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IJRSP Vol.38(4) [August 2009] >

Title: Subsurface VLF electric field emissions associated with regional earthquakes
Authors: Singh, Raj Pal
Kumar, Manoj
Singh, O P
Singh, Birbal
Keywords: Earthquake
VLF electric field emissions
Borehole antenna
Issue Date: Aug-2009
Publisher: CSIR
Abstract:  A borehole antenna has been installed at Agra (latitude 27.2oN, longitude 78oE), India since 01 June 2006. The subsurface very low frequency (VLF) electric field emissions (f = 3.042 kHz) data has been recorded round the clock for a period of nineteen months from 01 June 2006 to 31 December 2007. This statistical analysis of data is presented in the paper. The occasional amplitude enhancement is observed in the data and examined in the light of magnetic storms, earthquakes, and lightning activities. It is found that in majority of the cases, amplitude anomalies are correlated with moderate seismic activities occurred during the period in the region. The propagation mechanism of VLF signals from the hypocenters of earthquakes to the observing station is discussed in the paper.
Page(s): 220-226
ISSN: 0975-105X (Online); 0367-8393 (Print)
Source:IJRSP Vol.38(4) [August 2009]

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