2023年Mw7.8トルコ・シリア地震の高周波地震動生成域と断層形状との関係

抄録

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.