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Seismic Microzonation Using the Deterministic Seismic Hazard Analysis (DSHA) Method to Identify the Earthquake Vulnerability in Subdistrict Ulu Belu, Tanggamus Regency (a) Faculty of Earth Science and Technology, Bandung Institute of Technology (ITB), Jl. Ganesa No.10, Bandung, West Java, Indonesia Abstract By the regulation of the Minister of Agrarian Affairs and Spatial Planning/National Land Agency Number 11 of 2021 contained in the Regional Spatial Plan of Tanggamus Regency, the central government plans to carry out more detailed spatial planning in the Ulu Belu sub-district. The region has a considerable investment potential value of up to 5 trillion Rupiah. Earthquake disasters play an important role in causing damage to infrastructure and buildings and can cause other further disasters. Based on the map of earthquake-prone areas of Lampung Province, the Ulu Belu sub-district is categorized as a highly disaster-prone area. Thus, a more detailed earthquake hazard microzonation study needs to be carried out. Earthquake hazard assessment using the Deterministic Seismic Hazard Analysis (DSHA) method is used to determine the peak value of acceleration at the bedrock. Furthermore, a Site-Specific Analysis (SSA) stage is carried out to predict PGA values on the surface. The earthquake source used in the analysis was the East Semangko Fault located about 12 km from the Ulu Belu sub-district with a maximum magnitude of M7.1. The class of sites in this region varies between SE - SB (soft soil - rock). The results of DSHA analysis show PGA bedrock varies between 0.08 - 0.53 g. The distribution of surface PGA values ranges from 0.10 - 0.87 g. Study areas with surface PGA scores in this range are included in the MMI VI to XXI scale. The impact of soil shaking at this intensity can cause damage ranging from mild to severe. Keywords: earthquake, DSHA, SSA, Ulu Belu sub-district, regional vulnerability. Topic: Hydrology, hydrogeology, and geology engineering |
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