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《Chinese Journal of Geophysics》 1989-03
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SEISMIC TOMOGRAPHY OF THE CHINESE CONTINENT AND ADJACENT REGION

LIU FU-TIAN WU HuA LIU JIAN-HUA HU GE(Institute of Geophysics, Acadcmia Sinica Beijing)QU KE-XIN LI QIANG(Institute of Geophysics, Stare Scismological Bureau. Beijing)  
In this paper,the three-dimensional velocity images beneath the Chinese continent and adjacent regions are reconstructed using P-wave travel time residuals of regional and distant earthquakes recorded by the Chinese seismic networks and ISC.The main results are as follows:1.The velocity images display clearly the lateral heterogeneity of the crust and upper mantle beneath the Chinese continent and adjacent regions, which persists down to at least 1100 km deep.The correlation between the velocity image of the upper mantle and the known surface geological feature can be traced down to a depth of 110km.Below 220 km this correlation is hardly seen.2.The velocity images at depths of 45-0km and 45+0km show clearly that the crust of the Chinese continent is divided into two parts approximately by the 102.5°E longitude.3.The velocity image at a depth of 110 km shows that velocity anomalies appear in block patterns.Comparing the image to the tectonic map of China,we find that the Yangtze para-platform and the Tarim platform correspond to high velocity zones,the Sino-Korean paraplat-form appears mostly as a low velocity anomaly,the South China fold system is a low velocity zone.Note that a dumbbell-shaped east-west trending high-velocity zone exists along the Himalayas at the southern margin of the Tibetan block.4.The velocity image at a depth of 220 km shows that low-velocity zones of the asthenos-phere exist under many areas in the Chine.se continent.Similar to the velocity images of 45-0km and 45+0km,the images of 400 km and 600 km also indicate that a strip of about 200 km wide near 102.5°E divides the Chinese continent into two tectonically different parts.This means that the tectonic differences between the eastern and western part of the-Chinese contnent may exist in the whole upper mantle.
【Fund】: 国家自然科学基金
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