Earthquake surface acceleration with slope function amplification approach in Bandung Basin, Indonesia

The Bandung Basin is an area located in the middle of the mountains of West Java, Indonesia. Located at the coordinates of 6 ° - 7 ° South and 107 ° -108 ° East, the area has a large area and is relatively flat. The area is planned to become an Urban Area. The area is threatened by natural disasters, an earthquake caused by the Lembang Fault and a source of shallow and deep background earthquakes. This natural phenomenon can cause a high surface acceleration of the earthquake, causing infrastructure damage. Therefore, earthquake mitigation efforts need significant attention. In this study, the surface acceleration of the earthquake will be analyzed using the Probabilistic Seismic Hazard Analysis (PSHA) method for the 2500-year return period combined with the amplification function of the slope effect. The results obtained are that the highest surface acceleration is near the Lembang Fault, which reaches more significant than 2.0 g and is followed by the area in the middle of the Bandung Basin, which reaches 1.0 g and a small part of the west side reaches 0.2 g. Amplification occurs in relatively flat areas and vice versa; deamplification occurs on the south-central side of the Bandung Basin, associated with hilly/mountainous areas. The slope function amplification method is reliable only applied in a hilly area; if not, this will make a misleading analysis.