Wave field continuation can remove much of the energy which propagates along the surface, such as direct waves, ground roll and some random noises.

把波场沿深度外推可以消除与地表有关的“噪音” ，如直达波、面波、声波及在表层传播的随机噪音。

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Effective suppression of ground roll is vital to converted wave seismic data processing, but the methods of suppressing ground roll, as linear noise is usually dissatisfactory.

转换波资料的信噪比较低，有效信号往往被面波干扰淹没，因此需要对面波进行压制，但是将面波作为线性干扰的压制方法很难得到好的效果。

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