a Student, Department of Earth Sciences, IIT Roorkee, Uttarakhand, India, E-mail: skannaujiya@gmail.com b Professor, Department of Earth Sciences, IIT Roorkee, Uttarakhand, India, E-mail: mohdfes@iitr.ernet.in P-008 Determination of Geoelectric Strike and 2D inversion of Magnetotelluric Data from Himalayan Region Suresh Kannaujiya a, *, M Israil b , IIT Roorkee Summary Broadband magnetotelluric (MT) soundings have been applied to determine the deep electrical conductivity structure across Garhwal Himalaya corridor along the Deoband-Gangotri profile passing through major Himalayan thrusts: Himalayan Frontal Thrust (HFT), Main Boundary Thrust (MBT) and Main Central Thrust (MCT). The average Geoelectric Strike estimated for the 15 station MT data of Deoband-Gangotri profile along NE-SW was N75°W, and after that 2D smooth inversion was carried out for 15 station MT data. Where the near surface conductive feature in foothills and Siwalik Himalaya is relating to the molassic sediments transported from Higher Himalayan region. The strong lateral discontinuities along the profile are associated with the various thrust zones. The conducting zone near MCT is a typical example of presence of mid crustal conductor. Along this profile the mid crustal conducting zone near MCT coincides with the intense microseismic activity zone (Khattri, 1992). Then we have correlated this model with the geoelectrical model of Roorkee- Gangotri profile of Himalaya Region (Tyagi et al, 2007) and also with geoelectrical model along the central Nepal – Himalaya profile (Lemonier et al., 1999). Introduction The tectonics and geology along the profile (Deoband- Gangotri) has given below- Tectonics in the Himalayan foothills is a result of the active compressional forces since the collision between Indian and Eurasian plates and is best understood as a combination of thin skin tectonics and the basement level Faulting. Himalaya is a part of an arcuate orogenic belt extending over about 2500 km on the northern part of the Indian plate, resulting from a collision between the Indian and Eurasian plates. The tectonic setting of the Himalayan mountain belt can be described in terms of four prominent structural breaks (MFT, MBT, MCT, ITS) running along the entire length of the Himalayan strike. Siwaliks are the Late Tertiary foothills. After the seismicity studies, most of the subsequent subduction seems to be occurring along central thrust (MCT) and MBT (Gansser, 1977). Many thrusts and fold belts have been developed in this region as a result of the post-collision compressional forces, which were subsequently covered by various sedimentary deposits brought down by the rivers and streams in this vast mountain chain. The goal of this paper is to find out the electrical conductivity structure in Garhwal Himalaya corridor along the Deoband-Gangotri profile passing through major Himalayan thrusts: Himalayan Frontal Thrust (HFT), Main Boundary Thrust (MBT) and Main central thrust (MCT). The distance of the profile over the entire length of the Himalayan is 180km, and each the entire length of the Himalayan is 180km, and each approximately. Figure 1 The Locations of MT Sites in Garhwal Himalaya and thrust boundary (HFT (green color), MBT (blue color), MCT (pink color) showing between the station.