks are also due to Mr. G. Skordos, ex-director of the high school at Doliana town, and the ecclesiastical committee of the same town for providing accommodation for personnel and equipment.


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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Research Center for Astronomy and Applied MathematicsAcademy of AthensAthensGreece
  2. 2.Mariolopoulos-Kanaginis Foundation for the Environmental SciencesAthensGreece
  3. 3.Department of MathematicsUniversity of AthensAthensGreece
  4. 4.Electronics-Telecommunications and Applications Lab, Physics DepartmentUniversity of IoanninaIoanninaGreece

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