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应用射线追踪方法进行震源参数和速度结构联合反演，对宁夏吴忠、灵武地区地壳中上部Ｐ波速度结构进行了研究。其结果与目前该区域地震定位所用的速度模型差异较大，与穿过研究区的人工地震剖面相比，随深度的增加两者的速度值趋于一致
The ray tracing method was used to carry out joint inversion of source parameters and velocity structure to study the P-wave velocity structure in the middle and upper crust of Wuzhong and Lingwu areas in Ningxia. The result is different from the velocity model used in the current earthquake location in the region. Compared with the artificial seismic section passing through the study area, the velocity values of the two sections tend to be consistent with the increase of the depth