ESTIMATION OF LAND SUBSIDENCE USING SAR INTERFEROMETRY: (A CASE STUDY IN AZAR OIL FIELD, ILAM, IRAN)

The focus of this study is investigation of land subsidence in Azar oil field with the use of Interferometry Synthetic Aperture Radar (InSAR) of sentinel-1 satellite. Azar oil field is one of the oil fields of Iran. This oil field is located in the east of Mehran in Ilam. After extracting a large number of oil wells, heavy rainfall occurred and widespread and extensive cracks were formed on this oil field. These rainfalls caused these cracks to increase. For understanding the causes of this phenomenon, we must monitor the amount of land subsidence and obtain the displacement vectors and the best possible accuracy of Surface Deformation. We processed 2 SLC SAR images (two complex radar image) during April2015 to July 2016. The topographic phase contribution was removed using the 3-arcsec (90 m) Shuttle Radar Topography Mission (SRTM), Digital Elevation Model (DEM). We use Differential of Interferometry Synthetic Aperture Radar method.