Earth Subsidence in the Karaj_Shahriar Area

Risk is defined as the willing or unwilling expose of humans and their belongings to hazard. Analysis of areas located within risk zones is a scientific measure for preparation of appropriate basic information of the level and severity of the risk event. .According to such point of subsidence hazards in the karaj-shahriar is noticeable. Interferometric Synthetic Aperture Radar (InSAR) technique is a valuable tool in monitoring crustal deformation due to its large extensive- massive spatial coverage and high spatial resolutions. Therefore, by using interferometry of radar waves, the rate and value of the subsidence in the studied area have been extracted. Algorithm used in this study is StaMPS (the Stanford Method for PS) and SBAS method by using 24 descending ENVISAT ASAR images spanning between 2003 and 2010. The maximum rate obtained from this method is 136 mm/year.