On the Possibility of Precursors of Earthquake in Very Low Frequency (VLF) range observed by DEMETER Satellite
Abstract
We present Very Low Frequency (VLF) disturbances in the ionospheric electric field observed by DEMETER satellite prior to the three different earthquakes that occurred during the years 2008 - 2009. The electromagnetic wave data has been analyzed for 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. Our results indicate that the earthquake preparation process may disturb the ionospheric plasma and disturbances can reach the non-linear stage leading to the strong variations in the electromagnetic field and plasma parameters. The 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.
- Publication:
-
40th COSPAR Scientific Assembly
- Pub Date:
- 2014
- Bibcode:
- 2014cosp...40E3171S