Assam region lies in the tectonic region of eastern Himalayas and flood plains of River Brahmaputra. The landscape of Assam is formed by the complex integration of the vertical and horizontal movement of the earth’s crust and the depositional and erosional process by a river. The frequency of seismic events results in the deformation of landforms and it highly influences the drainage pattern of the area. The analysis of tectonic or neotectonic activity with the help of morphometric parameters and geomorphic indices helps in the identification of hazard-prone areas of the basin. In the present study, the active tectonics of the Assam region is assessed using SRTM DEM data of 30 m resolution to derive linear and aerial morphometric parameters and eight geomorphic indices of the selected ten basins. The morphometric parameters and geomorphic indices namely, stream length gradient (Sl), valley floor width to height ratio (Vfh), hypsometric curve, hypsometric integral (Hi), asymmetric factor (Af), basin shape index (BS), transverse topographic symmetry (T), basin elongation ratio (BE) and stream sinuosity (SS) are calculated for each basin. With the help of GIS, the indices are classified into three tectonic activity classes i.e., from higher to lower and the average of the classes are combined to generate an index of relative active tectonics (IRAT). The four classes of IRAT are defined for the study area as i) very high; Class 1 (1.57 – 1.80), ii) high; Class 2 (1.81 – 2.06), moderate; Class 3 (2.07 – 2.26) and low; Class 4 (2.27 – 2.30). Class 1 of IRAT corresponds to Basin 1 and 6 with a total area of about 47740 km2, basin 2, 4 and 5 falls under Class 2 of IRAT and its total area is 2507 km2, class 3 covers a total area of 17495 km2 of basin 7,8 and 9 and Class 4 IRAT consists of basin 3 and 10 of total area 2090 km2. Results show that the majority of the study area lies in very high to moderate active tectonic zones and these zones are consistent with the presence of major faults and thrusts of the basin area. It can be concluded that the combined approach of GIS-based morphometric and geomorphic study of a region allows in the identification of deformed landforms resulting from active tectonics.