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以跨断层水准实测资料为基础,分析2011-03-11日本东部Mw9.0大震前后首都圈地区(114°~119°E,39°~41°N)地壳垂向变形特征。通过构建首都圈地区三维有限元模型,初步探讨跨越不同几何结构断层的测线所表现出的变形特征的动力学成因。结果表明:1)首都圈地区跨断层水准资料表现出群体性变形特征,反映相同的断层运动性质;2)NNE-NE向断层的上盘相对下盘垂向下降,NW向断层上盘相对下盘同样垂向下降,表征着首都圈地区NNE-NE、NW向断层受到不同程度的张性应力作用;3)数值模拟给出的不同方向跨断层测线的垂向变化结果同样表现出与实测结果较为一致的断层正断运动性质,即断层上盘相对下盘垂向下降;4)日本Mw9.0大震造成首都圈地区近E-W向的张性应力是产生首都圈地区跨断层水准资料群体性变化的主要原因。
Based on the cross-fault leveling data, the crustal deformation of the crust in the Capital Region (114 ° -119 ° E, 39 ° -41 ° N) before and after the Mw9.0 earthquake in eastern Japan from 2011-03-03 was analyzed. By constructing the three-dimensional finite element model of the metropolitan area, the dynamic causes of the deformation features exhibited by the survey lines crossing different geometrical faults are discussed. The results show that: 1) the stratigraphic level data in the metropolitan area show the characteristics of mass deformation and reflect the same fault movement properties; 2) the hanging wall of the NNE-NE fault vertically descends relative to the lower plate; The plate also descends perpendicularly, indicating that the NNE-NE and NW strike faults in the metropolitan area are subjected to different degrees of tensile stress. 3) The vertical variation of cross-fault lines in different directions given by numerical simulation also shows the same results The result is a more consistent faulting movement, that is, the hanging wall of the fault is vertically descended relative to the lower plate. 4) The strain near EW in the metropolitan area caused by the Mw9.0 earthquake in Japan is caused by the cross-fault leveling data The main reason for sexual change.