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首次采用重叠球迭代重建层析成像技术，结合两点快速射线追踪，对渭河断陷盆地地壳速度变化进行了三维层析成像研究．通过理论模拟计算检验了陕西省台网观测系统的监控效能，并利用该台网的地震观测数据对渭河断陷盆地的地壳速度进行了层析反演成像．研究结果表明：位于泾阳以北的铜川、耀县一带，近南北方向伸展存在一高速区，铜川附近速度值最高；位于商县、兰田的西南方向，存在一长约１００ｋｍ、宽约５０ｋｍ的低速带，带内有两个相距５０ｋｍ的最低速度区；历史强震震中主要分布在高速区的边缘或较高速度区；秦岭南缘的东西两部分速度横向不均匀明显
For the first time, the overlapped ball iterative reconstruction tomography was used in combination with two rapid ray tracing to study the three-dimensional tomography of the crustal velocity in the Weihe rift basin. Through the theoretical simulation calculation, the monitoring effectiveness of the observational system in Shaanxi Province was tested and the crustal velocity in the Weihe rift basin was analyzed by the seismic observation data. The results show that there is a high-speed zone in the vicinity of Tongchuan and Yao County in the area north of Jingyang, and the highest speed is near Tongchuan. In the southwest of Shangxian and Lantian, there is a high-speed zone with a length of 100km and a width of 50km Low speed zone with two lowest velocity zones 50 km apart. The epicenter of the historical strong earthquakes mainly distributes at the edge of the high velocity zone or in the higher velocity zone. The lateral velocity of the east and west parts of the southern edge of the Qinling Mountains is unevenly and horizontally obviously