摘要
多重滤波方法已被证明在分析面波的频散特性时是一种有效而快速的方法。本文用单个台站的单次地震事件记录,应用MFT(Multiple Filter Technique)方法提取了内华达地区的面波频散曲线并分析了其特征,认为其具有大陆基振型瑞利波频散曲线的典型特征。还利用广义反透射系数法快速计算了瑞利面波频散曲线,尤其是基阶瑞利波相速度及群速度频散曲线;并且在由振型叠加方法合成的理论地震图的基础上,通过比较理论频散曲线和MFT方法得到的频散曲线,研究了多重滤波的可靠性。
Multiple filter analysis method （MFF） has been proved efficient for computing the dispersion curve of surface wave. In the article ,with the data of earthquake event in Nevada area recorded by single station, MFF is used to derive the dispersion curve of Nevada area, and its characteristic are deeply analyzed. The result shows that the dispersion curves in Nevada area own the character of the dispersion curves of the typical mainland fundamental Rayleigh mode. Furthermore, theoretical dispersion curve of Rayleigh wave is calculated by generalized reflection - transmission method, and the phase velocity curve and group velocity curve of the fundamental Rayleigh mode are compared with that derived from the synthetic seismogram calculated by the modal sunnation method with MFF. Two results coincide better in the interested frequency range, showing MFF is reliable.
出处
《西北地震学报》
CSCD
北大核心
2006年第1期46-50,共5页
Northwestern Seismological Journal
关键词
瑞利波
多重滤波
群速度
频散曲线
Rayleigh wave
MFT（Multiple Filter Technique）
Group velocity
Dispersion curve
