Abstract
It is long thought that the ionosphere is perturbed by seismic activities and these perturbations can be detected by probing the ionosphere with Very Low Frequency signal. We have analyzed the VLF phase data of NWC-IERC baseline in the year for 2011 and calculated the VLF day length using the sunrise and sunset terminator time in the phase. In this paper we present the cross correlation between VLF day-length and magnitude seismic activities. It is found that VLF day-length changed significantly before two days prior to the earthquakes.
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