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An Integrated geophysical approach i.emagnetic impedance(lps1200) and Audio magneto telluric(ADMT 300s) survey was carried out in hard rock area of Pathalapattai village, Thiruverambur Block in Tiruchirappalli District of Tamil Nadu State, India, for delineation of groundwater-bearing zones that would be feasible for drilling deep bore wells for tapping good quantum of water. Groundwater movement that moves through fractures in hard rocks,can be delineated byintegrated geophysical surveys. A detailed survey of the area was done using a LPS1200 instrument to target fractured zones by magnetic impedance variation and favorable locations were selected for further study using ADMT 300s (2D Audio Magneto Telluric Scanner). Hence, the entire area (1 acre of land) was surveyed and only two places was the favorable where the magnetic impedance difference was encouraging. Those anomalous areas were scanned by 2D Audio magneto telluric scanner up to the depth of 300m. The technique has provided information on the subsurface lithology & structures up to 300 m depth. The study shows that the groundwater occurrence in the area is confined to fractured and weathered zones. One of the location was recommended to drill a bore well. Comparing and correlating these results with the drilling data, it is found to be good. It can be concluded that the established interpretation of 2D Audio Magneto Telluric data and LPS 1200 data pretty well correlates with the actual fracture depth and lithological conditions. Thus, the method not only aids in locating water aquifers but also helps to avoid bore hole failures.
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