基于含可变因子广义S变换的瑞雷面波频散曲线提取方法  

THE METHOD OF RAYLEIGH WAVE DISPERSION CURVE EXTRACTION BASED ON GENERALIZED S-TRANSFORM WITH VARIABLE-FACTORS

作　　者：周竹生[1] 杨朋凯[1] 陈友良[1] 

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083

出　　处：《物探化探计算技术》2012年第5期518-522,499,共5页Computing Techniques For Geophysical and Geochemical Exploration

摘　　要：面波频散曲线的提取是面波资料处理的关键。鉴于S变换和广义S变换不能全时段兼顾频率分辨率和时间分辨率的缺点,提出了含可变因子广义S变换进行瑞雷面波频散曲线的提取方法。可变因子的引入使得高斯窗函数的宽度随频率发生变化时具有目的性,而不是简单地随着频率的增大而变窄。该方法可以有针对性地改善局部频段(特别是低频段和高频段)的频率分辨率及时间分辨率。通过理论模型和实际资料试算表明:含可变因子广义S变换提取面波频散曲线的方法具有可行性和实用性。The key step of surface wave data processing is to extract its dispersion curve.As the frequency resolution and time resolution can not be taken into account by S-transform or the generalized S-transform for the whole time samples simultaneously,a new method by using the generalized S-transform with variable-factors to extract dispersion cure of transient Rayleigh wave is present.With the variable-factors,the width of gaussian window versus frequency varies as expected,rather than simply narrows as frequency increasing.This method can improve the frequency resolution and the time resolution of the local bands with purpose,especially the low and high frequency bands.The results of theoretical model testing and real data trials show that the method of surface wave dispersion curve extraction based on generalized S-transform with variable-factors is feasible and practical.

关 键 词：瑞雷面波 S变换 广义S变换 可变因子 频散曲线 

分 类 号：P631.4[天文地球—地质矿产勘探]