Development of Synthetic Aperture Radar (SAR) based satellites provide remedies to major geohazards under critical situations around the world. Sentinel 1A mission with the revisit period of 12 days helps to serve the objective in an effective manner. With the availability of Interferometric Wide Swath (IW) mode, Sentinel 1A mission is capable of monitoring the surface deformation using InSAR techniques. On November 12th, 2017, an earthquake with a magnitude of 7.3 occurred in the Iran/Iraq border lead to the enormous disaster reaching over 500 victims. The study focuses on measuring the deformation caused due to earthquakes by using Differential SAR Interferometry (DInSAR). VV polarization of Sentinel Data and SRTM DEM are used as an input to GMTSAR for the development of interferogram. Based on the results obtained, it is found that a maximum of 85.1 cm deformation occurred and nearly 1500 km2 of the area is severely affected.

Differential SAR interferometry (DInSAR) techniques is extensively utilized over decades to monitor and detect surface distortion. Interferometric SAR results obtained from Sentinel 1 data experiences phase delay due to interference with the atmospheric water vapour and pressure and DEM is considered as one of the important parameter in topographic phase removal. In the present study an attempt was made to eradicate the atmospheric errors and to assess the variation of LOS displacement w.r.t. different DEM. Results concluded GACOS based atmospheric correction eradicates the atmospheric error and helps in improving the quality of LOS displacement. Comparison of InSAR results by utilising SRTM, ALOS and Cartosat DEM and GACOS concluded that LOS displacement varies based on the accuracy of DEM and its resolution with the minimum error identified by utilising CartoDEM over Kodagu region.