عنوان مقاله [English]
Northwest-Southeast trending fault zones and fold axial traces are major structures in Hemmatabad area (SE Birjand). Although North-South trending fault zones are major structures in Sistan subzone but many Northwest-Southeast trending fault zones as a branch of East Neh fault zone connect to North-South trending fault zones (such as Hemmatabad fault zone in this area that connect to Cheshmeh zangi fault zone in the east part). Geometric and kinematic analysis of fault planes, slip vectors, fault related fractures, offset streams, fold axial trace show that in Hemmatabad area, many fault zones had been right lateral movement with reverse component along the time. Along two parallel sections (a,b) from southeast to northwest, morphotectonic evidences such as: offset streams,shutter ridges, fault scarps and V ratio has shown tectonic activity in this area.In two mentioned sections from southeast to northwest, V ratio domain(0.31 – 0.58) has increasing range and offset streams domain (6 – 116 meters) has decreasing range.
Eight northeast – southwest trending topographic sections show fault scarp with decreasing appearance from northeast to southwest along every section. Structural and morphotectonic data show that structural growth of NW-SE trending fault zones in East of Iran take place as thrust series from NE to SW direction that introduce an evolution structural pattern. N25E average trending of maximum compressional component is consistent with growth of structural trends in this area.
Key words: , Nehbandan fault zone, Hemmat abad fault zone, East Iran, Structural growth, right-lateral fault,.