**6. Seismological approaches**

where *Bl* is the length of a basin measured from the highest point, and *Bw* is the width of a basin measured at its widest point. Relatively young drainage basins in tectonically active areas tend to be elongated in shape, normal to the topographic slope of a mountain [41, 43].

**Figure 5.** A spatial distribution of basin asymmetry along the northern Wagad area. (B) Estimated relative index of active tectonics (RIAT) distribution pattern of the area. A *and* B *have been generated using Global mapper 18 software and the final* 

Therefore*, Bs* may reflect the rate of active tectonics.

*editing has been done in surfer 14 software.*

140 Tectonics - Problems of Regional Settings

The evidences of geomorphological in the Kachchh Rift Basin (KRB) is also supported by available high resolution seismic structures, fault plane solutions and recorded seismicity at SeisNetG [13, 15, 51]. Theses integrated approaches provide a clue to understand what instigate to generating a negative flower structure of drainage patterns and its role in the seismicity in the regions. The snapshot of the seismic images play important role to understand brittle-ductile dynamics. It also shed light about hidden causative faults and the drainage patterns that can dictate the degree of damage through shaking (**Figure 1B**). Several faults in the Kachchh areas are mapped on the surface but still there are many among the existing factory of faults which still remains undiagnosed and not mapped on the surface [15, 51]. That is why we have determined almost all geological evidences and crustal heterogeneities parameters in the present study to understand the nature and extent of underlain structures controlling drainage network. The available 16 fault-plane solutions of the inferred fault planes of the events (Mw ≥ 3.5) recorded during 2007–2014 [13, 15, 51] (**Figure 1B**). The results obtained from morphotectonic analysis of fluvial networks and seismological approaches are jointly analyzed in the next section.
