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本文首先将一般剪切位错点源表示成四种基本点位错的组合,断层面倾角和滑动系数仅与组合系数有关.利用将三维动力学问题化为两维的处理方法,将每一基本点源问题化成求解位移函数的轴对称问题,最后将人工透射边界的处理方法同有限差分结合起来,提出一种简便、节省的计算理论地震图的方法.利用这种方法获得了四种基本点位错源的典型近场理论地震图,并初步讨论了近场地面运动的若干特征,表明浅源地震近场地面位移中震相不能分离,且点位错源在近场产生大小相当的水平与垂直位移.本文的方法可用于研究复杂的近场地震波传播问题.
In this paper, the source of general shear dislocation is first expressed as the combination of four basic point dislocations, and the fault dip and sliding coefficient are only related to the combination coefficient.Using the method of solving the three-dimensional dynamic problem into two-dimensional, The basic point source problem is to solve the axisymmetric problem of displacement function. Finally, combining the processing method of artificial transmission boundary with finite difference, a simple and saving method of calculating theoretical seismogram is proposed. By this method, Point mismatch of typical near-field theoretical seismograms and some characteristics of the near-field ground motion are discussed preliminarily. It shows that the seismic facies can not be separated in the near-field ground motion of shallow earthquakes, Horizontal and vertical displacement.The method in this paper can be used to study the propagation of complex near-field seismic waves.