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 03:09 |
| Last Modified: | 26 May 2016 03:38 |
| URI: | https://repository.usp.ac.fj/id/eprint/8313 |
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