华北地区最近几年水平形变场的含义与讨论  

Meanings and Discussion on the Horizontal Deformation Fields in North China in Recent Years

作　　者：杨国华[1] 韩月萍[1] 杨博[1] 张风霜[1] 

机构地区：[1]中国地震局第一监测中心,天津300180

出　　处：《山东科技大学学报（自然科学版）》2009年第6期1-8,共8页Journal of Shandong University of Science and Technology(Natural Science)

基　　金："十一五"国家科技支撑计划重点项目"强震监测预报技术研究"课题(2006BAC01B03-01-01);地震科学基金项目"强震对大陆远场地壳水平形变及地震活动的影响"课题(A07066)

摘　　要：在整体无旋转基准的基础上,采用了以提取低频应变信息为主的连续应变模型,按三个时段(1999—2001年、2001—2004年和2004—2007年)处理了华北地区400余个GPS测站复测资料,获取了三个时段的相对运动速率及其相应的主应变率场。结果表明:1999—2007年华北地区水平形变场存在比较明显的差别,不同时段的结果在空间上的表现形式不一样;三个时段的结果与应力场及其动态变化相辅相成——第一时段着重反映背景应力场与昆仑山地震孕震过程中远场的动态应力场共同作用的结果,第二时段体现了昆仑山地震后应力场调整所导致远场变化的结果,第三时段不但体现背景应力场的主导作用,同时还可能影射应力场有所加强的成分。On the basis of datum without rotation,the authors used continuous strain model focused on extracting low frequency strain information,and processed the repeated measurement data of more than 400 GPS stations in North China for 3 periods of times（1999—2001、2001—2004 and 2004—2007）,and obtained the results of relative movement velocities and the corresponding main strain rate fields.The results suggest： there existed obvious differences of the horizontal deformation fields in North China during 1999—2007 and the results of different time periods had different representation forms on space; The results of three time periods were corresponding to the strain fields and the dynamic changes, that is, the result of the first time period mainly reflected the cooperation of the background strain field and dynamic far field during the pregnant period of Kunlun Mountain Earthquake,and the result of the second time period embodied the changing of the far field because of the adjustment after Kunlun Mountain Earth quake,then,the result of the third time period not only embodied the predominant function of the background field, but also probably reflected the fortified components of strain fields.

关 键 词：华北地区 水平运动与应变 动态特征 形变场 

分 类 号：P315.7[天文地球—地震学]