RELATIONSHIP BETWEEN HIGH-FREQUENCY MOTION GENERATION AREAS AND FAULT GEOMETRY OF THE 2023 Mw7.8 TURKEY-SYRIA EARTHQUAKE

The high-frequency (3–10 Hz) motion generation areas (HMGAs) of the 2023 Mw7.8 Turkey-Syria earthquake were estimated using the empirical Green’s function method. One of the HMGAs was located near the end of the southwestern segment, where the off-fault deformation was large. The other HMGA was located near the stepover. The edges of strong motion generation areas revised from Satoh (2023) were near the stepover, the bend, and the junction. These results show that off-fault damage and discontinuity in fault geometry generated high-frequency motion. This is identical to the features shown by numerical simulations for strike-slip earthquakes in previous studies.