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用等效质量-系统模型,即一种修改了的有限差分方法来解决波在地表断面的传播问题。点力源作用在下部地表上,观测下转角和上转角产生的合成绕射波,观测的波同阶跃高度 H 和波长λ的比值也有关。根据时距曲线的倾角确定波的性质,然后用粒子的轨迹运动对此进行证明。波的超前部分是下地表上的直达瑞利波、穿过下部转角的瑞利波、由峭壁表面上转角反射的瑞利波,由直达瑞利波在下转角绕射产生的 SV 波和在上部表面上通过整个地表的瑞利波等。穿过阶跃的瑞利波的最大幅度随阶跃高度呈指数衰减:exp(-0.1H/λ),本文提出了一些关于转角处绕射的看法。
Use the equivalent mass-system model, a modified finite difference method, to solve the wave propagation problem at the surface cross-section. The point source acts on the lower surface and observes the synthetic diffracted waves produced at the lower and upper corners. The ratio of the observed wave height H to the wavelength λ is also related. The wave nature is determined from the dip of the time-distance curve, which is then demonstrated by particle trajectory. The leading part of the wave is the direct Rayleigh wave on the lower surface, the Rayleigh wave passing through the lower corner, the Rayleigh wave reflected by the corner on the cliff surface, the SV wave generated by the direct Rayleigh wave diffraction at the lower corner, Surface through the entire surface of the Rayleigh waves and so on. The maximum magnitude of a Rayleigh wave that crosses a step decreases exponentially with the step height: exp (-0.1H / λ). This article presents some observations about diffraction at a corner.