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威德斯(Widess)于1957年～1958年早期工作得出结沦,地层顶部和底部的地震反射之间的延迟时仅仅根据波形形状就可以求解,假定地层比λ_b/8厚(或者假如存在噪音时,是λ_b/4)的话。这里λ_b 是由地层的地震速度计算
The Widess work from 1957 to early 1958 concludes that the delay between seismic reflections at the top and bottom of the formation can be solved based on the shape of the wave, assuming that the formation is thicker than λ_b / 8 (or, if present When noise is λ_b / 4). Here λ_b is calculated from the seismic velocity of the formation