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| Titel |
Decrease of VLF transmitter signal and Chorus-whistler waves before l'Aquila earthquake occurrence |
| VerfasserIn |
M. Y. Boudjada, K. Schwingenschuh, R. Döller, A. Rohznoi, M. Parrot, P. F. Biagi, P. H. M. Galopeau, M. Solovieva, O. Molchanov, H. K. Biernat, G. Stangl, H. Lammer, I. Moldovan, W. Voller, M. Ampferer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 10, no. 7 ; Nr. 10, no. 7 (2010-07-09), S.1487-1494 |
| Datensatznummer |
250008307
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| Publikation (Nr.) |
 copernicus.org/nhess-10-1487-2010.pdf |
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| Zusammenfassung |
| We investigate the VLF emissions observed by the Instrument Champ Electrique
(ICE) experiment onboard the DEMETER micro-satellite. We analyze intensity
level variation 10 days before and after the occurrence of l'Aquila
earthquake (EQ). We found a clear decrease of the VLF received signal related
to ionospheric whistler mode (mainly Chorus emission) and to signal
transmitted by the DFY VLF station in Germany, few days (more than one week)
before the earthquake. The VLF power spectral density decreases of more than
two orders of magnitude until the EQ, and it recovers to normal levels just
after the EQ occurrence. The geomagnetic activity is principally weak four
days before EQ and increases again one day before l'Aquila seismic event. Our
results are discussed in the frame of short- and long-terms earthquakes
prediction focusing on the crucial role of the magnetic field of the Earth. |
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