基于瑞雷面波群速度频散反演上海地区S波速度结构  

Inversion of S-wave velocity structure based on Rayleigh surface wave group velocity dispersion in Shanghai

作　　者：王仁涛 董一兵[3] 冯策 潘国勇 夏波 蔡旭荣 WANG Rentao;DONG Yibing;FENG Ce;PAN Guoyong;XIA Bo;CAI Xurong(Shanghai Earthquake Agency,Shanghai 200062,China;Shanghai Sheshan National Geophysical Field Observation and Research Station,Shanghai 200062,China;Hebei University of Economic&Business,Shijiazhuang 050000,China)

机构地区：[1]上海市地震局,上海200062 [2]上海佘山地球物理国家野外科学观测研究站,上海200062 [3]河北经贸大学,石家庄050000

出　　处：《地震地磁观测与研究》2023年第6期27-31,共5页Seismological and Geomagnetic Observation and Research

基　　金：上海佘山地球物理国家野外科学观测研究站研究室课题(项目编号:2023SSY02)。

摘　　要：利用上海测震台网固定台站地震面波数据记录,通过多重滤波法提取周期为8-20s的瑞雷面波群速度频散曲线,反演得到台站下方介质一维速度结构。结果表明:对于整个上海地区,其剪切波速度横向不均性不明显,在相同深度,每个台站S波速度差异较小,上地壳平均速度约为3.6 km/s,中下地壳平均速度约为3.8 km/s、4.1 km/s。Using the seismic surface wave data recorded at the fixed stations of the Shanghai Seismic Network,the dispersion curve of Rayleigh surface wave group velocity with an 8-20 s period is extracted by the multiple filtering method,and the one-dimensional velocity structure under the stations is inverted.The results show that for the entire Shanghai region,the lateral velocity heterogeneity is not obvious,and the difference in S-wave velocity at each station is small at the same depth.The average velocity of the upper crust is about 3.6 km/s,and the average velocity of the middle and lower crusts is about 3.8 km/s and 4.1 km/s,respectively.

关 键 词：面波频散 瑞雷面波 S波速度结构 

分 类 号：P315.7[天文地球—地震学]