Tectonic geomorphology of Karkheh River Basin (West Iran)

Geomorphic indices are major tools to recognize tectonics activities.
These indices have the advantage of being calculated from Arc GIS package over large areas as reconnaissance tool to identify possible geomorphic anomalies related to active tectonics.
In this research, Karkheh river basin was selected and six geomorphologic indices; drainage basin asymmetry (Af), stream-gradient index (SL), drainage basin shape index (Bs), mountain-front sinuosity index (Smf), valley floor width-height ratio (Vf) and hypsometric integral (Himatter) were calculated. Then, the values were classified in three groups and analyzed. The area of the three class as follows:Class2) 12180 km2, 23.7%
Class3) 32318km2, 62.9%
Class4) 6843km2, 13.3%
The region has an area of about 51341 km2, so this result presents the moderate relative activity in the extensive parts of the area.