摘要
本文使用适配滤波频时分析技术首次对中国数字地震台网的中长周期面波记录进行处理,获得穿过东南地区的82条勒夫波频散数据.使用随机反演理论,获得了东南沿海地区4°×4°网格的纯路径频散数据.这些频散的周期为1.95—68.27s,弥补了长周期面波所不能分辨的浅层结构.在网格反演的基础上,使用Harkrider的面波及演程序得出了中国东南地区的地壳和上地幔结构,浅部可分辨到1km,深部可达80km.在分辨率保证的前提下得出东南地区深至80km的三维剪切波速度结构.
In this study, Love wave dispersion data of 82 selected paths crossing south-east China are determined by applying the MF-FTAN technique to CDSN mid-long period data. The technique (Matched-filter frequency-time analysis) improves the resolution of dispersion measurement over a broader period range with reduced systematic errors. An improved grid dispersion inversion is proposed to extract pure-path disperson curves in each 4°×4° grid from the mixed-path dispersion data for a more extensive study. The lateral distributions of Love wave group velocities in the south-east China for 30 periods in the range of 1.95 to 68.27 seconds have been obtained. On the basis of the grid dispersion inversion, we use Rodi's surface wave inversion program to inverse for the three dimensional shear wave velocity structure to a depth of 80km. A detailed discription on the lateral heterogeneities in the crust and upper mantle of south-east China has been provided.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第5期584-593,共10页
Chinese Journal of Geophysics
基金
国家自然科学基金
中国科学院基金
关键词
地震
面波
地壳构造
中国
东南地区
Digital surface-wave data, Mixed-path dispersion, Pure-path dispersion, Three dimensional velocity structure, South-east region of China.
