Morph Tectonic Interpretation of Soluklu Basin (Northern Khorasan) Using Geomorphic Indices

By recognizing the tectonic effects on fluvial systems، the value and importance of rivers in the study of tech tonic activities were recognized. The Study of stream channels and their displaced deposits by faulting at earthquake time، indicates the amount of displacement and also gives special information about the evaluation of earth quake hazards in the future. The study area is located in the central Kopeh Dagh (Northern Khorasan) and NW Bojnurd. Kopeh Daghs faults are responsible for major destructive earthquakes in the 19th and 20th centuries and represent an important seismic hazard for this populous region of NE Iran. In this study، In order to study the morphotectonic of Soluklu basin، some of Geomorphic indices including drainage basin asymmetry factor index (AF) and stream length-gradient index، transverse topographic system (T)، (SL)، hypsometric curve (Hc) and hypsometric integral (Hi) were calculated. Fractures of the study area are extracted by using green، red and near infra red band of Aster image. Aim of this research is identifying tectonic activity and high hazarding areas using geomorphic indices. Calculating various indexes shows that tectonic activity in the study area is high، least amount of tectonic activity is related to the north side and the highest amount of tectonic activity is related to south side of Soluklu basin. Calculating various indexes shows that appropriate place for build and urban development is the upstream part and the most inappropriate area for build and urbanization is the downstream part.