Geological disaster in South Sulawesi consists of earthquake, landslide, tsunami and flood. These hazards are closely controlled by the geological condition of the province.
- Earthquake in South Sulawesi is located in regions where the major fault occurred such as Walanae Fault in the central part of the province and Matano Fault in the northeastern part of the province and Palu-Koro Fault in the northern part.
- Based on the material, landslide in South Sulawesi can be classified as the slide, flow and rockfall. Furthermore, the origin of the landslide in South Sulawesi is geologically classified into three groups; 1) morphology-related, 2) structurally-related, 3) stratigraphically-related. High weathering process due to tropical condition in South Sulawesi is also responsible for provoking the landslide. Most of the landslides are triggered by torrential rains lasting more than two day periods which severely add the impact of the landslide.
- Some coastline areas facing to the seismically-active sea in which active faults are developed generating the tsunami. Bantaeng, the southern part of Bulukumba (Bira Beach), Makassar, Pare-pare and Palopo are included as tsunami-prone area.
- In term of geology point of view, flood in South Sulawesi is due to three main factors, namely 1) deforestation, 2) high-sedimentation rate and 3) sporadic urbanization. The low altitude coupled with constant heavy rainfall and high tide made the flood more severe in some areas such as Makassar, Gowa and surrounding city close to the coastline.
The result of this study shows that geological characteristic intimately controls the occurrence of natural disaster in South Sulawesi and therefore the geological data should be considered in mitigation strategy. Intensive and detail geological study is needed to produce a detail micro-zonation map to build a strong disaster mitigation model in the future.
This research is financially supported by Riset Unggulan Universitas (RUNHAS) 2019. The author would like to express his gratitude to the student in Field Geology Laboratory for their cooperation during this research. This research is also benefited from some discussion with other experts both from local and national government officials.
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