太平洋板块俯冲对中国大陆的影响  

The Underthrust of Pacific Plate to Eurasian Plate and Its Effect on Chinese Mainland

作　　者：李延兴[1] 张静华[1] 李智[1] 郭良迁[1] 张中伏[1] 

机构地区：[1]中国地震局第一监测中心,天津300180

出　　处：《测绘学报》2006年第2期99-105,共7页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金项目(40474036)

摘　　要：在中国大陆及周边地区ITRF2000速度场的基础上,建立欧亚板块整体旋转与线性应变运动模型,得到中国大陆及邻区的局部形变场,分析此形变场发现东北块体和华北块体东部地壳存在一致的向西或北西西向运动,平均运动速率东北为2.9 mm/a,华北东部为1.4 mm/a,推测这是太平洋板块向欧亚板块俯冲的影响。其影响范围仅限于东北和华北块体,影响较大的是120°E以东和40°N以北地区。并分析太平洋板块俯冲对中国大陆影响的表现形式和形成机制。Based on the ITRF2000 velocity field of Chinese mainland and its surrounding areas, the Eurasian plate motion model with rotation in its entirety and linear strain is established, and the local deformation field in Chinese mainland and its adjacent areas is obtained. It has been discovered from the analysis on the deformation field that there is a consistent westward or NWW-trending motion with an average velocity of 2.9 mm/a in the Northeast China and 1.4 mm/a in the eastern part of North China. By inference we conclude that it might be affected by the underthrust of Pacific Plate to Eurasian Plate. The affected areas are only limited in the Northeast China and North China, especially the areas to the east of 120°E and to the north of 40°N. The phenomenon and mechanism of underthrust from Pacific Plate to Eurasian Plate, as well as its effect on the Chinese mainland are analyzed in the paper

关 键 词：欧亚板块的运动模型 中国大陆形变场 太平洋板块俯冲 对中国大陆的影响 

分 类 号：P227[天文地球—大地测量学与测量工程]