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| Titel |
Investigation of VLF and HF waves showing seismo-ionospheric anomalies induced by the 29 September 2009 Samoa earthquake (Mw=8.1) |
| VerfasserIn |
M. Akhoondzadeh, M. Parrot, M. R. Saradjian |
| 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. 5 ; Nr. 10, no. 5 (2010-05-28), S.1061-1067 |
| Datensatznummer |
250008156
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| Publikation (Nr.) |
 copernicus.org/nhess-10-1061-2010.pdf |
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| Zusammenfassung |
| In Samoa Islands, a powerful earthquake took place at 17:48:10.99 UTC
(06:48:10.99 LT) on 29 September 2009 with a magnitude Mw=8.1.
Using ICE (Instrument Champ Electrique) and IMSC (Instrument Magnetic Search
Coil) experiments onboard the DEMETER (Detection of Electromagnetic Emissions
Transmitted from Earthquake Regions) satellite we have surveyed possible
variations in electromagnetic signals transmitted by the ground-based VLF
transmitter NPM in Hawaii and in HF plasma waves close to the Samoa
earthquake during the seismic activity. The indices Dst and Kp were used to distinguish pre-earthquake anomalies from the other
anomalies related to the geomagnetic activities. In a previous study we have
shown that anomalies in IAP (plasma analyzer) and ISL (Langmuir probe)
experiments onboard the DEMETER and also TEC (Total Electron Content) data
appear 1 to 5 days before the Samoa earthquake. In this paper we show that
the anomalies in the VLF transmitter signal and in the HF range appear with
the same time scale. The lack of significant geomagnetic activities indicates
that these anomalous behaviors could be regarded as seismo-ionospheric
precursors. It is also shown that comparative analysis is more effective in
seismo-ionospheric studies. |
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