Results of seismic deep reflection, high resolution refraction and shallow artificial seismic exploration indicate that the fault on the northern bank of the Weihe River is composed of two branches: one is the Yaodian-Zhangjiawan fault and the other is the Chuanzhang-Zuitou fault. The 22 km long Yaodian-Zhangjiawan fault of E-W strike starts from Chenjiagou, via Yaodian town, Qianpai village, Bill village, Wujia town and Zhangjiawan, to Jiajiatan. The 15 km long Chuanzhang-Zuitou fault striking near E-W starts from Chuanzhang, via Mabel, to Zuitou. The Weihe fault is a basement and upper crust fault and the reflection layers of TQ, TN, TE and Tg are ruptured at depth of about 15 km. In deep part the Weihe fault and the secondary fault form a Y-shaped structure or a synthetic low angle intersection. The Weihe fault is a listric normal fault, which has obvious structural characteristics of a reverse-drag normal fault and a normal-drag normal fault within a depth of 1000 m, and also has the characteristics of syngenetic sediment. The Weihe fault is one of the faults which control the basin sediment, and is the boundary fault between Xi’an depression and Xianyang salient. The fault depth decreases gradually from west to east. Its deep part intersects with the Lintong-Chang’an fault at the intersection of Weihe River, Jing River and Bahe River, and its shallow part connects with the Weinan-Jingyang fault. The seismic exploration result indicates that no fault exists on southern bank of the Weihe River.
