中国大陆板内各块体及褶皱带形变状态的联合反演研究.docVIP

  中国大陆板内各块体及褶皱带形变状态的 联合反演研究  1 2  1*  5 10 15 20 25 30 35 40  （1. 山东科技大学测绘科学与工程学院，青岛 266590； 2. 贵州大学矿业学院，贵阳 550025） 摘要：构建联合反演模型，研究描述板内块体及褶皱带形变状态的运动-变形模型，利用多 年来积累的中国大陆内部的 GPS 数据和地震矩张量数据研究中国大陆块体（14 个构造块体） 的整体运动矢量和各块体间褶皱带缩短速率矢量及其滑动规律，并讨论其动力学意义。研究 结果表明：中国大陆的运动整体以北东向运动为主，西部为北北东向，东部为北东东向，西 部各亚板块或块体运动量值从约 28.5mm.a-1 到约 3.2mm.a-1, 东部则从约 8.3mm.a-1 到约 2.7mm.a-1，这样西部显示出的总体以大量值向北运动趋势，而东部则以较小量值向南或东 南蠕散的特征。西部各褶皱带变形远大于东部，西南部变形大于西北部，总体体现印度板块 北东向的推挤作用及南北带削减和吸收作用。特别，南北带、阿尔金断裂的左旋错动、华南 与华北之间左旋剪切等形变，基本表征了大陆内部褶皱带形变的总体特征和现今趋势。 关键词：GPS 数据；地震矩张量；联合反演模型；运动-变形模型；动力学意义 中图分类号：P228 Joint Inversion Research on the Strain Status of Each Block and Drape Zone in Chinese Continent Du Zhixing1, Zhangjun2, Wangyong1 (1. College of Geomatics,Shandong University of Science and Technology,Qingdao 266590; 2. Mining College, Guizhou University,Guiyang 550025) Abstract: A joint inversion method which is used to research the model of block movement and strain about strain status of drape zones is presented by this paper. According to multi-year GPS data and seismic moment tensor data of inner Chinese continent, the whole movement vectors, shortened velocity vectors of the drape zones and sliding rule between each block are researched, and their dynamics meaning is discussed. The below results can be obtained from this paper. The whole movement of Chinese continent is north-east direction. The detailed movement of west continent is north-north-east direction. However, of east continent is north-east-east direction. The quantitative values of movement of sub-plates or blocks in the west mainland approximately are from 28.5mm.a-1 to 3.2mm.a-1. And they are from 8.3mm.a-1 to 2.7mm.a-1 in the east continent. So the whole trend in the west continent has a big movement toward north, and in the east continent has a small movement toward south or southeast. The strain of west continent is far bigger than that of east, and the strain of southwest is bigger than that of the southeast. It is whole showed that