Redho Surya Perdana, Ongky Anggara, Argo Galih Suhadha, Dita Mulia Pangestika, Aulia Try Atmojo, Muhammad Nabil Al Attar, Putri Sonya, Satrio Muhammad Alif
Land subsidence is a significant issue in urban areas globally, including several cities with a growing population in Northern Sumatera, Indonesia. This study employs Sentinel-1 SAR data and the Small Baseline Subset (SBAS) InSAR technique to monitor land subsidence in Medan, Deli Serdang, Dumai, North Aceh, and Lhokseumawe from 2015 to 2023. The SBAS algorithm was implemented in LiCSBAS with an unwrapped interferogram. Then, to improve the accuracy of land subsidence measurements, atmospheric corrections were applied using GACOS to reduce the effects of atmospheric distortion. The analysis was enhanced using GRACE satellite data to assess the impact of groundwater depletion on subsidence. Results indicated significant subsidence across all study regions, particularly in Medan and Dumai, with rates ranging from -48.6 mm/year to +54.1 mm/year. The findings highlight the critical role of rapid urbanization, excessive groundwater extraction, and oil and gas exploration in driving subsidence. This study underscores the need for sustainable urban planning and aquifer management to mitigate future environmental and infrastructural risks. © 2025 Brawijaya University. All rights reserved.
Geomatics Engineering, Institut Teknologi Sumatera, South Lampung, Indonesia; National Research and Innovation Agency (BRIN), Jakarta Pusat, Indonesia; Geodesy and Geomatics Engineering, Institut Teknologi Bandung, Bandung, Indonesia