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最近一段时间里,随着波场定量分析方法的运用,迫使人们不断对以几何地震学公式为基础的许多近似计算方法,提出了修改和更加明确的说明。尤其像文献中指出的那样,当震源靠近介质的分界面布置时,便会产生波场的一系列分量(非单一波),这些波在几何地震学范畴内是无法描述的。不过,这些波只有在震源和接收器之间具有足够大的水平距离时才会形成。这里我们最感兴趣的是,当球面波“法向”入射。若震源和接收器处在界面同一法
In recent times, with the application of wavefield quantitative analysis methods, many modifications and clearer explanations have been proposed for many approximate calculation methods based on geometric seismological formulas. In particular, as pointed out in the literature, a series of components of the wave field (non-monochromatic waves) are produced when the source is placed close to the interface of the medium and these waves can not be described in terms of geometric seismology. However, these waves develop only when there is a sufficiently large horizontal distance between the source and the receiver. What we are most interested here is that when the spherical wave “normal” is incident. If the source and receiver are in the same interface method