【摘要】 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。更多还原

【Abstract】 In order to get the modelling material which has a moderate velocity of waves, we have discussed a bimorphe model in which the wave velocity can be quantitatively controlled. Gluing the two modelling material plates which have diffrent velocities of waves in different proportions of thicknesses, we can change the wave velocity in the model in the range of the two component ones, if the wavelength of the incidence wave is much longer than the thickness of the plate. The crustal structure of Beijing-Tianjin-Tangshan region has been modelled with the scale of 1:200000 by the bimorphe model. Four sets of seimic phases corresponding to reference (3) have been observed in the modelling seismograms which are similar to the seismograms of the aftershock of Tang-shan earthquake.更多还原