**5. Relative index of active tectonics (RIAT)**

Several remote sensing studies have used the geomorphic indices to obtain index of relative tectonic activity [48–50]. To understand the RIAT of the fault segments, the results of all calculated geomorphic indices were synthesized. In this study we used geomorphic indices of active tectonics to obtained RIAT for the (NWF) North Wagad Fault, (GF) Gedi Fault, Bharudia Fault and (IBF) Island Belt Fault. Based on these classes we have considered each basin class average and combined to obtain the RIAT. The values of RIAT is assigned into five classes as Class- VI (RIAT >4), Class V: (> 3.5 RIAT <4), Class IV: (>3 RIAT <3.5), Class III: (>2.5 RIAT <3), Class II (>2 RIAT <2.5), and Class I (RIAT <2), (Supplementary Table 1; **Figure 5B**). Depending on the relative index of active tectonics classes, Western part of Wagad uplift covering basin 11, and Easterly covering 15 and 16 comes in highly active zone and shows offsetting drainage pattern (Class 5). Basin 1, 3, 4, 7 and 10 in Bela island, basin 13 and 18 in Wagad uplift are tectonically active and comes in (Class 4) zone and also delimiting by transverse fault between Basin 5, 6 and 9 in Bela Island 12, 14 and 17 in Wagad uplift are moderately active zones (Class 3) (**Figure 5B**). Basin 2 is intermediately active and comes in (Class 4) and Basin 8 is low active region.
