Abstract
An integrated geophysical investigation using very low frequency electromagnetic (VLF-EM) and electrical resistivity methods has been carried out for detection of groundwater bearing fracture zones in hard rock area of Sangod Block, Kota District, Rajasthan. A total of seven VLF-EM profiles and three vertical electrical soundings have been carried out to identify the fracture zones to locate the possible borehole positions for meeting the demand of drinking and irrigation water supply in the area. The interpretation of VLF-EM data is carried out qualitatively using Fraser and Karous-Hjelt filters and the interpretation of sounding data is done using IPI2win software. The interpretation of VLF-EM data usually represents the appropriate fracture zones based on higher values of relative apparent current density that correspond to the subsurface fracture. The results of the study showed the presence of fracture zones which are prominently oriented in the NE-SW and NW-SE direction. The results also showed that most of the fracture zones are located at a depth range of 10–30 m within the subsurface. The vertical electrical sounding data are collected at suitable locations corresponding to subsurface fracture zones, identified on basis of VLF data. The interpretation of VES data also suggest subsurface fracture zone at these locations. The VLF-EM and VES at suitable locations along the VLF profile suggest the existence of fracture zones in part of Sangod Block of Kota district which indicate that the study area has good prospects for groundwater. Therefore, on basis of this study the drilling of productive boreholes are recommended at sounding locations VES 3 along the VLF profile P2 at depth range of 10–20 m, VES 1 along the VLF profile P5 at depth range of 10–40 m and VES 2 along the VLF profile P7 at depth range of 5–20 m.
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