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一、前言在地表下不同深度发生的地震,经过不同的介质和路径传播,在地球表面上反映出来的地面运动是千差万别的。在地面运动的研究中,我们往往把地面上的每一点看成一个能在三维空间(三个平动方向)中运动的质点。由于地面质点之间运
I. INTRODUCTION Earthquakes that occur at different depths below the earth’s surface are propagated through different media and paths. The ground motions reflected on the earth’s surface are very different. In the study of ground motion, we often consider each point on the ground as a particle that can move in three-dimensional space (three translational directions). Due to transport between ground particles