Time Series InSAR Analysis over Jakarta Metropolitan Area

Abstract

Most of the previous geoscience studies in Jakarta found that the area is affected by land subsidence. However, it is difficult to understand the spatial distribution since continuous geodetic observation is not available. The development of SAR satellite-based remote sensing enables ground deformation observation over a long period and in regular time. This study presents the ground deformation time series analysis for the Jakarta Metropolitan area based on the InSAR technique. Using the small baseline subset approach, we construct time series of ground deformation constrained from Sentinel-1 interferograms provided by ASF DAAC Hyp3. Mintpy tool is utilized to obtain the time series analysis. It is found that for 7.6 years observation period since late 2014, land subsidence was only locally spotted in certain areas. The average velocity of ground deformation in the Jakarta Metropolitan area varies from −5.8 cm/year to 1.2 cm/year. It means uplift phenomena are also detected in Jakarta metropolitan area. It is also found that the time series of ground deformation fluctuates in seasonal patterns and may relate to ground water recharge during the rainy season.