基于能量比的Curvelet阈值迭代面波压制

利用Curvelet变换压制面波的效果受面波与有效波在Curvelet域重叠程度影响。实际应用中，Curvelet变换并不能完全分离面波与有效波。鉴于此，提出一种基于能量比的Curvelet阈值迭代面波压制方法，利用面波与有效波在频率、速度、方向上的特征差异，将有效波与面波在Curvelet域进行不同频带的多次分解；在不同尺度和方向上，根据面波与有效波的分布特征，采用不同的阈值进行多次迭代。实际应用效果表明，相对于传统面波压制方法，本文方法可更彻底地分离面波与有效波，获得高品质去噪资料。

A Curvelet threshold iteration method based on energy ratio for surface-wave suppression

The surface-wave suppression with the Curvelet transform is affected by the surface-wave and effective wave overlapping in the Curvelet domain.In the practice,the Curvelet transform cannot completely separate surface waves from effective waves.Therefore this paper proposes a Curvelet threshold iteration method based on energy ratio for surface-wave suppression.Using their characteristic differences in the frequency,velocity,and direction,effective waves and surface waves in different bands are decomposed in the Curvelet domain for many times.In different scales and angles,multiple iterations with different thresholds are carried out based on the distribution characteristics of surface waves and effective waves.According to our applications,the proposed method achieves better surface-wave separation and suppression than conventional methods.