基于二维小波变换的面波分离技术研究

Research on Surface Wave Separation Technique Based on 2-D Wavelet Transformation

针对面波干扰的特点,应用二维小波变换把地震信号变换到时间、频率、空间和波数的四维函数中,然后充分利用有效波信号与面波在时间域、频率域、空间域和波数域方面的差异进行面波分离,通过分解与重构,得到分离面波后的地震信号,实际资料的处理结果表明:本文方法在叠前面波分离方面具有良好的效果。

According to characteristics of surface wave disturbance,this paper transforms the seismic signal into a 4- D function related to time, frequency, space and wave number by means of 2-D wavelet transformation, then we can separate surface by making full use of the differences between signal and surface wave in such four aspects as time field, frequency field, space field and wave number field. Through decomposition and reconstruction, we can get a seismic signal of surface wave separation. Real data show that it has a good result for prestage surface wave separation.