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利用地震面波研究中国地壳结构
引用本文:冯锐,朱介寿,丁韫玉,陈国英,何正勤,杨树彬,周海南,孙克忠.利用地震面波研究中国地壳结构[J].地震学报,1981,3(4):335-350.
作者姓名:冯锐  朱介寿  丁韫玉  陈国英  何正勤  杨树彬  周海南  孙克忠
作者单位:1. 国家地震局地球物理研究所 2. 成都地质学院 3. 陕西省地震局 4. 中国科学院地球物理研究所
摘    要:本文利用地震面波频散资料进行反演, 得到了中国各地区地壳结构的层状模型。中国地壳可以划分为青藏、蒙古、华北、华南和塔里木等五个大陆块体, 其频散曲线和地壳层状结构是彼此不同的.一般可以用沉积层、花岗岩层和玄武岩层来代表, 后四个区在上地幔和玄武岩层中的波速值比较接近.青藏和华北地区在地壳中的平均波速值较低, 地壳结构的纵横向变化显著, 康腊面不是稳定而明显的速度间断面, 某些部位上存在着低速层, 这两个地区的地震活动之所以十分强烈, 与上述地壳深部构造有直接关系.其余三个地区的地壳显示了类似稳定地台的某些特征.中国沿海地区的地壳可以大致以长江口为界分成南北两部分, 分属于华北和华南地壳.中国地壳厚度在东部为32——40公里, 青藏高原60——70公里.沉积层在塔里木盆地最厚, 达11公里, 其他地区一般为3——8公里. 


CRUSTAL STRUCTURE IN CHINA FROM SURFACE WAVES
Abstract:In this paper, numerical inversion from surface waves dispersion gives the layered structures for some regions in China.The results of this work show that the crust in China can be divided into five continental major blocks: Tibetan Plateau, Mongolian Plateau, North China, South China and Tarim Basin. In general, there are three layers (sediments, granitic and basaltic layers) in the crust. The seismic wave velocities in the upper mantle and basaltic layer for the latter four regions are almost the same. The average velocities in Tibet and in North China are lower than the other regions and the lateral heterogeneity is quite obvious. The Conrad interface is not a steady and sharp discontinuity. In some parts low velocity layers do exist, the high seismicity in these two regions is directly related to the deep crustal structure. The crusts of the other three regions show some characteristics of stable platform. The coastal crust can be divided into two regions by the mouth of Yangtze River, belonging to the crusts of North and South China respectively.The crustal thicknesses in China are 32-40 km. for East China, 60-70 km. for Tibet. The thickest sedimentary layer is found in the Tarim Basin amounting to about 11 km., but for other regions it is generally 3-8 km. 
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