This study estimated strong motion generation area parameters and simulated the strong ground motion of the 2 August 2019 (Mw 6.9) intraslab earthquake and a hypothetical plate boundary earthquake (Mw 8.7) using the strong motion records of the 11 August 2019 (Mw 5.1) plate boundary earthquake with the empirical Green’s function method. We first estimated the strong motion generation area that reproduced the strong ground motion during the Mw 6.9 intraslab earthquake, and conducted a rough estimation of the scaling parameters to see the impact of these parameters to the performance of the synthetic waveform reproduction. We also adjusted the stress drop ratio parameter (C) for some station records, which is sensitive to waveform amplitude. We then modeled the strong motion generation area of the Mw 8.7 hypothetical plate boundary earthquake using the Mw 5.1 plate boundary earthquake and the Mw 6.9 intraslab earthquake as the element events. The estimated peak ground acceleration values from the empirical Green’s function simulation was compared with the conventional ground motion prediction equation. The comparison provided simulated acceleration level excited by a hypothetical Mw 8.7 that may occur in the future. The variability of simulated ground motion in terms of methods, source type as the element event, and rupture directivity effect was confirmed.
Keywords: Simulation, Strong Ground Motion, Peak Ground Acceleration, Ground Motion Prediction Equation, Empirical Green’s Function Method.