A High Resolution of Terrain Gravity of Bandung Area

Abstract

The Bandung basin spans around 30 km by 60 km and is encircled by mountains. Therefore, the gravity due to terrain variations has significantly contributed to the area’s Complete Bouguer Anomaly (CBA). In this study, we have applied a high resolution of terrain gravity (TG) using the block of rectangular prisms with 100 m x 100 m x 10 m dimensions. The investigation includes up to 70 km x 100 km terrain areas where the data was obtained from the shuttle radar topography mission digital elevation model (SRTM DEM). The results show that the southern region has about 20 mGal TG higher than the northern region due to more and higher mountain variation. Our investigation also found that the reasonable terrain areas included in the calculation must be at least 40 km wider from the outer gravity stations to get less than one mGal change in the 5 km terrain area width change. This result gives a good overview of the terrain effect on gravity calculation and interpretation, especially in the Bandung area.