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《Chinese Journal of Geophysics》 1991-06
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SEISMIC TOMOGRAPHY OF SICHUAN

SUN RUO-MEI(Centre for Analysis and Prediction, State Seismoloqical Bureau, Beijing 100036)LIU Fu-TIAN LIU JIAN-HUA (Institute of Geophysics, Academic Sinica, Beijing 100101)  
New information of velocity images of the crust and upper mantle of Sichuan area has been obtained from tomography using P arrival time data of Sichuan seismic network. The results are:1.Velocity image of the section of 20- km depth is correlate with the tectonic characters of crust surface, reflecting lithological distribution, showing block structure; Longmen mountains, Xianshui river main faults and s'outh-north tectonic belt and Sichuan basin splendly are showed on the pictures. The Huayin mountain covered fault clearly displayed on the velocity images from the section of depth 20 km down to the section of depth 85 km.2.The velocity images of sections 50± km reflect the topography of Moho interface: The Moho depth of Sichuan basin, Huei conty basin, Chen conty basin are less 50 km, the velocity of top of their upper mantale is 8.1km/s. From 104°E the Moho depth of north section of Longmen mountains is the same with Sichuan basin, middle south section similar to the west part of Sichuan. Kangdian earth's axis is' transition zone of thickening of Sichuan area from. east to west. .3.Lithosphere of Yangzi metaplatform is thicker than the active fold areas.4.It seems that there is link between seismic activity and velocity structure; Hypocen-ters of strong earthquakes M≥6.0 since 1930 mostly located at the velocity gradient belt, of 20" km depth image, and down to the 50+ km image distributed in the low velocity area and it's edges where in velocity between crust and upper mantle gradual change pattern appears and asthernosphere bumps.
【Fund】: 国家自然科学基金
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