On the possibility of precursors of earthquakes in VLF range observed by DEMETER Satellite
D. K. Sondhiya1, S. Kumar2, and A. K. Gwal11Space Science Laboratory, Department of Physics, Barkatullah University, Bhopal-462026, India 2School of Engineering and Physics, The University of the South Pacific, Suva, Fiji
Received: 27 Mar 2014 – Accepted for review: 24 Apr 2014 – Discussion started: 19 May 2014
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 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 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.
Sondhiya, D. K., Kumar, S., and Gwal, A. K.: On the possibility of precursors of earthquakes in VLF range observed by DEMETER Satellite, Nonlin. Processes Geophys. Discuss., 1, 977-997, doi:10.5194/npgd-1-977-2014, 2014.