Application of Different Coherence Threshold on PS-InSAR Technique for Monitoring Deformation on the LUSI Affected Area During 2017 and 2019

Abstract

Abstract Difficulties encountered in the DInSAR technique is the temporal and geometric decorrelation. This method’s main objective is to identify a single-pixel called Permanent Scatter (PS) over a long-time-interval and for a wide-angle of view variation. In this study, we aim to use the PS-InSAR technique to monitor land surface changes in the LUSI mud volcano area with coherence threshold difference analysis using the Sentinel 1A data set using SARPROZ as a tool. The land surface change that is our focus is west and east of the LUSI. Sentinel 1A data processing with different coherence threshold, affecting the number of PS points formed. Based on Fisher’s test on each coherence threshold showed that cumulative displacement and velocity did not differ significantly. During the 3 years since 2017 - 2019, the West LUSI region experienced average cumulative subsidence of -47.95 mm with an average velocity decline of 19.20 mm/year. The East LUSI region experiences average cumulative subsidence of 60.86 mm in the year, with an average velocity decline of 24.37 mm/year. The results of subsidence and velocity in this study are still in the line of sight (LOS)