EGU21-7659, updated on 04 Mar 2021
https://doi.org/10.5194/egusphere-egu21-7659
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Ray paths of VLF/LF transmitter radio signals in the seismic Adriatic regions

Mohammed Y. Boudjada1, Hans Ulrich Eichelberger1, Pier Francesco Biagi2, Konrad Schwingenschuh1, Giovanni Nico3, Maria Solovieva4, Anita Ermini5, Iren Adelina Moldovan6, Michael E. Contadakis7, Aleksandra Nina8, Konstantinos Katzis9, Mourad Bezzeghoud10, Helmut Lammer1, Patrick H.M. Galopeau11, Bruno Besser1, and Özer Aydogar1
Mohammed Y. Boudjada et al.
  • 1Institut für Weltraumforschung, Extraterrestrial Physics, Graz, Austria (mohammed.boudjada@oeaw.ac.at)
  • 2Department of Physics, University of Bari, Bari, Italy
  • 3Institute for Applied Mathematics (IAC), National Research Council of Italy (CNR), Bari, Italy
  • 4Institute of the Earth Physics, RAS, Moscow, Russia
  • 5Department of Industrial Engineering, University of Tor Vergata, Rome, Italy
  • 6National Institute of Earth’s Physics, Seismological Department, Bucharest, Romania
  • 7Department of Surveying & Geodesy, University of Thessaloniki, Thessaloniki, Greece
  • 8Institute of Physics Belgrade, University of Belgrade, Belgrade, Serbia
  • 9Department of Computer Science and Engineering, European University Cyprus, Nicosia, Cyprus
  • 10Geophysical Centre of Évora and Physics Department, ECT, University of Évora, Évora, Portugal
  • 11LATMOS-CNRS, Université Versailles Saint-Quentin-en-Yvelines, Guyancourt, France

We analyze the radio wave propagations of VLF/LF transmitter signals along subionospheric paths using two different reception systems localized in the Graz seismo-electromagnetic facility (15.43E,47.06N). Those systems allow the simultaneous detection of more than fifteen transmitter signals emitting in the northern (i.e. France, Germany and United Kingdom) and southern (i.e. Italy and Turkey) parts of Europe. In this work, we investigate the transmitter radio wave propagations associated with two earthquakes (EQs) which occurred, at two occasions, in nearly the same Croatian regions (Geo. Long.=16°E; Geo. Lat.=45°N). The first and second EQs happened, respectively, on March 22 and December 29, 2020, with magnitudes Mw equal to 5.4 and 6.4. The use of two complementary reception systems, i.e. INFREP (Biagi et al., Open Journal of Earthquake Research, 8, 2019) and UltraMSK (Schwingenschuh et al., Nat. Hazards Earth Syst. Sci., 11, 2011), and the proximity to the epicenters lead us to characterize the behavior of the transmitter signal amplitudes particularly above the Croatian seismic regions. We analyze the amplitude variation for a given transmitter frequency starting few weeks before the earthquakes occurrences. We discuss the observed anomalies in the transmitter signals which may be considered as precursors due to the ionospheric disturbances of the transmitter ray paths above the earthquakes preparation zones. 

How to cite: Boudjada, M. Y., Eichelberger, H. U., Biagi, P. F., Schwingenschuh, K., Nico, G., Solovieva, M., Ermini, A., Moldovan, I. A., Contadakis, M. E., Nina, A., Katzis, K., Bezzeghoud, M., Lammer, H., Galopeau, P. H. M., Besser, B., and Aydogar, Ö.: Ray paths of VLF/LF transmitter radio signals in the seismic Adriatic regions, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-7659, https://doi.org/10.5194/egusphere-egu21-7659, 2021.

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