STUDY OF TSUNAMI PALU 2018 FLOW DEPTH GENERATED BY EARTHQUAKE AND SUBMARINE LANDSLIDE IN PALU BAY COAST AREA

• Main Author: Reza Jaya Negara, Muhamad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/51062
• Institution: Institut Teknologi Bandung

Indonesia is a region that has high seismic activity. Therefore, Indonesia is prone to a potential tsunami. Sulawesi Island is one of the islands in Indonesia that potentially affected by tsunami exists. The potential due to Palu-Koro fault that moving north to south within interval period twenty years. On September 28, 2018, has happened the earthquake with Mw 7,5 magnitude and the location of the epicenter is 0,18o, 119,85o which is 80 kilometers from Palu City, Central Sulawesi. Based on National Disaster Management Authority (BNPB) Indonesia report, there are 4.340 fatalities and 10.679 wounded victims caused by a combination of the tsunami, landslide, liquefaction, and building collapse after the earthquake occurrence. Because of that, the numerical simulation of Tsunami Palu 2018 is needed to calculate the flow depths around the coastal area, specifically in the southwest (Ulujadi sub-district), south (East Palu and West Palu sub-district), and southeast (Mantikulore sub-district) Palu Bay that generated by the earthquake and submarine landslides. Tsunami numerical simulation that generated by the earthquake and submarine landslide was inspected by Cornell Multi-grid Coupled Tsunami Model (COMCOT) with Non-linear Shallow Water Equations (NSWE) equations and nested grid to 5 levels. Bathymetry and topography data acquired from Geospatial Information Authority (BIG) Indonesia. The source of tsunamis such as the earthquake based on the report from Laboratory of Remote Sensing and Geoinformatics for Disaster Management, Tohoku University with uniform slip study case and the scheme of landslides refer to the research that has been conducted by Gusman et al (2019). Subsequently, the result of simulation compared to filed survey data from Paulik et al (2019) and Syamsidik et al (2019) at 189 point observation. The numerical tsunami shows that Aida number ???? and ???? lies on 0,97 and 1,54 respectively. The distribution of tsunami run-up overall varies between 2,89 and 7,71 meters. The maximum tsunami height in the coastline varies between 2 and 12 meters. Then, the flow depth varies on 0 - 8 meters. The highest tsunami flow depth lies on 8 meters located at the West and North Palu sub-district. The flow depth height varies on 2 - 6 meters locates in Ulujadi and East Palu sub-district.