凹陷地形对Rayleigh面波传播影响的研究

A study on the effect of depressed topography on Rayleigh surface wave

利用局域离散波数法,研究了地形对近地表爆炸源产生的Rayleigh面波的影响,展示了Rayleigh面波穿越地形过程中波的传播进程,研究了穿越地形前后Rayleigh面波能量、频率的变化,并讨论了该变化与地形起伏程度的关系,从中可见,Rayleigh面波穿越地形时,激发出新的体波和面波,并且越陡的地形对面波传播的阻碍性越强,且面波高频部分能量损失的越多.

Using the local discrete wave-number method we study the effect of topography on Raleigh surface wave produced by a explosion source near the surface. Firstly we analyze the propagation character of Rayleigh surface wave in the course of passing topography, compare the changes of its energy and frequency before and after passing topography. Then, we discuss the relation between the change and topographical steepness. It can been seen that the Rayleigh wave produces new scattering body wave during passing the topography with energy reducing and high frequency vanishing. Moreover, the steeper the topography is, the more energy reduces and the more frequency vanishes.