It is known that along an interface between two isotropic halfspace satisfying the widely used in geophysical applications Wiechert condition, Stoneley waves may propagate with speed of propagation that is independent from frequency. A recent proof on non-existence of Stoneley waves in functionally graded (FG) plates with continuous transverse inhomogeneity may indicate that in real situations, when there is no abrupt change of material properties, the Stoneley waves arise less frequently than it can be supposed. The current analysis is targeted to elucidate the situation of vanishing Stoneley waves, when the initially abrupt interface between elastic layers starts to diffuse.

众所周知，沿着满足地球物理应用Wiechert条件广泛使用的两个各向同性半空间之间的界面，斯通利波可以以与频率无关的传播速度进行传播。关于连续横向不均匀的功能梯度（FG）板中不存在斯通利波的最新证据可能表明，在实际情况下，当材料特性没有突然变化时，斯通利波的出现频率比预期的要少。当前的分析旨在阐明当弹性层之间最初突然的界面开始扩散时，消失的斯通利波的情况。