地盤振動

[CS10-44] Estimation of S-wave velocity model in Yumigahama, Tottori, based on microtremor array and aftershock observation

〇Shohei Yoshida¹, Takao Kagawa², Tatsuya Noguchi², Takeshi Nishimura² (1.Ohsaki Research Institute, Inc., 2.Tottori University)

Keywords:The 2000 western Tottori earthqauke, S-wave velocity structure model, Site amplification characteristics, microtremor observation, aftershock observation

From the questionnary seismic intensity calcurated from questionnary survey after the 2000 western tottori earthquake, it was confirmed that the seismic intensity was large in a local area of 0.5km wide × 3.0km long at the northen end of Yumigahama Peninsula in Tottori prefecture. In this study, we estimated S-wave velocity strcture model based on microtremor and aftershock observations in order to investigate the cause of large seismic intensity. From These results, we confirmed that the sub-surface sturcture around the large seismic intensity area is inclined.