J. Ind. Geophys. Union ( September 2017 ) Morphotectonic of Sabarmati-Cambay basin, Gujarat, Western India v.21, no.5, pp: 371-383 Morphotectonic of Sabarmati-Cambay basin, Gujarat, Western India Vasu Pancholi*1, Girish Ch Kothyari1, Siddharth Prizomwala1, Prabhin Sukumaran2, R. D. Shah3, N. Y. Bhatt3 Mukesh Chauhan1 and Raj Sunil Kandregula1 1Institute of Seismological Research, Raisan Gandhinagar, Gujarat 2Charotar University of Science and Technology (CHARUSAT), Vallabh Vidhyanagar, Gujarat 3Department of Geology, MG. Science College Ahmedabad, Gujarat *Corresponding Author:
[email protected] ABSTracT The study area is a part of the peri-cratonic Sabarmati-Cambay rift basin of western Peninsular India, which has experienced in the historical past four earthquakes of about six magnitude located at Mt. Abu, Paliyad, Tarapur and Gogha. Earthquakes occurred not only along the two major rift boundary faults but also on the smaller longitudinal as well as transverse faults. Active tectonics is the major controlling factor of landform development, and it has been significantly affected by the fluvial system in the Sabarmati- Cambay basin. Using the valley morphology and longitudinal river profile of the Sabarmati River and adjoining trunk streams, the study area is divided into two broad tectono-morphic zones, namely Zone-1 and Zone-2. We computed stream length gradient index (SL) and steepness index (Ks) to validate these zones. The study suggests that the above mentioned structures exert significant influence on the evolution of fluvial landforms, thus suggesting tectonically active nature of the terrain. Based on integration of the morphometry and geomorphic expressions of tectonic instability, it is suggested that Zone-2 is tectonically more active as compared to Zone-1.