基于GPS数据的青藏块体东北缘地壳活动分析  

Crustal activity analysis of northeast margin of Qinghai-Tibet block based on GPS data

作　　者：王瑞[1] 赵康年[1] 唐红涛[2] 杨振杰[1] 牛明昂 WANG Rui;ZHAO Kangnian;TANG Hongtao;YANG Zhenjie;NIU Mingang(Department of Geological Engineering,Qinghai University,Xining 810016,China;The Second Crust Monitoring and Application Center,CEA,Xi’an 710054,China)

机构地区：[1]青海大学地质工程系,青海西宁810016 [2]中国地震局第二监测中心,陕西西安710054

出　　处：《青海大学学报（自然科学版）》2018年第1期88-93,106,共7页Journal of Qinghai University(Natural Science)

摘　　要：为了研究青藏块体东北缘的主应变率、最大剪应变率、面膨胀率等地壳应变场特征,通过对多个站点的GPS区域网连续观测,获取了2009—2013年GPS水平运动速度场数据的解算结果,并在研究区域选取了两个GPS剖面,分析其应变积累特性。结果表明:GPS的水平运动速率由NE向正E向逐渐减小,主要是受到了祁连块体、阿拉善块体及鄂尔多斯块体的阻挡而改变了物质的运移速度;2010期与2012期的主应变率与最大剪应变率主要分布于循化南山断裂西段、日月山断裂北段、祁连北缘断裂带北段,面膨胀率圧性高值区主要分布在循化南山断裂西段。日月山断裂北段及祁连北缘断裂东段均表现为圧性为主,兼具左旋走滑的相对运动特征。In order to study the crustal strain field accumulation characteristics of Qinghai-Tibet block,the principal strain rate,the maximum shear strain rate and the surface expansion rate were investigated through continuous observation in multiple sites of the GPS regional network,and the results of 2009-2013 year GPS horizontal velocity field data were obtained,and GPS profiles were selected in the study area.The results showed that the horizontal movement rate of GPS decreased gradually from NE to E,mainly due to the Qilian block and Alashan block and Erdos block and changed the migration velocity of substance.The high value areas of principal compressive strain rate and the maximum shear strain rate in 2010 and 2012 stages distributed at the western section of Xunhua Nanshan fault,the north Riyue mountain faults and the northern section of the northern margin of Qilian fault zone.The high value areas of compressibility surface expansion distributed at the western section of Xunhua Nanshan faults.The relative movement features were mainly compression and both left-lateral strike-slip of the north Riyue mountain faults and the eastern section of the northern margin of Qilian fault zone.

关 键 词：GPS速度场 断裂剖面 应变场 应变积累 

分 类 号：P231.5[天文地球—摄影测量与遥感]