Delineation of Subsurface Geological Formations using Electrical Resistivity Methods in Ongur River Sub Basin, Tamil Nadu, India

The application of Geophysical Electrical Resistivity methods by means of Vertical Electrical Soundings for deciphering the subsurface characteristics of Hard rock terrains has been attempted in the Ongur River Sub Basin, Tamil Nadu. 77 Vertical Electrical Sounding (VES) were conducted at regular station intervals. The VES data were interpreted by Curve Matching Technique using Standard Master Curves as well as ‘IPI2Win' software. The interpreted VES results coupled with Hydro geological data have been used to delineate subsurface geological formations and ground water potential zone, which will help in identifying areas suitable for groundwater management in Hard rock terrains.