Investigation of neotectonic activities using geomorphic and seismic potentials of faults (Case study: Pine-basin watershed)

Tectonic factors are among the dynamic factors that always affect watersheds and especially the longitudinal profile of rivers. Tectonic morphology studies the shapes created on the ground created by tectonic mechanisms. In order to study active neotectonics, tectonic morphological features of the catchment are used. In this study, the neotectonic activities of the Puppet basin watershed have been investigated using geomorphic indices. At first, using Gis10.3 software and Archydro plugin, sub-basins and waterways of the study area were extracted. For accurate calculation in each of the 19 sub-basins, topographic maps of 1: 25000, geological maps of 1: 100000, digital model of 30 m height were used, and finally For each of the indicators, the zoning map of the study basin was prepared in five categories. Finally, according to the calculated values ​​of each of the indicators, the active relative tectonic index for the basin was extracted. According to the relative active tectonic index of the study area, it was divided into five categories: very high, high, medium, low and very low neotectonic. Based on the evaluation of seismicity, this result was obtained. The results of this study show moderate neotectonic activity in most sub-basins of Topraghi that in these areas the fault activity is not intense and therefore does not pose much danger to residential areas.