The evaluation of Active Tectonics in north of Esfarāyen city by using morphological evidences and morphotectonic indicators

The evaluation of Active Tectonics in north of  Esfarāyen city by using morphological evidences and morphotectonic indicators.Esfarāyen city is located on the southern slopes of Aladagh Mountains in northeastern of Iran. The northern part of the city, experienced intense  tectonic activities. Due to the high population density and proximity to the  Bojnord city ,center of North Khorasan Province, the study of tectonic activity in this area is necessity. The study of tectonic movements was done in two parts of morphological evidences and morphotectonic indicators. Based on morphological evidence such as numerous earthquakes, geological  formations , change in direction of faults, the displacement in geological formation and river deviation is indicated that this area is part of tectonic active area. morphotectonic studies were performed by using of compactness indicators, Several morphotectonic indices have also been used for morphotectonic studies, and its values for Gravelius coefficient are 1.99, for the ratio of width to valleys’ height (vf) indicators are0.938,  for screw mountain front (smf) are 1.38, basin’ warping coefficient (AF) are 54.28, river sinusoidal index (s) are1.29 and relative tectonic activities index (Iat) are1.41. The results of all these factors, the area will be tectonically active regions. The studies also showed that the Bidwaz basin in central part of the region  And Roein Basin in West is experienced severe tectonic activities and the Cal Valayt basin Basin in the East region is experiencing  relaxed tectonic movements