Various Fault-Slip Asperity Models for ETF-Based High Frequency Strong Motion Simulation of the Shanchiao Fault in Taiwan

Various Fault-Slip Asperity Models for ETF-Based High Frequency Strong Motion Simulation of the Shanchiao Fault in Taiwan

High frequency strong motion simulation is very important in the application of engineering seismology. Strong motion generation areas(SMGA) have been mentioned as an important source parameter for high frequency strong motion simulation, and were identified as having a different asperity distribution from traditional source inversion results. The site correction method using the Empirical Transfer Function(ETF, Huang et al., 2017) for stochastic finite fault simulation was applied in northwestern Taiwan for the 1999 Chi-Chi earthquake as a high frequency simulation. Except where the traditional inverted asperity model was used, random asperity distribution models were tested in Huang et al.(2014). In this study, different methods of generating random asperity models following Japan’s Recipe(NIED, 2009) are used for the same event to check nearby fault responses for randomly selected SMGAs. The ShanChiao fault is the most important fault system in northern Taiwan owing to the likelihood that it could generate an earthquake that would directly hit the urban Capital area. Finally, this study will try to identify potential ground shaking levels for the Shanchiao Fault system. These simulation results could help with a preliminary plan for disaster prevention or with building design problems in the future.