Generation Process of Strong Ground Motion Considering Three-Dimensioal Source Fault Geometry and Underground Structure

该项目的重点是两个重要的“三维效应”有关的强地面运动的产生在地震期间：三维几何形状的震源断层和三维速度结构模型。本文提出了一种新的运动学震源反演分析方法，可以从观测到的强震记录中估计断层的时空滑动分布以及未知的断层几何形状。将目前全国范围内的三维地壳速度结构模型模拟的理论绿色函数与用地震干涉技术推导的台站间观测绿色函数进行了比较。考虑到板块界面的三维几何形状，估计了2011年东北地震的4个强动发生区组成的震源模型。

This project focuses on two important “three-dimensional effects” related to strong ground motion generation during earthquakes: the three-dimensional geometry of the source fault and the three-dimensional velocity structure model. New kinematic source inversion analysis method isdeveloped to estimate the spatiotemporal slip distribution together with unknown fault geometry from observed strong motion records. Theoretical Green’s functions simulated from the present nation-wide three-dimensional crustal velocity structure models are compared with the observed inter-station Green’s functions deduced by the seismic interferometry technique. The source model composed of four Strong Motion Generation Areas of the 2011 Tohoku earthquake is estimated considering the three-dimensional geometry of the plate interface.