Neo Tectonic Assessment of Kalmard Fault by Using GIS, Shirgasht District (Central Iran)

Neo tectonic activity is determined by Quantitative measurements of morphologic Indexes and analysis of landscapes. Streams and drainage basins are the most important feature which are affected by the recent tectonic activities. In this study six morphologic Indexes were measured on Kalmard Fault in north of Tabas block (central Iran), including the stream-gradient index (SL), drainage basin asymmetry (Af), hypsometric integral (Hi), valley floor width-valley height ratio (Vf), drainage basin shape (Bs) and mountain-front sinuosity (J). and its result combined with seismologic study of the Kalmrad fault. These process were carried out on Aster DEM with 30 meters resolution in ArcGIS 10.1 and 89 catchment and longest flow path of each basin were extracted. According to field data and result of measurements, Neveng-Kuh, Pirhajat-Kuh are the most active regions and Kalmard Fault has post Neogene tectonic activity. Earthquakes occurrence on these faults and magnetic faults shows recent activity of this area.