Study of Effective Factors in Gozal Darre and Karafs Alluvial Fans Formation and Investigation of Tectonical Activities on Southern Slope of Khrqan Mountain

The Gozal Darre and Karafs alluvial fans are located on southern slope of the Khrqan Mountains in Hamadan province. The aim of this study is to investigate the effective factors in the creation of southern heights of Khrqan alluvial fans and also to investigate tectonical activtes. To achieve this aim, we used library and field methods. The research materials are topographic and geologic maps, climatic deta and arial photography. Also we used Arc GIS, Google earth and excel soft wars, for observation of landforms, drawing maps and diagrams. The results showed that ence with different formation of alluvial fans; the most impottant factors are related to tectonical activites. Study of quantetive geomorphology index has shown that tectonic movements on the area are active and semi-active. For example Vf index with. 11 and. 72 and S index with 1.14 and 1.7 orderly for Gozal Darre and Karafs basin was estimated, that implication tectonic activities in the area. The evidence and data showed that the role of climatic factors reduced on alluvial fans in the area, in recent years. Also there are regular and logical relationship between alluvial fans features and upstream basins like basin area and morphometry in the study area. The total formation of this alluvial fan main factor is tectonic and other factors like climate, litology, rate and direction of slope is located in subsidiary levels.