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《Northwestern Seismological Journal》 1990-02
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THE CRUSTAL VELOCITY STRUCTURE IN TIANSHUI—LIXIAN REGION

Li Qinghe, Min Xiangyi, Guo Jiankang, Wei Deqing, Hou Xiaoyu (Earthquake Research Institute of Lanzhou, SSB, Gansu, China)  
The line has twice laid out to sound the crustal velocity structure in Huixian-Lixian region by means of industrial blasts of Changba Lead-Zinc Mine in 1984 and 1985, especially, the explosion of 500 ton charge on Dec. 30, 1985 supports us to interprete a large scope crustal velocity structure. The parts of DSS data obtained by DSS Cooperation Group, SSB, in 1986 were supplemented.The velocity structure in Tianshui-Lixian region are following:1.The average thickness of sedimentary layer is about 2.5km, average velocity is 4km/s (P-wave).2.The average thickness of crust is 43.6km, average velocity is6.2km/s.3.There are five layers from surface to Moho. There is a low-velocity layer in depth 24-29 km. The shape of base is rising and falling.A fault in Lixian was found.4.The joint inversion of P-wave and S-wave was put forward, and P-wave velocity structure and S-wave velocity structure were obtained, The average velocity ratio of crust is 1,732,
【Fund】: 地震科学基金
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