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应用包含在小波变换系数中的信号偏振信息 ,提出了一种确定单台三分向记录图中 P波和 S波震相的小波变换方法 .主要的思路是寻找地震信号在不同尺度下小波变换系数的显著特性 .通过对小波变换系数主成分的分析 ,得到不同尺度下的 P波和 S波识别因子 ,进而形成确定 P波和 S波初至的定位函数 .通过对模拟资料和实际地震资料的分析 ,认为由小波变换方法形成的定位函数具有一定的抗噪声能力 ,在精确识别 P波和 S波初至方面是非常有效的 .本文首先介绍了小波变换的基本概念和详细方法 ,然后应用小波变换对实际资料进行处理 ,并给出了研究结果 .
Based on the signal polarization information contained in the wavelet transform coefficients, a wavelet transform method is proposed to determine the P-wave and S-wave phases in a single tridimensional record. The main idea is to find the wavelet transform of the seismic signal at different scales The significant characteristic of the coefficients.According to the analysis of the principal components of the wavelet transform coefficients, the identification factors of P-wave and S-wave at different scales are obtained, and then the locating functions for determining the first arrival of P-wave and S-wave are obtained.Based on the simulation data and actual seismic data , It is considered that the localization function formed by the wavelet transform method has a certain anti-noise ability and is very effective in accurately identifying the first arrival of the P wave and the S wave.This paper first introduces the basic concepts and detailed methods of wavelet transform, and then applies Wavelet transform to deal with the actual data, and gives the research results.