The Chengxian-Xiji profile of DSS in Tianshui earthquake area is from Chengxian country of province Gansu to Xiji country of Ningxia Hui Autonomous Region,the total length of profile is 242km with 4 shots.The crust can be divided into four layers,sedimentary,upper crust,middle crust and down crust.The deep of Moho increase gradually from south to north,and it rises in the vicinity of Tianshui-Qinan.The low velocity layer (LVL) was found in the top of middle crust.The northern fringe fault of western segment of Qinling Mountain across to the profile is a over-crust fault and it is a boundary fault between Qilian and Qinling Geosyncline.
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李清河,郭建康,周民都,魏德晴,范兵,侯晓钰.成县-西吉剖面地壳速度结构[J].地震工程学报,1991,13(s1):37-43. Li Qinghe, Guo Jiankang, Zhou Mindu, Wei Deqing, Fan Bing, Hou Xiaoyu. THE VELOCITY STRUCTURE OF CHENGXIAN-XIJI PROFILE[J]. China Earthquake Engineering Journal,1991,13(s1):37-43.