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To investigate the precursory signature of earthquakes on low frequency (LF) signal propagation, six earthquakes, having magnitude greater than equal to 6.5 and depth less than equal to 30km, are being studied. The base line level of 40kHz signal, transmitted from JJY station, Japan, is analysed with respect to Vd statistical parameter. Results show that the Vd parameter values starts fluctuating...
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