dc.description.abstract | The Sumatra region is known for its history of devastating earthquakes, with the most significant being the 20046 { M}_w9.2 Aceh earthquake that occurred at subduction interface. In fact, not only the great potential from the source of the megathrust but also the threat due to the activities of the Sumatran fault system (SFS). A progressive approach for assessing the probabilistic seismic hazard is used in this study. In order to better illustrate possible seismic activity of each seismogenic source, our analysis incorporates the truncated exponential model, the long-term probability modelling with time-dependent Brownian Passage Time (BPT) model, and the earthquake rates considering complex multiple-segments rupture along the Sunda Trench and the Sumatran fault. To overcome the lack of ground-motion models, earthquake scenarios were used to choose the appropriate ground motion models for shallow crustal, subduction interface, and subduction intraslab regions, respectively. To understand the impact of seismic sources to some target sites, demonstrate the hazard contributions of magnitude-distance sets through disaggregation. The results indicate that the SFS is the primary contribution to the overall seismic hazard in the region, with peak ground acceleration (PGA) values at bedrock sites of Sumatra in both short and long return periods, e.g., 10% and 2% probability of exceedance in 50 years, respectively. Besides, the maps for spectral periods shows high spectral acceleration values levels in the vicinity of Sumatran fault at Sa 0.2 s with return periods of 475 years and 2745 years are 1.0-1.8 g and 3.8-4.0 g, while the Sa 1.0 s had lower values of 0.6-0.8 g and 1.2-1.8 g for longer periods of time, respectively. In our the hazard maps proposed in this thesis, we evaluated the bedrock engineering (Vs30 =760 m/s) and sSite effects (Vs30 by USGS). SSite effects has an impact on the Sumatran plain and specific areas around the Sumatran fault. The outcomes of this study can provide valuable information for emergency response planning, urban development, and preparedness of governmental agencies before a disastrous earthquake in the Sumatra region. | en_US |