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《Progress in Geophysics》 2006-01
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Three-dimensional crustal velocity structure in the northeastern margin of the Qinghai-Tibetan plateau

ZHOU Min-du~(1,2),ZHANG Yuan-sheng~(1,2),SHI Ya-liu~2,ZHANG Shu-xun~2,FAN Bin~2(1.Lanzhou Base of Institute of Earthquake Prediction,CEA,Lanzhou 730000,China;2.Lanzhou Institute of Seismology,CEA,Lanzhou 730000,China)  
This paper presents the three-dimensional crustal seismic wave velocity structure in the region 32°~40°N,100°~108°E reconstructed through seismic tomographic inversion.We use 38 052 arrival time data of,,P_m,S_m,P_n and S_n phases recorded from 2 032 earthquakes with M≥1.5 occurred from 1980 to 2000 and the Moho interface topography data from deep seismic sounding.The 3-D tomographic image clearly reveals that the crust structure of this region consists of four layers.The top layer(about 0~3 km) has a velocity gradient about 0.2 s~(-1) that corresponds to the sediments.The second layer(about 3~17 km) is the upper crust with a velocity gradient about 0.1 s~(-1) at top and relative large lateral velocity variation as well as lower velocity blocks at bottom.The third layer(about 17~36 km) is the middle crust with velocity gradient 0.03 s~(-1).The lower crust forms the fourth layer(about 36 km-Moho),which is thick in the west and thin in the east.The thickness of this layer gradually reduces from the Qinghai-Tibetan plateau to the Erdos platform and the Yangtze paraplatform with different velocity gradient at different location.
【Fund】: 国家重点基础研究发展规划项目(95-13-02-02)资助;; 中国地震局兰州地震研究所论著编号:LC20060001
【CateGory Index】: P541
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