Identifying the Basement Structure of the Sula Fault Zone in the Banggai-Sula Microcontinent Region, Molucca Sea, based on 2D Gravity Inversion Modelling using Particle Swarm Optimisation and 3D Modelling using Grablox. Rud.-geol.-naft. zb. 2025;40(2):137-154. doi:10.17794/rgn.2025.2.10