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在分析和评价各种应力资料的基础上 ,从三维空间分析应力图象的差异性 ,并从边界条件和岩石圈介质的不均一性出发 ,提出华北地块构造应力双层模式。然后用有限元方法进行了模拟 ,计算结果与实际资料相当吻合 ,即以 10km左右深度的滑脱面为分界 ,其下存在一个比较一致的以近水平的北东 北东东的最大主压应力为特征的挤压应力场 ,而滑脱面之上的浅部地块内主应力方向的一致性很差 ,总体上反映出多方向伸展的格局。计算得到的剪应力分布有助于对大震震源位置的预测。
Based on the analysis and evaluation of various kinds of stress data, the difference of stress images is analyzed from the three-dimensional space. Based on the boundary conditions and the heterogeneity of lithospheric media, the tectonic stress bi-level model of North China block is proposed. Then the finite element method is used to simulate the results. The calculation results are in good agreement with the actual data. That is to say, with a depth of about 10km as the boundary, there is a relatively uniform maximum compressive stress of NE near NE Squeeze the stress field, while the consistency of the principal stress direction in the shallow block above the slip surface is poor, which generally reflects the pattern of multi-directional stretching. The calculated shear stress distribution is helpful for the prediction of the focal position of a large earthquake.