重庆地区三维P波速度结构成像研究

利用重庆数字地震台网目录记录到的2009-01~2018-10重庆地区的地震数据资料，采用双差层析成像方法得到重庆地区的上地壳三维速度结构模型。研究表明，浅层地壳速度结构与地质构造的分布呈现出较高的相关性：石柱地区褶皱基底缺失，断裂两侧速度结构差异较大；华蓥山基底断裂两侧速度结构差别明显，可能与两侧结晶基底的深度和物性有关；巫溪断裂的高速区可能与地幔深处的物质上溢有关。

Research on 3D P-wave Velocity Structure Imaging in Chongqing Area

Using seismic data of Chongqing area from January 2009 to October 2018 recorded by the Chongqing digital seismic network directory, we use the double-difference tomography method to obtain the three-dimensional velocity structure model of the upper crust in Chongqing. The results show a high correlation between the shallow crustal velocity structure and the distribution of geological structures. The fold base of the Shizhu area is missing, and the velocity structure on both sides of the fault is quite different. The difference in velocity structure between the two sides of the Huayingshan basement fault may be related to the depth and physical properties of the crystalline basement on both sides. The high-speed area of the Wuxi fault may be related to the material overflow in the deep mantle, affecting the stress distribution and seismic activity in the earth’s crust.