用远震接收函数反演上海及其邻区地壳速度结构

Crust Velocity Structure in Shanghai and Its Neighboring Area Inversed by Teleseismic Receiver Function

通过提取江苏、浙江及上海数字地震台网台站远震记录的接收函数，反演了这些台站下方地壳的S波速度结构，同时计算出了地壳的厚度及泊松比。初步分析发现，该地区莫霍面起伏不大，江苏地区地壳厚度大约是30km，地壳中存在4～5km厚的低速夹层，位于地面以下15～22km之间。浙江地区地壳内部不存在低速区，并且莫霍面深度自北向南逐渐加深。

Using some teleseismic events collected from the earthquake stations of Jiangsu, Zhejiang, Shanghai digital networks, we obtained the receiver functions of the stations, inversed the crustal S-wave velocity structure under these stations, and calculated the depths of Moho and poisson＇ s ratios. The elementary result reveals that in this area the depth of Moho varies a little. In the Jiangsu area the crustal thickness is about 30 km, between 15-22 km underground there exists a low velocity area about 4-5 km thick. In the Zhejiang area, there isn＇ t low velocity area and the crust becomes deep from north to south.