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利用陕西及邻省区域地震台网的观测数据，采用重叠元迭代重建层析成像技术，结合两点快速射线追综，对渭河断陷盆地地壳的Ｓ波速度进行了层析反演成像．并利用前期Ｐ波速度的研究结果，计算了该地区地壳的 Ｖ_ｐ／ Ｖ_ｓ分布．研究结果表明：（１）Ｓ波速度分布两个地区存在强烈的横向不均匀性，其一是陕晋交界的合阳、永济地区，二是铜川、泾阳地区，它们都位于不同构造单元交汇地带，差异运动显著，是新老地层交错的地区．（２）历史强震震中主要分布在Ｓ波的高速区及边缘地带。（３）在淳化、耀县、泾阳之间存在Ｖ_ｐ／Ｖ_ｓ高值区，最高达２．１．
Based on the observation data of the seismological stations in Shaanxi and its neighboring provinces, the overlapped-element iterative reconstruction tomography and the rapid tracing of two points are used to perform tomographic inversion of the S-wave velocity in the crust of the Weihe rift basin. The Vp / V_s distribution of the crust in the area was calculated by using the results of previous P wave velocities. The results show that: (1) S-wave velocity distribution has strong horizontal inhomogeneity in both regions, one of which is Heyang and Yongji at the junction of Shanxi and Shanxi, the other is Tongchuan and Jingyang, which are located at the intersection of different tectonic units Strip, significant differences in movement, is the old and new strata staggered areas. (2) The epicenter of historical strong earthquakes is mainly distributed in the high-speed area and the edge of S-wave. (3) There are V_p / V_s high value areas between Chunhua, Yao County and Jingyang up to 2.1.