EGU2020-15760, updated on 12 Jun 2020
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Characterization of sub-ionospheric VLF/LF waveguides for seismic event studies during solar minimum

Hans Eichelberger1, Konrad Schwingenschuh1, Mohammed Y. Boudjada1, Bruno P. Besser1, Daniel Wolbang1, Alexander Rozhnoi2, Maria Solovieva2, Pier Francesco Biagi3, Manfred Stachel1, Özer Aydogar1, Cosima Muck1, Claudia Grill1, and Irmgard Jernej1
Hans Eichelberger et al.
  • 1Space Research Institute, Austrian Academy of Sciences, Graz, Austria (
  • 2Schmidt Institute of Physics of the Earth, RAS, Moscow, Russia
  • 3Department of Physics, University of Bari, Bari, Italy

In this study we present measurements and simulations of mid-latitude sub-ionospheric propagation paths between several VLF/LF transmitters and the Graz seismo-electromagnetic receiver facility (Schwingenschuh etal, 2011) during the current solar minimum condition. The upper D/E-region boundary of the waveguide is stable during the low solar activity in the years 2018 and 2019, i.e. measured VLF/LF amplitude and phase variations are mainly due to natural excitations from the lithosphere, atmosphere, and man-made disturbances. In particular, this period gives a baseline to characterize VLF amplitude and phase modulations in the waveguide cavity related to seismic activity over Europe. In addition, this opportunity let us probe the signal threshold and feed-back into waveguide simulation models. We conclude, proven long-term VLF/LF measurements, the continuous monitoring of the cavity, could be valuable in the assessment of seismic hazard scenarios.


Schwingenschuh, K., Prattes, G., Besser, B. P., Mocnik, K., Stachel, M., Aydogar, Ö., Jernej, I., Boudjada, M. Y., Stangl, G., Rozhnoi, A., Solovieva, M., Biagi, P. F., Hayakawa, M., and Eichelberger, H. U.: The Graz seismo-electromagnetic VLF facility, Nat. Hazards Earth Syst. Sci., 11, 1121–1127,, 2011.

How to cite: Eichelberger, H., Schwingenschuh, K., Boudjada, M. Y., Besser, B. P., Wolbang, D., Rozhnoi, A., Solovieva, M., Biagi, P. F., Stachel, M., Aydogar, Ö., Muck, C., Grill, C., and Jernej, I.: Characterization of sub-ionospheric VLF/LF waveguides for seismic event studies during solar minimum, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-15760,, 2020

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