Validation of 3D basin model for earthquake ground motion simulation using seismic interferometry

研究了地震干涉测量技术在大盆地三维横波速度模型验证中对长周期地震动估计的适用性。我们在东京都地区和骏河湾地区进行了长期的微震观测，以估计相互关系。从相关性中提取格林函数的表面波。三维模型是根据表面波的群速度层析分析修正的。模拟了一次中等地震中观测到的地面运动，发现修正模型比以前的模型能更好地重建观测到的地面运动特征。

Applicability of seismic interferometry in validating 3D S-wave velocity model of a large basin for estimation of long-period ground motion was investigated in this study. We conducted long-term microtremor observation in Tokyo Metropolitan area and Suruga bay area for estimation of cross correlations. Surface waves of Green’s function were extracted from the correlations. The 3D model was modified from group velocity tomographic analysis of the surface waves. We simulated earthquake ground motions observed during a moderate event and found that the observed ground motion features were reconstructed better with the revised model than the previous model.