Aseesment of Shekarab Fault Scarps Migration, one of Seismic Source forBirjand City

Abstract Shekarab Fault system is located at north of Birjand city include fault scarps parallel to the main fault. For investigate the directionofmigration, fourcross-sections perpendicular to the fault has done. In all thesesections, by moving from north to south, the older lithological units are trusted over younger ones. Unitswith lowresistanceincludingshaleandmarl are locatedinthe southern part, andunits with high resistancesuch aslimestoneand sandstone are locatedin the north side of Shekarab fault. In various sections, by moving from north to south, an increase in the slope of the fault scarp is noticed. This cases and presence of new Qanat inside south of fault and sinstral movement in stream and cutting and tilting in Quaternary sediments indicate the growthand lateral migration in Shekarab faultscarps is from northto south. In four sections, espaces bettwin scarps in shale and marl are less than  sandstone and crystalline limestone. In analyzing sections, the estimation distance -27 meters- from the last scarp can be introduced as the later activity candidate.