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为了获得具有合适波速的模型材料,文中讨论了可以定量控制模型材料波速的双层粘合模型。将两种波速不同的模型材料板按不同的厚度比例粘合在一起,只要入射波波长比板的厚度大得多,就可以使粘合模型的波速在这两种材料的波速值范围内变化。应用双层粘合模型,以1:20万的比例,实验模拟了文[3]给出的北京、天津和唐山地区地壳结构。在模拟地震图上观测到了对应于文[3]所给出的四组震相。模拟地震图与唐山余震地震图在一定程度上相似。
In order to obtain model materials with suitable wave velocities, a two-layer adhesion model that can quantitatively control the wave velocity of model materials is discussed. Two kinds of model materials with different wave velocities are glued together according to different thicknesses. As long as the wavelength of the incident wave is much larger than the thickness of the plate, the wave velocity of the bonded model can be changed within the range of the wave velocity of the two materials . Applying a two-layer bonding model, the crustal structure in Beijing, Tianjin and Tangshan given by [3] is simulated experimentally at a ratio of 1: 200000. In the simulated seismogram, four phases corresponding to those given in [3] are observed. The simulated seismogram and the Tangshan aftershock seismogram are somewhat similar.