POTENTIAL TSUNAMI HAZARD STUDY IN MANDALIKA SPECIAL ECONOMIC ZONE DUE TO MEGATHRUST EARTHQUAKE IN JAVA-BALI SUBDUCTION ZONE

• Main Author: Kamilia Salsabila, Nada
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/62661
• Institution: Institut Teknologi Bandung

Mandalika is one of five Super Priority Tourism Destinations as well as a Special Economic Zone (SEZ) that focuses on tourism activities. Mandalika’s high tourism potential supporting this zone to become a world-class tourist destination. Located in the south of Lombok Island which is facing a subduction zone makes this area prone to tsunami disasters, especially with the existence of seismic gap zone in this area which has a potential to cause large magnitude earthquakes that can generate local tsunami (near field tsunami). In this study, a numerical simulation of the generation, propagation, and inundation of a hypothetical tsunami was carried out using COMCOT v1.7 to analyze the level of potential tsunami hazard in the Mandalika SEZ. This simulation was developed with Scenario-1 due to a ???????? 8.0 tsunami earthquake and Scenario-2 due to ???????? 8.5 typical interplate earthquake. Based on the simulation results, for Scenario-1 the average height is 4.85 m and the maximum height is 10.9 m with an arrival time of 27'31”-36'38” while in Scenario-2 the average height is 8.99 m and the maximum height is 18.4 m with an arrival time of 22'55”-29'53”. The longest inundation is at Serenting Beach with inundation distance 1,494 m for Scenario-1 and 1,783 m for Scenario 2 with inundated area of 526.76 Ha and 1,334.17 Ha, respectively for each scenario. Specific in Mandalika Circuit, the entire area has the potential to be submerged both Scenario-1 and Scenario-2 with a maximum flow depth about 4 m for Scenario-1 and about 8 m for Scenario-2. The potential tsunami hazard in the Mandalika SEZ based on the Integrated Tsunami Intensity Scale (ITIS) is categorized to Scale X for Scenario-1 and Scale XI for Scenario-2, meaning that it has a high and very high level of hazard for each scenario.