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| Titel |
Sub-ionospheric very low frequency perturbations associated with the 12 May 2008 M = 7.9 Wenchuan earthquake |
| VerfasserIn |
A. K. Maurya, R. Singh, B. Veenadhari, S. Kumar, A. K. Singh |
| 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 ; 13, no. 9 ; Nr. 13, no. 9 (2013-09-24), S.2331-2336 |
| Datensatznummer |
250085518
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| Publikation (Nr.) |
 copernicus.org/nhess-13-2331-2013.pdf |
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| Zusammenfassung |
| The present study reports the VLF (very low frequency) sub-ionospheric perturbations observed on
transmitter JJI (22.1 kHz), Japan, received at the Indian low-latitude
station, Allahabad ( geographic lat. 25.41° N, long 81.93° E),
due to Wenchuan earthquake (EQ) that occurred on 12 May 2008 with the
magnitude 7.9 and at the depth of 19 km in Sichuan province of Southwest
China, located at 31.0° N, 103.4° E. The nighttime amplitude
fluctuation analysis gives a significant increase in fluctuation and
dispersion two days before EQ, when it crosses 2σ criterion.
However, there was no significant change observed in the amplitude trend.
The diurnal amplitude variation shows a significant increase in the
amplitude of JJI signal on 11 and 12 May 2008. The gravity wave channel and
changes in the electric field associated with this EQ seem to be the
potential factors of the observed nighttime amplitude fluctuation,
dispersion, and significant increase in the signal strength. |
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