Fig. 9

Peak ground velocity (PGV) for periods of 5–30 s. a Event A occurred on August 4, 2019, b Event B occurred on January 3, 2020, and c Event C occurred on February 6, 2020. Detail source parameters described in Events a–c of Table 3. The top and bottom panels are the synthetic and observed PGVs, respectively. PGVs were evaluated by calculating the vector sum of three-component filtered seismograms at the F-net and MeSO-net stations. Plotted focal mechanisms are the optimal solutions of the 3D CMT inversions for the corresponding events. The JIVSM bedrock depths are illustrated in Figs. 1, 7 and 9, 10 and 11