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Vertical Magnetic Field Diurnal as a Precursor to Earthquakes with Field Study in Parts of Western India
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Field studies carried out in parts of Western India in the area between latitudes 20°30" and 28°00"N during the years 1991 to 1995 show that VMF diurnal phase inversion attaining positive amplitude is invariably followed by earthquake occurrences within a few days in the region. These earthquakes are located in vicinity of the contact zone of Indian- Eurasian tectonic plates, Aravalli range, Delhi-Haridwar ridge and Western Ghat fault zone. Persistent prevalence of the diurnal phase fluctuation related to inversion-amplification-normal suggests that Western India is under strain due to tectonic forces acting upon it and, on exceeding the threshold limit of rocks, the stress energy is being released from time to time through geologically weak zones in form of tremorslearthquakes.
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