Article
Identifikasi Struktur sebagai Jalur Migrasi Sistem Panas Bumi Gunung Ciremai Berdasarkan Analisis dan Pemodelan Gaya Berat
OPHIOLITE : Jurnal Geologi Terapan, Vol. 8 No. 2 (2026), hlm. 11–21
Abstrak
The Mount Ciremai area is a Quaternary volcano that developed within the tectonic framework of the Java volcanic arc and is controlled by magmatic activity and regional fault structures, indicating significant geothermal potential. This study aims to characterize subsurface structures and specifically identify geothermal fluid migration pathways based on the analysis of satellite gravity data from the Global Gravity Model Plus (GGMPlus). The gravity data were processed to obtain the Complete Bouguer Anomaly (CBA), separated into regional and residual anomalies, and subsequently analyzed using gravity field derivatives, namely the First Horizontal Derivative (FHD) and the Second Vertical Derivative (SVD), and further modeled through three-dimensional gravity inversion. The results indicate that the CBA values range from −45.4 mGal to +29.7 mGal, with low-anomaly zones concentrated in the central part of the study area, forming a low-density basin-like pattern. The regional anomaly suggests the presence of deep geological structures and possible influences of magmatic systems, whereas the residual anomaly reveals shallow-to-intermediate density contrasts interpreted to be associated with fracture zones and geothermal alteration. The FHD and SVD analyses consistently identify possible fault systems, including reverse and normal faults with dominant orientations related to sharp gravity anomaly gradients. The 3D inversion modeling indicates a spatial correlation between low-density zones and these fault structures, which are interpreted as the main migration pathways for geothermal fluids. These findings confirm that the integration of derivative analysis and 3D inversion based on GGMPlus data is effective for the preliminary delineation of controlling zones within the geothermal system of Mount Ciremai.