论文部分内容阅读
通过一系列的理论实验和实际数据处理,分析采用单台多重滤波法和双台互相关法提取面波群速度的误差.结果表明,面波群速度测量误差随震中距和周期的变化而变化.为了减少频散测量误差,需要选择合适的高斯滤波参数.高斯滤波参数应随周期的增大而减少,并随震中距的增大而增大.结合前人工作,本文提出了一个高斯滤波参数的经验选择公式.研究也表明,采用双台互相关法测量面波群速度,由于面波振幅谱变化更剧烈,测量中会产生更大的系统性误差,这时有必要利用瞬时周期修正提取的面波群速度频散.
Through a series of theoretical experiments and actual data processing, the error of extracting surface wave group velocity using single multi-filter method and two-stage cross-correlation method is analyzed.The results show that the error of surface wave group velocity measurement varies with epicenter distance and period In order to reduce the measurement error of the dispersion, we need to select the appropriate Gaussian filter parameters.The Gaussian filter parameters should decrease with the increase of the period, and increase with the increase of the epicentral distance.With the previous work, this paper presents a Gaussian filter The empirical choice formula of the parameters.The research also shows that the two-stage cross-correlation method to measure the surface wave group velocity, as the surface wave amplitude spectrum changes more intense measurement will produce greater systematic error, it is necessary to use instantaneous cycle correction Extracted surface wave group velocity dispersion.