Maurya, A.K. and Singh, R. and Veenadhari, B. and Kumar, Sushil and Singh, A.K. (2013) Sub - ionospheric very low frequency perturbations associated with the 12 May 2008 M = 7.9 Wenchuan earthquake. Natural Hazards and Earth System Science, 13 . pp. 2331-2336. ISSN 1561-8633
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Abstract
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.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Science, Technology and Environment (FSTE) > School of Engineering and Physics |
| Depositing User: | Ms Shalni Sanjana |
| Date Deposited: | 04 Oct 2013 02:05 |
| Last Modified: | 21 Mar 2017 21:45 |
| URI: | https://repository.usp.ac.fj/id/eprint/6896 |
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