Subsurface Modelling of the Progo River Area Using Euler Deconvolution of Topex Gravity Data

Abstract This study explores the subsurface characteristics of the Progo River area in Yogyakarta, Indonesia, using TOPEX satellite gravity data to investigate the Progo Fault. Understanding this fault is crucial, as it poses a significant earthquake risk like the 2006 Yogyakarta earthquake. The analysis focused on deriving the Complete Bouguer Anomaly (CBA), performing Euler deconvolution, and constructing a 2D subsurface model to enhance the understanding of the area’s geological structure. The research derived the Complete Bouguer Anomaly (CBA), ranging from 87.6 mGal to 134.4 mGal, and performed Euler deconvolution to map the anomaly sources at depths between 778 and 1190 meters. A 2D subsurface model was developed, revealing four distinct geological formations: the Kebobutak Formation, the Sentolo Formation, the Young Volcano Formation, and alluvial deposits, offering insights into the area’s potential fault activity.