The term subsurface cavity is used to refer to all subsurface features that are termed as goaf, caves, caverns, tunnels, mines, abandon gallery. Subsurface cavity can be water filled or air-filled rock debries. Subsurface cavities may occur naturally or due to manmade activity. Therefore, it is necessary to determine their location and size in order to evaluate the risk of subsidence and to draw up plans for restoration and safety. Electrical Resistivity Tomography (ERT) is an advanced geophysical method used to map the subsurface resistivity distribution by making simultaneous potential measurements across the multielectrodes inserted in the ground surface. It has three main units’ viz., transmitter, receiver and microprocessor. The resistance of layered earth is automatically calculated using inbuilt microprocessor which display and write in digital form. In the this study, 2D ERT sections have been generated along a profile over Sidpoki colliery, Jharia coalfield, India using Wenner, Schlumberger, Dipole-Dipole, Gradient arrays and joint inversion inversion of all array data collected by a state-of-the-art 61-channel 64 electrode FlashRES-Universal electrical resistivity tomography (ERT) data acquisition system. The present study reveals that different resistive anomalous features delineated using joint inversion gives best suitable results for delineation of relatively high resistivity voids.


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