Subsurface structures identification at Bandung Basin based on gravity data

Abstract

One of the metropolitan areas in Indonesia, Bandung Basin, is also known to have a high risk of disaster due to geological conditions and fault structures. In order to identify subsurface structures and fault locations, a study was carried out using the gravity method. By utilising TOPEX satellite data, subsurface modelling is performed using the forward modelling method. Based on the modelling results, the Bandung Basin is known to be dominated by young volcanic products such as tuff and lava with a density of 2.2 to 2.65 gr/cm3. However, sedimentary rocks with a density of 2.4 to 2.7 gr/cm3, such as sandstone, clay, and breccia, dominate in the western region of the basin. It is also known that there are indications of the presence and types of faults that cross the basin area based on the residual anomaly of gravity and also 2D modelling.