华北1999—2009年水平形变应变场特征  

CHARACTERISTICS OF HORIZONTAL DEFORMATION-STRAIN FIELD IN NORTH CHINA FROM 1999 TO 2009

作　　者：郭良迁[1] 薄万举[1] 杨国华[1] 郭赫[1] 

机构地区：[1]中国地震局第一监测中心,天津300180

出　　处：《大地测量与地球动力学》2011年第3期15-19,共5页Journal of Geodesy and Geodynamics

基　　金：天津市应用基础研究项目(08JCZDJC18900);"十一五"国家科技支撑课题(2006BAC01B02-02-03)

摘　　要：根据华北地区GPS观测数据计算了华北活动块体的运动速度和应变率,以及块体边界带的活动速率和应变率,研究了华北块体的运动和应变率特征,以及边界断裂带的应力作用特征。形变揭示出华北亚板块从西向东运动方向由东向偏转为南东向,NE-NNE向断裂带呈现右旋,NWW-EW向断裂带呈现左旋。各个次级块体的主压应变应力轴方向存在一定的差异。边界断裂带现今应变应力状态页不相同,郯庐断裂带北段和山西断陷带以压性为主,具有应变能积累显示,但是应变率相对较小,应变能积累缓慢。On the basis of the GPS data of Chinese Crustal Motion Network in North China,the velocities and the strain rates on blocks in North China were calculated,as well as these on block＇s boundary fault zones.The North China subplates＇ motion and features of the strain rate,and also the features of the strain stress of the block＇s boundary fault zones were studied.The results show that the direction of the west-east movement field of North China subplates turns from east to southeast,the NE-NNE fault zone is of right-lateral strike slip activity and the NWW-EW fault zone is of left-lateral strike slip activity.The directions of the principal compressive strain axis of the sub-blocks are different.The present strain of the block＇s boundary fault zones indicates that the force of the north part of Tanlu fault zone and the Shanxi downfaulted zone is mainly compressive,the strain energy is accumulating,but the strain rate is small,the speed of the accumulation is slow,so we should pay attention to the variation in future.

关 键 词：块体运动 应变应力场 断裂带 应力作用 蕴震分析 

分 类 号：P315.726[天文地球—地震学]