[S-CG49] Integrative seismic and secondary hazard/risk assessment

[SCG49-P03] A Seismic Source Database for Tsunami Hazard Assessment in Taiwan Using SSHAC Level 3 Data and the Recipe Method

*Min-Hsuan Chang¹, Ming-Che Hsieh¹, Yen-Yu Lin^1,2, Pao-Shan Hsieh³, Po-Shen Lin³, Yin-Tung Yen³, Yi-Ru Lin⁴, Yi-Cheng Chang⁴, Arthur Tzyy-Hsuang Perng⁴ (1.Earthquake-Disaster & Risk Evaluation and Management Center (E-DREaM), National Central University, Taoyuan, Taiwan, 2.Department of Earth Sciences, National Central University, Taoyuan, Taiwan, 3.Disaster Prevention Technology Research Center, Sinotech Engineering Consultants, Inc., Taipei, Taiwan, 4.Power Engineering Department, Sinotech Engineering Consultants, LTD., Taipei, Taiwan)

Keywords:Seismic source parameterization, SSHAC Level 3 project, Recipe method, Tsunami hazard assessment

Taiwan is located at the Eurasian and Philippine Sea plate boundary, which has created orogenic belts and complex fault systems, resulting in seismic hazards for Taiwan. Numerous offshore seismogenic structures pose a potential and severe threat of tsunamis to Taiwan, making it essential to conduct the relevant analyses. In this study, we compiled earthquake source parameters from the SSHAC Level 3 project for seismic safety in Taiwan and adapted them for tsunami hazard analysis. The SSHAC Level 3 project integrates recent research on seismic sources in Taiwan, extensively utilizing foundational data provided by the Taiwan Earthquake Model (Shyu et al., 2016; Shyu et al., 2020). The outcomes of the SSHAC Level 3 projects offer comprehensive seismic source characterization (SSC) models for both crustal and subduction-zone sources. Subsequently, we identified and selected potential tsunami-generating sources to be used as inputs for earthquake-induced tsunami simulations. Based on logic tree branches and fault geometries, we defined various fault models with moment magnitudes using empirical relationships, and each fault model is treated as a tsunami scenario. Following the Recipe method (e.g., Irikura and Miyake, 2011), we positioned asperities at different locations on the specified fault plane. The recurrence interval of each scenario is also estimated according to slip rates from the SSHAC Level 3 database. Therefore, these parameterizations collect 4,410 scenarios for analyzing tsunami hazards in Taiwan. In applying the developed database, this study provides detailed tsunami hazard curves, with a nuclear power plant serving as a case example to demonstrate the practical use of the data. This case illustrates how the results can assess tsunami hazards for critical infrastructure.