Details of the abstract

Title of paper Near surface resistivity structure estimated from time domain electromagnetic data recorded along a profile in HFT Zone in Mohand area, Uttarakhand, India
List of authors M. Israil, Rehan Raza Ansari, M. Zubair, P. Yogeshwar, B. Tezkan
Affiliation(s) Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India, mohammad.israil@es.iitr.ac.in
Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India, ransari@es.iitr.ac.in
Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India, mzubair@es.iitr.ac.in
Institute of Geophysics and Meteorology, University of Cologne, Cologne, Germany,
pyogeshw@uni-koeln.de
Institute of Geophysics and Meteorology, University of Cologne, Cologne, Germany,
tezkan@geo.uni-koeln.de
Summary Time-domain electromagnetic (TDEM) data were recorded using Fast TEM device deployed in a coincidence loop geometry at 24 stations along a profile in the Himalayan Frontal Thrust (HFT) zone in Mohand area, Uttarakhand, India. The profile is approximately 1.6 km long and extends from the Indo-Gangetic plain in the south to the north of HFT in the Khajnawar Rao, a seasonal river bed. The processed data at each station was inverted using Occam and Marquardt inversion techniques to obtain 1D resistivity depth models at each station. A stacked geoelectrical section is generated along the profile from the inverted models. North and south-dipping beds are reflected on either side of the Mohand anticline thrust, passing nearly through the middle of the profile. Resistivity variations are interpreted in terms of the tectonics geometry of the fault zone, geological and geo-hydrological scenario of the area. A near-surface resistive layer (> 200 Ω-m) consisting of dry fluvial deposits, gravels, pebbles, and boulders of varying sizes can be seen throughout the profile. A very low resistivity (~ 10 Ω-m) is observed in the fault core zone. This zone is exposed along the river terrace zone on the west bank of Khajnawar Rao. The derived resistivity variations explain the geological and geo-hydrological scenario of the area and are consistent with the information available in the literature.
Session Keyword 2.0 Theory, Modelling and Inversion
File upload 2.0_near_surface_resistivity_israil.pdf
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