Abstract
In this paper we investigate the ionospheric turbulence from TEC observations before and during the intense seismic activity of October of 2018 at Zakynthos area (λ = 20.51°E, φ = 37°34'N), (Main shock: ML 6.6, 60.6 km SW of Zakynthos). The Total Electron Content (TEC) data of 5 Global Positioning System (GPS) stations of the EUREF network, which are being provided by IONOLAB (Turkey), were analyzed using Discrete Fourier Analysis in order to investigate the TEC variations. The results of this investigation indicate that the High-Frequency limit fo, of the ionospheric turbulence band content, increases as the site and the moment of the earthquake occurrence are approaching, pointing to the earthquake locus. We conclude that the LAIC mechanism through acoustic or gravity wave could explain this phenomenology.
Highlights
It is generally accepted that the original cause of the earth surface perturbation is the increasing stress and the rapture of the rocks at the earthquake preparation area where radon release takes place
In this paper we investigate the ionospheric turbulence from Total Electron Content (TEC) observations before and during the intense seismic activity of October of 2018 at Zakynthos area (λ = 20.51 ̊E, φ = 37 ̊34'N), (Main shock: ML 6.6, 60.6 km SW of Zakynthos)
We conclude that the LAIC mechanism through acoustic or gravity wave could explain this phenomenology
Summary
It is generally accepted that the original cause of the earth surface perturbation is the increasing stress and the rapture of the rocks at the earthquake preparation area where radon release takes place. The coupling of radon with the atmosphere at the earth surface results in the increase of the Ionization, Temperature [1], Electromagnetic field and disturbances in the air electrical conductivity This perturbation is transmitted to the Ionosphere by some LAIC Mechanism. The inherent frequencies of the acoustic or gravity wave range between 0.003 Hz (period 5 min) and 0.0002 Hz (period 83 min), which according to Molchanov et al [9] [10] correspond to the frequencies of the turbulent produced by tectonic activity during the earthquake preparation period. During this propagation, the higher frequencies are progressively damped. The Total Electron Content (TEC) data of 5 Global Positioning System (GPS) stations of the EUREF network, which are being provided by IONOLAB (Turkey), were analyzed using Discrete Fourier Analysis in order to investigate the TEC variations [2] [3] [4]
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