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| Titel |
The ionospheric perturbations associated with Asian earthquakes as seen from the subionospheric propagation from NWC to Japanese stations |
| VerfasserIn |
Y. Kasahara, F. Muto, Y. Hobara, 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 ; 10, no. 3 ; Nr. 10, no. 3 (2010-03-26), S.581-588 |
| Datensatznummer |
250008014
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| Publikation (Nr.) |
 copernicus.org/nhess-10-581-2010.pdf |
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| Zusammenfassung |
| Huge five earthquakes with magnitude greater than 6.0 took place in Asia
(include Philippines, Indonesia, etc.) during the period from the beginning
of August 2008 to the end of Junuary 2009, and the corresponding data of
subionospheric VLF propagation between the NWC transmitter (Australia,
19.8 kHz) and a few Japanese stations (distance 6~8 Mm) are
examined. As the result of our analysis by means of (1) trend (average
nighttime amplitude), (2) dispersion, (3) nighttime fluctuation, and (4)
atmospheric gravity wave enhancement, three earthquakes from the five taking
place within the fifth Frenel zone are found to have accompanied a precursory
signature in VLF propagation. On the other hand, there were observed no such
precursory signatures for the remaing two earthquakes. One is too deep
(>400 km) and another is too distant from the great-circle path. These
characteristics of seismo-ionospheric perturbations would be of essential
importance in studying the spatial/temporal properties of seismo-ionospheric
perturbations for medium-distance propagation. |
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