On the Diurnal Dependence of fbEs-Variations Due to Earthquakes - International Journal of Geosciences

IJG > Vol.6 No.7, July 2015

On the Diurnal Dependence of f_bE_s-Variations Due to Earthquakes ()

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DOI: 10.4236/ijg.2015.67053 3,541 Downloads 4,185 Views Citations

Author(s)

Elena V. Liperovskaya¹, Claudia-Veronika Meister^2,3, Dieter H. H. Hoffmann^2,3, Alexandra S. Silina¹, Natalia E. Vasil’eva¹

Affiliation(s)

¹Institute of Physics of the Earth of the Russian Academy of Sciences, Moscow, Russia.
²Institut für Kernphysik, Technische Universitat Darmstadt, Darmstadt, Germany.
³Graduate School of Excellence Energy Science and Engineering, Darmstadt, Germany.

ABSTRACT

In the present work, disturbances of the half-transparency frequency f_bE_s of the ionospheric sporadic E-layer are investigated in connection with earthquakes. The f_bE_s-frequency is proportional to the square root of the maximum ionisation density of the sporadic E-layer. In this work, it is shown that in 2/3 of the cases, two days before a seismic shock with magnitude M > 5.5 and on the day of the shock, an increase of the f_bE_s-frequency is obtained at sunset hours at distances from the epicenter R < exp (M) km. In contrast, before sunrise, the f_bE_s-value decreases. The data analysed are obtained by the three vertical ionospheric sounding stations“Kokubunji”, “Yamagawa”, and “Wakkanai” during some tens of years.

KEYWORDS

Earthquake Precursors, Ionosphere, Sporadic E-Layer, Half-Transparency Frequency, Earthquake Preparation Region, Solar Influence on E-Layer, Geomagnetic Influence on E-Layer

Share and Cite:

Liperovskaya, E. , Meister, C. , Hoffmann, D. , Silina, A. and Vasil’eva, N. (2015) On the Diurnal Dependence of f_bE_s-Variations Due to Earthquakes. International Journal of Geosciences, 6, 656-665. doi: 10.4236/ijg.2015.67053.

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