**3. Data and methodology**

To investigate the relationship between brittle - ductile dynamics and surface processes in northern Wagad, we focused on topographic features (filtered topography, swath profiles, local relief), and hydrography (river longitudinal profiles), We used two elevation data sources: the CARTOSAT 2.5 m resolution digital elevation data (http://bhuvan.nrsc.gov.in) for regional scale analysis and the SRTM (http://srtm.csi.cgiar.org) of 90 m resolution for detailed analysis. Seismic tomography has been used to evaluate shallower to deeper surface dynamic process. The digital elevation model extracted from the SRTM was validated with the Survey of India topographic map (1:50,000) scale. To extract drainage network DEM data is used and 27 northward and south ward flowing rivers basins were generated. We calculated several tectonic attributes namely stream length-gradient Index (SL); steepness index (Ks), hypsometric integral (HI), asymmetric factor (AF) and Basin shape (BS). Based on results obtained from above analysis, spatial distributions of relative index of active tectonics (RIAT) are estimated for North Wagad/Bharudia, Gedi and Island fault zones. The dimensions of these drainage basins are given in **Table 1**.
