The Assessment of Active Tectonic Using Geomorphological Methods in Slopes of Karkas

Geomorphological indicators are usefull and confident implements in tectonical activities assessment. Using these indices one can identify regions that experienced rapid or gradual tectonic activities. The study area locates in the middle of Isfahan province. Karkas mountain is situated in Oroomieh - Dokhtar zone. The orogeny still continue to act in Iran and influence this area. The goal of this study is to assess active tectonic in Karkas slopes. In this study, aerial photographs, landsat ETM data and topographic and geological maps in various scales were used. Geomorphological indicators such as mountion front sinuosity, proportion of the valley width to its height, the indicator of stream length –gradient, drainge asymmetry factor have been used to estimate the rate of tectonic activity in the slopes of Karkas. The analysis and investigation of these parameters and indices showed that this area is tectonically active, but theses forces are stronger in the northeast slopes than the southwest shopes.