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| Titel |
Variations of VLF/LF signals observed on the ground and satellite during a seismic activity in Japan region in May–June 2008 |
| VerfasserIn |
A. Rozhnoi, M. Solovieva, O. Molchanov, P.-F. Biagi, M. Hayakawa, K. Schwingenschuh, M. Boudjada, M. Parrot |
| 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. 3 ; Nr. 10, no. 3 (2010-03-16), S.529-534 |
| Datensatznummer |
250008008
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| Publikation (Nr.) |
 copernicus.org/nhess-10-529-2010.pdf |
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| Zusammenfassung |
| Signals of two Japanese transmitters (22.2 kHz and 40 kHz) recorded on the
ground VLF/LF station in Petropavlovsk-Kamchatsky and on board the DEMETER
French satellite have been analyzed during a seismic activity in Japan in
May–June 2008. The period of analysis was from 18 April to 27 June. During
this time two rather large earthquakes occurred in the north part of Honshu
Island – 7 May (M=6.8) and 13 June (M=6.9). The ground and satellite
data were processed by a method based on the difference between the real
signal in nighttime and the model one. For ground observations a clear
decrease in both signals has been found several days before the first
earthquake. For the second earthquake anomalies were detected only in JJI
signal. The epicenters of earthquakes were in reliable reception zone of
40 kHz signal on board the DEMETER. Signal enhancement above the seismic
active region and significant signal intensity depletion in the magnetically
conjugate area has been found for satellite observation before the first
earthquake. Anomalies in satellite data coincide in time with those in the
ground-based observation. |
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