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压制面波等干扰波，提高信噪比，是地震数据处理中的一个重要内容。本文提出一种全新的方法，利用波动方程正反向延拓进行滤波。该方法基于这样一种思想：将他表记录通过波动方程正向延拓至一定深度，在此深度上，面波等干扰波分布于浅层，而有效反射保持在原来的层位，将浅层的波场置零后，再反向延拓记录至地表，达到消除干扰的目的。本文对该方法的原理及计算方法都进行了比较详尽的讨论，实际资料处理表明，该方法是正确和可行的。
Suppression of surface waves and other interference waves to improve signal to noise ratio is an important part of seismic data processing. In this paper, a new method is proposed, which utilizes the forward and backward continuation of the wave equation for filtering. The method is based on the idea that the record of his table is extended forward to a certain depth through the wave equation. At this depth, the disturbing waves such as surface waves are distributed in the shallow layer while the effective reflection remains in the original layer, Layers of the wave field zero, then the reverse extension record to the surface, to eliminate the interference. In this paper, the principle and calculation method of this method are discussed in more detail. The actual data processing shows that this method is correct and feasible.