Evaluation of neotectonic activities in East-Yazd

The study area is located in the east of Yazd and is part of Yazd block (western block of central Iran). There are two major fault systems, Anar and Kharanagh with lengths of 100 and 62 km and numerous minor faults represents an important tectonic phenomenon in the region. The aim of this study is to investigate neotectonics in this area by using geomorphic indicators. To achieve this goal, have been used of seven geomorphic indicators: Hypsometric integral (HI), Drainage basin asymmetry factor (AF), Stream length- gradient index (SL), Mountain Front sinuosity (Smf) and the ratio of valley floor width to depth Valley (Vf), River sinuosity index (S), Basin shape factor (Bs). Based on Active tectonics indices (Iat), the study area is divided in Four terms of tectonic activity rates, category 1 (very high tectonic activity, 7.4% of the region), category 2 (up 74%), category 3 (average 11%) and category 4 (less 7.4%). Morphotectonical and morphological evidences indicate that the rate of tectonic activity in this region is moderate to high. According these evidences, the northern part of Kharanagh fault and southwestern part of Anar fault are more active than other parts.