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| Titel |
Observation evidences of atmospheric Gravity Waves induced by seismic activity from analysis of subionospheric LF signal spectra |
| VerfasserIn |
A. Rozhnoi, M. Solovieva, O. Molchanov, P.-F. Biagi, M. Hayakawa |
| 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 ; 7, no. 5 ; Nr. 7, no. 5 (2007-10-26), S.625-628 |
| Datensatznummer |
250004738
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| Publikation (Nr.) |
 copernicus.org/nhess-7-625-2007.pdf |
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| Zusammenfassung |
| We analyze variations of the LF subionospheric signal amplitude and phase
from JJY transmitter in Japan (F=40 kHz) received in
Petropavlovsk-Kamchatsky station during seismically quiet and active periods
including also periods of magnetic storms. After 20 s averaging, the
frequency range of the analysis is 0.28–15 mHz that corresponds to the
period range from 1 to 60 min. Changes in spectra of the LF signal
perturbations are found several days before and after three large
earthquakes, which happened in November 2004 (M=7.1), August 2005 (M=7.2)
and November 2006 (M=8.2) inside the Fresnel zone of the Japan-Kamchatka
wavepath. Comparing the perturbed and background spectra we have found the
evident increase in spectral range 10–25 min that is in the compliance
with theoretical estimations on lithosphere-ionosphere coupling by the
Atmospheric Gravity Waves (T>6 min). Similar changes are not found
for the periods of magnetic storms. |
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