华北地区近期地壳水平运动的非震负位错反演  

ASEISMIC NEGATIVE DISLOCATION INVERSION OF RECENT HORIZONTAL CRUST MOVEMENT IN NORTH CHINA

作　　者：张希[1] 江在森[1] 张晓亮[1] 王双绪[1] 

机构地区：[1]中国地震局第二地形变监测中心,西安710054

出　　处：《大地测量与地球动力学》2002年第3期40-45,共6页Journal of Geodesy and Geodynamics

基　　金：国家重点基础研究<大陆强震机理与预测>项目 (G19980 40 70 3 )资助

摘　　要：利用一种经初步改进了的非震负位错模型和华北地区 1991～ 2 0 0 0年的GPS观测资料 ,反演华北地区的地壳水平运动 ,以获取构造块体和边界断裂活动状况以及应力应变的积累部位及强度。其结果显示 :(1)华北地区整体性向东偏南运动 ,冀鲁北部各块体正东向速率相对较大 (11.4～ 12mm/a) ;(2 )阴山 燕山与河套断陷 鄂尔多斯 晋冀鲁间近EW NWW向边界两侧左旋相对运动明显 ,导致 1.0～ 2 .8mm/a的边界锁定 ,且东段大于西段 ,以压性为主 ;(3)太行断块东西两界的北东向断裂带呈 0～ 1.9mm/a的拉张锁定 ,左旋为主 ,其中晋获断裂锁定量最高 ;(4)唐山 沧东断裂北段、益都北西段及郯庐断裂中南段呈 0 .9～ 3.1mm/a右旋拉张锁定 ,其中益都北西段锁定量最高 ;(5 ) 14条断裂中有 12条不同程度地阻碍块体相对运动 ,近 10年来有相当于Ms4 .8～ 6 .1的能量积累 ,其中燕山与冀鲁交界西段最高 ,阴山与鄂尔多斯东部交界次之 ,均表现为压性 ;晋获、郯庐断裂较弱 (张性 ) ;(6 )从块体及断层活动方向来看 ,燕山、冀鲁交界西段与唐山 沧东断裂交汇区 ,阴山、鄂尔多斯东部交界与汾渭断裂交汇区 。Using an improved aseismic negative dislocation model, we inverse 1991～2000 horizontal crust movement measured by GPS in North China, in order to acquire activity of tectonic blocks and their boundary fault and the position and strength of stress and strain acumulation. The results show that: (1)North China totally moves towards east trending south, the eastward rate of northern Ji Lu blocks are relatively larger(11.4～12 mm/a);(2)Two sides of nearly EW NWW boundary between Yinshan Yanshan and Hetao Ordos Jin Ji Lu appeare obviously left lateral that leads to a lock of 1.0～2.8 mm/aandthe motion in its east section was larger than that in its west section, and the baundary is majoring in compression; (3)The northeastward faults of Taihang block's eastern and western boundaries showed tensional lock of 0～1.9 mm/a(mainly left lateral), the highest value is along Jinhuo fault; (4) The northern section of Tangshan Cangdong fault, together with northwestern section of Yidu fault and middle southern section of Tanlu faults show 0.9～3.1 mm/a right-lateral tensional lock, and Yidu section's locking magnitude is the largest; (5)12 among 14 faults hampered the block's relative movement to different degree; in about 10 years, brought energy accumulation equal to about an earthquake of \%M\%s 4.8～6.1, among these faults in the western boundary between Yanshan and Ji Lu the energy is highest and in the boundary between Yinshan and eastern Ordos blocks is the second, both indicating compression; those in the Jinhuo and Tanlu faults are the third and appearing tensional; (6)From the direction of block and fault motions, the meeting region of Yanshan and Ji Lu's western boundary and Tangshan Cangdong fault, the meeting region of Yinshan and eastern Ordos's boundary and Fenwei fault, have larger possibility of accumulating stress strain to some degree.

关 键 词：非震负位错模型 反演 GPS 水平运动 华北地区 全球定位系统 

分 类 号：P227[天文地球—大地测量学与测量工程]