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《Chinese Journal of Geophysics》 2003-06
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3D TOMOGRAPHY OF VELOCITY STRUCTURE IN THE UPPER CRUST BENEATH THE CHANGBAISHAN TIANCHI VOLCANIC REGOIN

ZHAO JINREN ZHANG XIANKANG YANG ZHUOXIN ZHANG CHENGKE WANG FUYUN ZHANG JIANSHI LIU BAOFENG DUAN YULING WANG SHUAIJUN Research Center of Exploration Geophysics, Chinese Seismdogy Bureau, Zhengzhou 450002, China  
We obtain P-and S-wave velocity tomography and V p/V S perturbation images at different depths beneath the Changbaishan Tianchi volcanic region by three-dimensional velocity structure inversion. The inversion is based on reflected waves from Moho recorded by the 3D seismic transmission observational system in the studied area. The result shows that the heterogeneity of velocity structure beneath the Tianchi volcanic region and its surrounding areas is closely related to the geological structure and existence of magma systems in the area. The obvious anomalous bodies of low-velocity P-wave and high V p/V S perturbation imply that these media are in a “softened and high-temperature” state. This is consistent with the result of wide-spread geothermal anomaly and low Q-value structure.
【Fund】: 国家基础研究 973项目 (G19980 40 70 2 );; 中国地震局“九五”重点项目 ( 95 -11-0 2 -0 1)资助 ;;中国地震局地球物理勘探中心论著编号RCEG 2 0 0 2 0 9
【CateGory Index】: P317
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