Writers : P. Navabpour;A. Saeedi;M. R. Ghasemi
Refference : Geosciences Scientific Quarterly Journal,No.:49-50,P.:2
Publishing Year : 1383

Abstract :
The Shotori mountain range at northern end of the Nayband active fault is one of the east central Iranian ranges in east of Tabas city and playa. Old alluvial cyclic stream terraces and buried Quaternazy fault scarps in western mountain front area, and three kind of old, braided, and active alluvial fans in Tabas plain are witnesses to mountain neotectonic uplifl! westward mgration of Quaternamy sedimentation, and eastward movement of retrograde erosion along seasonal rivers. Ancient perched caves and qanats in alluvial valley slopes present the speed of deep erosion.
Outcropped Neogene antidlinea, old erosional terraces, meandring antecedent river gorgea, and warping of the old fans in Tabas plain all point to periodic active uplift of the plain with respect to the playa. Geomorphic indicea, such as knickpoints in longitudinal river profile, valley width/heigth ratio, and mountain front sinuosity show that the active tectonic movements are due to the Quaternary faults in the Tabas plain and along northern and southern parts of the mountain front, but the middle front seems to be inactive in the present time.
Meanwhile, the 1978 earthquake of Tabas (Ms7.3) after and 1-century seismic gap is a proof to the active westward migration of the deformational front. In this way, the close relationships between the tectonic geomorphology of the area and the seismotectonics of the recent earthquake led us to introducing relic, inactive, active, and new-born mountain fronts in the area; and the role of such studies in better undrestanding of activity and seismicity history of regions is emphasized.
Subject List : Plate tectonic