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| Titel |
On the possibility of precursors of earthquakes in VLF range observed by DEMETER Satellite |
| VerfasserIn |
D. K. Sondhiya, S. Kumar, A. K. Gwal |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2198-5634
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics Discussions ; 1, no. 1 ; Nr. 1, no. 1 (2014-05-19), S.977-997 |
| Datensatznummer |
250115099
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| Publikation (Nr.) |
 copernicus.org/npgd-1-977-2014.pdf |
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| Zusammenfassung |
| 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. |
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