Dynamic Displacement using DInSAR of Sentinel-1 in Sunda Strait

Abstract

Sunda Strait’s geographical condition makes it experience many tectonic and seismic events. Deformation monitoring has been carried out with various methods ranging from terrestrial and non-terrestrial surveys. This study aimed to monitor the dynamics of deformation in the Sunda Strait region in 2019 using Differential Interferometric Synthetic Aperture Radar (DInSAR). DInSAR principle analyzes the paired SAR images that have been co-registered with different acquisition times to detect changes along the sensor observation line to the target or Line of Sight (LOS). The SAR data used are Sentinel-1 acquisition on June 1, and October 23, 2019. The results show that the coherence value of the image pair is low due to differences in the phase and intensity values. The maximum uplift value is 0.54 m located in the West Lampung Regency, and the subsidence is −0.3 m in the Pesisir Barat Regency. Uplift results are located in various geological conditions and do not affect by seismic phenomena, whereas subsidence shows its location in the potential area of land subsidence. The dynamics of uplift and subsidence in the Lampung regency are mostly affected by the geological and land use conditions of the locations. HIGHLIGHTS DInSAR provides deformation measurements with a high level of data precision over a large area The selection of image pairs is essential for analyzing ground deformation using DInSAR Lampung Province has experienced uplift and subsidence in several locations The dynamic of uplift and subsidence in the Lampung Province is mostly affected by the conditions of the geological and land-cover condition GRAPHICAL ABSTRACT