Analysis of Ground Movement Event in Brebes Regency on April 17 2025, Using the DInSAR Method with SNAP Desktop
M. Faturrahman Wirasakti, Irghan Santiz R.A, S.T

Ministry of Public Works

Abstract

On April 17, 2025, Mendala Village in Brebes Regency, Indonesia, experienced significant ground deformation triggered by extreme rainfall totaling 200 mm over a two-day period. This event was exacerbated by clay-rich soil, steep slope morphology, and ongoing deforestation. Based on data from the Regional Disaster Management Agency (BPBD), the incident resulted in damage to 112 residential structures, the displacement of 383 residents, road cracking over a 5 km stretch, and maximum land subsidence of &#8722-20 cm affecting approximately 50 hectares. This study applied the Differential Interferometric Synthetic Aperture Radar (DInSAR) technique using Sentinel-1 imagery acquired on April 8 and 20, 2025, processed through the SNAP Desktop platform to assess surface displacement. The results revealed vertical ground movement ranging from &#8722-20 cm to +22 cm, with most areas remaining relatively stable, in alignment with field observations reported by BPBD. The deformation was primarily associated with excessive hydrological loading and anthropogenic disturbances, particularly deforestation. Based on these findings, the study recommends several mitigation strategies, including population relocation, improved slope drainage, reforestation, and continuous monitoring utilizing InSAR-based remote sensing approaches.

Keywords: Ground deformation, Brebes Regency, DInSAR, SNAP Desktop, Sentinel-1

Topic: Topic B: Applications of Remote Sensing