Tsunami Inundation Modeling in Pangandaran Coastal Triggered by a Mw 8.7 Megathrust Earthquake off the Southern Coast of West Java

The southern coastal area of Pangandaran Regency is highly vulnerable to tsunami disasters due to its proximity to the megathrust zone in the Indian Ocean. This study aims to model tsunami scenarios triggered by a megathrust earthquake with a magnitude of Mw 8.7 and to map the potential tsunami hazards in the study area. The modeling was performed using COMCOT v1.7 software with three layers of different resolutions to capture the dynamics of wave propagation from the open sea to the coast. The simulation results show that the first tsunami wave reached the coast of Pangandaran Regency at approximately 25 minutes, and the maximum height reached 16.24 m. Furthermore, based on the tsunami hazard map, it can be shown that the Cimerak and Pangandaran subdistricts are included in the high hazard zone, with affected areas of 19.28 km 2 and 16.07 km 2 , respectively. These findings emphasize the importance of risk-based mitigation planning, particularly in determining evacuation routes and coastal spatial planning.