monitoring of pre-seismic deformation of ahar-varzegan fault using time series sar interferometry

interferometric synthetic aperture radar (insar) technique is valuable tool in monitoring crustal deformation due to its large spatial coverage and high spatial resolutions. in this paper, the intersiesmic crustal deformation occurred before earthquake on august 2012 in ahar-varzegan located in north-west of iran is studied using persistent scattering interferometry. the psi algorithm used in this study is the stanford method for ps (stamps) and 20 descending envisat asar images spanning between 2003 and 2010 are applied. the maximum rate obtained from persistent scattering results is 9 mm/year. the deformation monitoring results of south ahar fault mechanism showed a right lateral strike slip in all segments of fault, which is consistent with the geology data.