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| Titel |
Effects on atmospherics at 6 kHz and 9 kHz recorded at Tripura during the India-Pakistan Border earthquake |
| VerfasserIn |
S. S. De, B. K. De, B. Bandyopadhyay, S. Paul, D. K. Haldar, A. Bhowmick, S. Barui, R. Ali |
| 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. 4 ; Nr. 10, no. 4 (2010-04-16), S.843-855 |
| Datensatznummer |
250008087
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| Publikation (Nr.) |
 copernicus.org/nhess-10-843-2010.pdf |
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| Zusammenfassung |
| The outcome of the results of some analyses of electromagnetic emissions
recorded by VLF receivers at 6 kHz and 9 kHz over Agartala, Tripura, the
North-Eastern state of India (Lat. 23° N, Long. 91.4° E) during
the large earthquake at Muzaffarabad (Lat. 34.53° N, Long. 73.58° E)
at Kashmir under Pakistan have been presented here. Spiky variations in
integrated field intensity of atmospherics (IFIA) at 6 and 9 kHz have been
observed 10 days prior (from midnight of 28 September 2005) to the day of
occurrence of the earthquake on 8 October 2005 and the effect continued,
decayed gradually and eventually ceased on 16 October 2005. The spikes
distinctly superimposed on the ambient level with mutual separation of 2–5 min.
Occurrence number of spikes per hour and total duration of their
occurrence have been found remarkably high on the day of occurrence of the
earthquake. The spike heights are higher at 6 kHz than at 9 kHz. The results
have been explained on the basis of generation of electromagnetic radiation
associated with fracture of rocks, their subsequent penetration into the
Earth's atmosphere and finally their propagation between Earth-ionosphere
waveguide. The present observation shows that VLF anomaly is well-confined
between 6 and 9 kHz. |
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