Koyna-Warna Shallow Seismic Region, India: Is there Any Geomorphic Expression of Active Tectonics?

This study investigates the geomorphic expression of tectonic control in Koyna-Warna shallow seismic region, lying on Deccan Flood Basalt in India, by examining longitudinal profiles and morphometric parameters by using Digital Elevation Model (DEM) and constrained field examinations. A total of 60 sub-catchments have been analyzed to comprehend the relative tectonic control in the study area. Sub-catchments within the study area depict channel disequilibrium through stream length-gradient index (SL) and normalized steepness index (k(sn)) which are ascribed to numerous transient knickpoints along the drainage profiles. The integrated analysis based on six different morphometric parameters (i.e. basin asymmetry, hypsometric integral, stream-length gradient index, valley width-to-height ratio, elongation ratio, and average normalized steepness index) demonstrates two explicit examples of high tectonics in Koyna-Warna region, are (a) between the Koyna Rift Fault Zone (KRFZ) and Patan Fault (PF); and (b) upstream region of left-hand tributaries of the Koyna river.