Issue |
E3S Web Conf.
Volume 447, 2023
The 15th of Aceh International Workshop and Expo on Sustainable Tsunami Disaster Recovery (The 15th AIWEST-DR 2023)
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Article Number | 01010 | |
Number of page(s) | 10 | |
Section | Hazard, Technology, and Infrastructure | |
DOI | https://doi.org/10.1051/e3sconf/202344701010 | |
Published online | 13 November 2023 |
Probabilistic Analysis of the Tsunami Disaster on the Vulnerability Level of Buildings in Painan City, West Sumatra based on the Earthquake Ratio with the Logic Tree Method
1 Civil Engineering, Faculty of Infrastructure Planning, Pertamina University, Teuku Nyak Arief Street, South Jakarta, DKI Jakarta, 12220, Indonesia
2 Civil Engineering, Faculty of Engineering and Computer Science, Bakrie University, Rasuna Epicentrum District, H.R. Rasuna Said Street, Kuningan, DKI Jakarta, 12940
* Corresponding author: happykingprinces@gmail.com
Indonesia is an archipelagic country stretching from Sabang to Merauke and is located at the convergence of the most complex and active tectonic plates in the world, namely Eurasia, Indo-Australia, and the Pacific. One of the regions with a high probability of earthquakes and high tsunamis is the island of Sumatra, which lies between the Eurasian and Indo-Australian plates. Painan city is located in West Sumatra Province, where it is surrounded by three megathrust zones: the Nias-Simeulue segment, Mentawai-Siberut segment, and Mentawai-Pagai segment. These three megathrust zones, namely Nias-Simeulue with an estimated earthquake magnitude of 8.7 Mw, Mentawai-Siberut with an earthquake magnitude of 8.9 Mw, and Mentawai-Pagai with an earthquake magnitude of 8.9 Mw, can potentially cause tsunamis that may reach Painan city. The aim of this study is to investigate the influence of seismic activity level variables and the ratio between large and small earthquakes on tsunami wave height using the logic tree method, assess the tsunami hazard potential using Probabilistic Tsunami Hazard Assessment (PTHA), and evaluate the vulnerability of existing buildings in Painan city. Tsunami simulations in this study were conducted using the Cornell Multigrid Coupled Tsunami (COMCOT) program, which applies the Shallow Water Equation (SWE). Additionally, the Building Tsunami Vulnerability (BTV) equation was used to calculate the vulnerability index of buildings based on their conditions and tsunami wave heights. The calculation of the BTV value for the tsunami height parameter was modified using fragility curves that depict the relationship between force and the probability of tsunami wave damage. From the simulation results, the tsunami height was obtained, which in turn determines the probability of tsunami hazard on buildings with return periods of 1000 and 4000 years. After the simulations, the Building Tsunami Vulnerability (BTV) calculation was performed to determine the vulnerability level of buildings to tsunamis.
Key words: Probabilistic Tsunami Hazard Assessment / Building Tsunami Vulnerability / Logic Tree / Cornell Multigrid Coupled Tsunami / Painan City
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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