Ionospheric turbulence from TEC variations and VLF/LF transmitter signal observations before and during the destructive seismic activity of August and October 2016 in Central Italy

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Michael E. Contadakis
Demetrios N. Arabelos
https://orcid.org/0000-0001-7350-9498
George N. Vergos
Christos Skeberis
Tomas D. Xenos
Pierfrancesco Biagi
Emmanuel M. Scordilis

Abstract

In this paper we investigate the ionospheric turbulence from observations of TEC variations as well as from VLF/LF transmitter signal observations before and during the disastrous seismic activity of August and October 2016 in Central Italy. The Total Electron Content (TEC) data of 8 Global Positioning System (GPS) stations of the EUREF network, which are being provided by IONOLAB (Turkey), were analysed using Discrete Fourier Analysis in order to investigate the TEC variations. The data acquired for VLF/LF signal observations are from the receiver of Thessaloniki (40.59N, 22,78E), Greece, which monitor the VLF/LF transmitters of the International Network for Frontier Research on Earthquake Precursors (INFREP). A method of normalization according to the distance between the receiver and the transmitter is applied on the above data and then they are processed by the Hilbert Huang Transform (HHT) to produce the corresponding spectra for visual analysis. The results of both methods indicate that the High- Frequency limit fo, of the ionospheric turbulence content, increases as the site and the moment of the earthquake occurrence is approaching, pointing to the earthquake locus.

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How to Cite
1.
Contadakis ME, Arabelos DN, Vergos GN, Skeberis C, Xenos TD, Biagi P, Scordilis EM. Ionospheric turbulence from TEC variations and VLF/LF transmitter signal observations before and during the destructive seismic activity of August and October 2016 in Central Italy. Ann. Geophys. [Internet]. 2020Nov.3 [cited 2021Jun.12];63(5):PA546. Available from: https://www.annalsofgeophysics.eu/index.php/annals/article/view/7832
Section
Advances in multi-parametric, time-Dependent Assessment of Seismic Hazard and Earthquakes Forecast
Author Biography

Michael E. Contadakis, Department of Geodesy and Surveying,Aristotle University of Thessaloniki,Greece

Professor

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