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Magnetotelluric studies in northwestern Himalaya



Magnetotelluric studies in northwestern Himalaya



Current Trends in Geology 15, Part 3(Pages 47-60



This paper describes the theoretical principles underlying the magnetotelluric technique with two case studies from the seismically active regions in the northwestern Himalaya. Magnetotelluric studies in the Siwalik sediments have delineated about 5 km thick sedimentary sequences in the Mohand-Ramnagar region in the foothills of the Himalayas. Two layers of Siwalik sediments were observed underlying the alluvium. The Upper Siwaliks were resistive (30-200 U-m) and had a thickness of 700-1000 m whereas; the Middle and Lower Siwaliks were 3000-4000 m thick and had a resistivity of 9-15 U-m. These studies could not differentiate between the Middle and Lower Siwaliks, presumably because both these sequences have similar resistivities. A deep crustal conductive intrusive was delineated below the central part of the profile between Gendikhata and Saneh near Kotdwar. Magnetotelluric studies over the Pang-Phobrang profile indicated a high resistive crust. A vertical conductive feature was delineated on the south of Tso Morari crystallines. A vertical conductive feature at shallow depths separates the Tso Moraris from the Ladakh batholith on the NE. A fault zone was delineated below the stations Lukung and Phobrang.

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