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On the possibility of precursors ofearthquakes in VLF range observed by DEMETER Satellite

Sondhiya, D. K. and Kumar, Sushil and Gwal, A.K. (2014) On the possibility of precursors ofearthquakes in VLF range observed by DEMETER Satellite. Copernicus Publications, France.

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    Abstract

    Very Low Frequency (VLF) disturbances in the ionospheric electric field observed by DEMETER satellite prior to three different earthquakes that occurred during the years 2008–2009 have been presented. The electromagnetic wave data has been analyzed for 5 few days before the earthquake with special attention to the variation in spectral characteristics and non-linear effects using the statistical and wavelet based techniques. Results indicate that the earthquake preparation process may disturb the ionospheric plasma and these disturbances can reach the non-linear stage leading to the strong variations in the electromagnetic field and plasma parameters. The 10 enhancement in statistical parameters shows the coherent structure and intermittent phenomenon which is the signature of turbulence. The characteristics features of VLF disturbances have further been studied using the wavelet and bispectral analysis tools which provide useful information on the plasma turbulence.

    Item Type: Other
    Subjects: Q Science > QC Physics
    Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Engineering and Physics
    Depositing User: Sushil Kumar
    Date Deposited: 04 Jun 2015 15:09
    Last Modified: 26 May 2016 15:38
    URI: http://repository.usp.ac.fj/id/eprint/8313
    UNSPECIFIED

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