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Morphotectonic Evaluation and Land Surface Deformation Changes in the Western Segment of the Lembang Fault 1Geographic Information Science, Faculty of Social Science Education, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No.229, Kec. Sukasari 40154, Kota Bandung, Jawa Barat, Indonesia Abstract The Lembang Fault in West Java is an active horizontal fault that can cause surface deformation, especially in the western segment of the Cisarua region. The lack of information to the public increases the risk of casualties, so mitigation is needed through deformation monitoring. This study aims to detect and analyze deformation in Cisarua District using active remote sensing technology, specifically DinSAR based on Sentinel-1 imagery (2017 and 2025). Data is processed through pre-processing, filtering, and correction stages, followed by deformation analysis (phase conversion, pattern mapping, classification). The results are used to link deformation with fault activity, identify potential geological hazards, and analyze deformation dynamics temporally. The results show that land deformation in the Western Segment of the Lembang Fault for the period 2017-2025 shows active dynamics with varying uplift and subsidence patterns, where 2017 is characterized by contrasting deformation and 2025 is dominated by broad uplift. DInSAR technology has proven effective in detecting millimeter-scale displacements and mapping the spatial distribution of deformation that is closely correlated with earthquake events. The spatial and temporal patterns in Cisarua District confirm that this area is experiencing dynamic deformation and has a high level of geological vulnerability, thus requiring continuous monitoring. Keywords: Deformation, Lembang Fault, Remote Sensing, Sentinel-1a, DInSAR Topic: Topic D: Geospatial Data Integration |
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