Active tectonics of the Roudbar region: with special reference to the landslides of the area

The population of Rudbar in northern Iran, is due to Steep slopes of topography, Sloping Loose Materials, active tectonic phases, Construction of roads and railways, from areas prone to landslide events .In this reaserch, in the first phase, based on ground surveys, a geologic map of 1: 25,000, satellite images and  other data of Rudbar region, range and status of landslides of the region were identified. Structural and weight factors (Slope loading) had the greatest impact on the occurrence of this incident, and the main motive for most of them is the structural factor. This important requirement of the determination of how tectonic activities are necessary to predict and control the phenomenon of landslide in the substructure of Developmental and environment in Rudbar region. therefore, in the second phase of the study, the geomorphic indicators of the mountain front sinuosity (Smf), ratio of valley floor width-valley height (Vf),  stream Length (SL), basin shape (Bs) and asymmetric factor (Af) were used. Then, the results of the indices, as an indicator of the relative tectonic activity (LAT), showed that most sub-basins have high and moderate tectonic activity.  In terms of  width, the high class with an area of 195.55 square kilometers (67.21%) covers total of the area. The spatial integration of the identified landslide zones in the first part of the research with the tectonic zones extracted in the second part shows the adaptation of this zone in the two class. Occurrences zone The landslides of the Fatalak, Lavie, Rudbar, Filde are located in zones with intense tectonic activity, and the landslides of Dashtegan, Talabar, Taklim, Nesfi, Dolatabad, Herzvil are located in moderate tectonic active zones. Detailed studies on engineering and geological in larger scales should be undertaken to prevent future landslides and more detailed reports for any developmental and environmental activities in the Rudbar region.