structural analysis of piranshahr fault as the northest part of zagross main resent fault by using dtm model and gis

abstract tectonic, plays a key role in the evolution of morphology and can be distinguished with morphotectonic, rivers and structural parameters. an analysis of morphometric parameters illustrates that the development of them is associated with faults activities and rocks resistance. morphotectonic analysis also supplies seismotectonic setting for a region. for appropriate and survey tectonic activities of piranshahr fault in south west of azarbaijan province as northest part of zagross main recent fault, the morphotectonic indices contain: ratio of valley-mouth width to valley height, ratio of valley-floor width to valley height, ratio of vc and mountain front sinuosity has been calculated. the results of several indices are incorporated to highlight tectonic activity and provide an assessment of a high degree of morphotectonic, neotectonic activities. piranshahr fault with 95 km length produced a seismic hazard magnitude ~ 6.9 in richter scale. key words: morphotectonic, neotectonic, active tectonics,geomorphic indexes.