Agus Laesanpura, Benyamin Oozatulo Telaumbanua, Toni Rahadinata, Gestin Mey Ekawati, Asep Sugianto
Cross-sections of volcanic structures are generally constructed using existing surface rock data. The detailed subsurface is not accessible because of a limited approach; as a result, precision is less accurate. Geophysical data obtained from surface gravity measurements will improve this phenomenon based on the response of density variation through forward and inverse modelling. The joint interpretation will make it possible to improve the subsurface model and to apply it in volcano deposits that experience a throw. Gravity data acquisition is 200 points over an area of 16 × 14 square kilometres. An anomaly study will focus on near-surface phenomena, where modelling shows that inversion needs to be enhanced by mesh refinement. In addition, forward modelling renders the model more realistic. The results show, the fault reaches a half km. It is not seen in the geology section, and the density variation shows 0.3 grams/cc. This density change is interpreted for the pyroclastic in the depression segment. Fumaroles may interpret as the water percolating pathway from the peak through the flank structure. The meteoric water flows inside the volcanic deposits and the fault plane is the ends of the meteoric water reaching the outside. © Published under licence by IOP Publishing Ltd.
Institut Teknologi Bandung, JL. Ganesha 10, Bandung, Indonesia; Institut Teknologi Sumatera, JL. Terusan Ryacudu, Lampung, Indonesia; PSDMBP - ESDM, Jl. Soekarno Hatta No. 444, Bandung, 40254, Indonesia
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