Source Models and Synthetic Ground Motions for M8 Scenario Earthquakes in the Ryukyu Subduction Zone

This dataset provides finite-fault source models and synthetic ground motion parameters for M8 scenario earthquakes in the Ryukyu subduction zone. It accompanies the study on non-ergodic ground motion modeling in Taiwan using 3-D physics-based simulations with recipe-based source characterization. The source models (srcmod) comprise 192 files representing 96 unique fault rupture realizations, each discretized into 9,016 subfaults. The models systematically explore source variability through combinations of three asperity configurations (single, two, and three asperities), six asperity-to-fault area ratios (0.17–0.40), four rupture directivities (landward/seaward combined with up-dip/down-dip), and two rupture velocities (2.4 and 3.0 km/s). Each source model is paired with two 3-D velocity structures: HH3D (Huang et al., 2014) and KC3D (Kuo-Chen et al., 2012). The synthetic ground motions (synGM) contain 1,728 files of ground motion parameters computed at 4,950 station locations using the traction-image finite-difference method (Zhang et al., 2012). Each of the 192 source models is simulated under nine source time function durations (2–10 s), yielding spectral acceleration (SA) values at periods of 1.0, 3.0, and 5.0 seconds (RotD50). Detailed file format descriptions, naming conventions, and the mapping between source models and ground motion files are provided in the accompanying README files.