LAND DEFORMATION MONITORING USING D-INSAR TECHNIQUE DURING LOMBOK EARTHQUAKE OBSERVED BY SENTINEL-1A/B

Abstract

The significant ground deformation occurred at Lombok Island due to the large scale of series Earthquake in shallow depth from July to August 2018. Extract the information of ground deformation on the study area, Differential Interferometry Synthetic Aperture Radar (D-InSAR) technique was applied. The observation supported by SAR satellite data of Sentinel-1A/B (C-band) 5.5 GHz provided by the European Space Agency (ESA). The satellite direction observation is from ascending and descending orbit with vertical transmit and vertical received (VV) polarization. The data acquisition is taken from July 2018 to August 2018 in three pairs before and after the earthquake hit the Lombok Island. Three zones have significant land deformation during the Lombok earthquake in 2018 namely zone A, zone B and zone C with 16 cm, 25.2 cm, and 28 cm uplift in the line of sight (LOS), respectively. The value carried out by comparing the two-close time acquisition before and after the earthquake. Finally, the result of D-InSAR processing validates by ground data observation taken from an optical image of airborne