用GPS资料分析陇县-宝鸡断裂带构造应力场特征  

Analysis of Tectonic Stress Field Characteristics of Longxian-Baoji Fault Zone Based on GPS Data

作　　者：戴洪宝 唐红涛[2] DAI Hongbao;TANG Hongtao(School of Environment and Geomatics Engineering,Suzhou University,49 Mid-Bianhe Road,Suzhou 234000,China;The Second Monitoring and Application Center,CEA,316 Xiying Road,Xi’an 710054,China)

机构地区：[1]宿州学院环境与测绘工程学院,安徽省宿州市234000 [2]中国地震局第二监测中心,西安市710054

出　　处：《大地测量与地球动力学》2021年第4期413-418,共6页Journal of Geodesy and Geodynamics

基　　金：安徽省教育厅自然科学项目(KJ2013B290);安徽省高校优秀拔尖人才项目(gxgnfx2020107);宿州学院重点科研项目(2019yzd01,2020yzd03);宿州学院校级质量工程(szxy2020hhkc02)。

摘　　要：借助GPS数据作为边界条件,运用有限元对陇县-宝鸡断裂带及其邻区进行位移场与应力场数值模拟,分析该地区现今地壳活动与构造应力场的分布特征。结果表明:1)陇县-宝鸡断裂带与岐山-马昭断裂南端渭河盆地的张应力较弱;2)鄂尔多斯地块西南缘与陇县-宝鸡断裂带接壤的SE向条带的节点应力性质、方向与陇县-宝鸡断裂带一致,显示出平行于断裂带SE走向的张性活动特征;3)最大主应力表明,陇西地块及秦岭构造区具有较高强度的张性应力;4)第二主应力表明,陇县-宝鸡断裂带南端与秦岭构造区接壤地区南侧的SEE向压性应力显著。We use GPS data as boundary conditions to simulate the displacement and stress fields of the Longxian-Baoji fault zone and its adjacent area by the finite element method,and analyze the distribution characteristics of the current crustal activity and the tectonic stress field in this area.The results show that:1)The tensile stress of Weihe basin at the southern of Longxian-Baoji fault zone and Qishan-Mazhao fault is weak.2)The stress properties and direction of the border zone between the southwestern margin of the Ordos block and Longxian-Baoji fault zone are consistent with the Longxian-Baoji fault zone,which shows the characteristics of the tensive activity paralleled to the strike of the fault zone.3)The maximum principal stress shows that Longxi block and Qinling mountains tectonic zones present strong tensile stress.4)The second principal stress shows that the compressive stress of SEE direction is significant on the southern side of the border zone between the southern of the Longxian-Baoji fault zone and Qinling mountains tectonic zone.

关 键 词：GPS速度场 陇县-宝鸡断裂带 应力场 数值模拟 

分 类 号：P228[天文地球—大地测量学与测量工程] P313[天文地球—测绘科学与技术]