Probabilistic Seismic Hazard Analysis for Makasar
Habibburrahman1) Tati Zera1) and Titi Anggono2)
1Physics Dept. Faculty of Sciences and Technology, Syarif Hidayatullah Islamic State University, Jakarta.
2 Indonesia Institute of Science, Serpong, Tangerang Selatan
Abstract
Abstract. The study of seismic hazard is carried out to minimize the impact of earthquake disasters in particular region. The study presented a seismic hazard analysis using a probabilistic approach for Makassar city, South Sulawesi. PSHA analysis is carried out, namely at T = 0 secods (PGA), T = 0.2 seconds (short period) and T = 1 second ( long period ). The Three dimensional earthquake source model and various attenuation functions that are considered to be in accordance with the seismic characteristics and earthquake source models of the Indonesia-s region are used to calculate the peak ground acceleration with a probability exceeding 10 % and 2 % in 50 years in bedrock. The software used in this analysis is ez-frisk 7.25. The result show an acceleration value of 0.07 g for PGA, 0.13 g for T = 0.2 seconds, and 0.09 g for T = 1 second with probability exceeding10 % in 50 years, and an accelerationvalue of 0.12 g for PGA, 0.22 g for T = 0.2 seconds and 0.15 g for T = 1 second with a probability of 2 % in 50 years. Based on the deagregation curve, the earthquake that make the biggest contribution hazard to the city of Makassar is an earthquake with average magnitude of 6.36 Mw and average distance of 412.72 km from Makassar.
Keywords: Seismic hazard, PSHA, Peak Ground Acceleration, Deagregation
Topic: Environmental Magnetism