Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Efficacy of Electrical Resistivity Tomography Technique in Mapping Shallow Subsurface Anomaly


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1 CSIR-National Geophysical Research Institute, Hyderabad - 500 007, India
     

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Electrical Resistivity Tomography is a versatile, fast and cost effective technique for mapping the shallow subsurface anomaly. It covers a wide spectrum of resistivity ranging from <1 Ohm.m to several thousands of Ohm.m. In this paper applications and utility of two-dimensional Electrical Resistivity Tomography (ERT) technique are discussed to look into huge data density coverage, different signal strengths of data from subsurface and their implications in resolving the aquifer zones, related geological structures etc. of the substratum ranging from alluvium to tectonically disturbed hard rock ridge region of the country. The major advantages and flexibility of ERT over conventional resistivity methods are also discussed.

Keywords

Electrical Resistivity Tomography, Subsurface Mapping, Groundwater Hydrology.
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  • IGGS Report on Resistivity Survey for sitting a borewell location for rain water harvesting in Hamdard University Campus, New Delhi submitted by IGIS Sarita Vihar New Delhi, 2001, 17p.

  • KUMAR, D., KRISHNAMURTHY, N.S., AHMED, S., JAIN, S.C. and DHAR, R.L. (2003) Mise-à-la-masse technique in establishing the lateral extension of fractures in hard rocks. Jour. Geol. Soc. India, v.61, pp.185-194.

  • KUMAR, D. (2004) Conceptualization and Optimal data Requirement in Simulating Flow in Weathered-Fractured Aquifers for Groundwater Management, Ph.D. Thesis, Osmania University, Hyderabad, 213p.

  • KUMAR, D., AHMED, S., KRISHNAMURTHY, N.S. and DEWANDEL, B. (2007) Reducing ambiguities in vertical electrical sounding interpretations: A geostatistical application. Jour. Appld. Geophys., v.62, pp.16-32.

  • MARECHAL, J.C., DEWANDEL, B. and SUBRAHMANYAM, K. (2004) Use of hydraulic tests at different scales to characterize fracture network properties in the weathered-fractured layer of a hard rock aquifer. Water Resour. Res., v.40, W11508, pp.1-17.

  • RAO, V.A., KUMAR, D., SARMA, V.S., KHAN, A.A. and AHMED, S. (2006) Multi-Electrode Resistivity Imaging Survey for Groundwater Exploration in Jamia Hamdard University Campus, New Delhi, Technical Report No. NGRI-2006-GW-578.

  • RAO, V. A., KUMAR, D., CHANDRA, S., NAGAIAH, E., KUMAR, G.A., ALI, SYED and AHMED, S. (2008) High-Resolution Electrical Resistivity Tomography (HERT) Survey for Groundwater Exploration at APSP Campus, Dichpally, Nizamabad District, Andhra Pradesh, Technical Report No. NGRI-2008-GW-626.


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  • Efficacy of Electrical Resistivity Tomography Technique in Mapping Shallow Subsurface Anomaly

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Authors

Dewashish Kumar
CSIR-National Geophysical Research Institute, Hyderabad - 500 007, India

Abstract


Electrical Resistivity Tomography is a versatile, fast and cost effective technique for mapping the shallow subsurface anomaly. It covers a wide spectrum of resistivity ranging from <1 Ohm.m to several thousands of Ohm.m. In this paper applications and utility of two-dimensional Electrical Resistivity Tomography (ERT) technique are discussed to look into huge data density coverage, different signal strengths of data from subsurface and their implications in resolving the aquifer zones, related geological structures etc. of the substratum ranging from alluvium to tectonically disturbed hard rock ridge region of the country. The major advantages and flexibility of ERT over conventional resistivity methods are also discussed.

Keywords


Electrical Resistivity Tomography, Subsurface Mapping, Groundwater Hydrology.

References