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Journal of Seismology

, Volume 22, Issue 6, pp 1499–1513 | Cite as

Earthquake precursory signatures in electromagnetic radiation measurements in terms of day-to-day fractal spectral exponent variation: analysis of the eastern Aegean 13/04/2017–20/07/2017 seismic activity

  • Demetrios Cantzos
  • Dimitrios Nikolopoulos
  • Ermioni Petraki
  • Panayotis Yannakopoulos
  • Constantinos Nomicos
ORIGINAL ARTICLE
  • 43 Downloads

Abstract

The recent seismic activity in the eastern Aegean Sea, foregrounded by two major (ML = 6.1 and ML = 6.2) earthquakes occurring near Lesvos and Kos islands, respectively, is investigated in this work. Electromagnetic radiation measurements across different frequency bands and antenna orientations from a monitoring station in Agia Paraskevi, Lesvos Island, are analysed in order to reveal earthquake precursory signatures hidden in the electromagnetic data sequence. A straightforward, data-driven approach is employed in which day-to-day variations of the fractal characteristics of the measurements are adaptively monitored via a fractal spectral exponent similarity measure. The evolution of the fractal day-to-day variation in a 99-day period, which includes the two major earthquakes, shows a sustained, sudden increase lasting 1 to 4 days before every earthquake cluster of ML = 4.0 and above. Most importantly, this day-to-day variation subsides shortly after and remains relatively low during the absence of earthquakes, thus alleviating the emergence of false alarms.

Keywords

Earthquake precursors Remote sensing Radiation monitoring Fractal analysis 

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Department of Automation EngineeringPiraeus University of Applied SciencesAigaleoGreece
  2. 2.Department of Electronic Computer Systems EngineeringPiraeus University of Applied SciencesAigaleoGreece
  3. 3.Department of Electronic EngineeringTEI of AthensAigaleoGreece

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