汶川8.0级地震对鄂尔多斯块体西南缘断裂体系影响的数值模拟

利用有限元方法及静态位移解理论,采用前人反演的汶川8.0级地震破裂过程时空参数,定量计算分析汶川地震对鄂尔多斯块体西南缘断裂体系的影响.数值计算表明,具逆冲右旋性质的汶川地震,在汶川-宝鸡-线以东产生顺时针的位移扰动场,以西产生逆时针的位移扰动场,这与该分界两侧附近的活断层整体走滑方向相一致.水平剪切应力场的局部极值区...

Numerical Simulation of Influence of the Wenchuan Ms8.0 Earthquake upon Faults in the Southwest Margin of the Ordos Block

Based on inversed parameters of Wenchuan MS8.0 earthquake,using the FEM and Static Displacement Analytical Solution Theory,this paper analyzes the influence of the great earthquake on faults in southwestern margin of Ordos block.The numerical result shows that the Wenchuan MS8.0 earthquake,which is the type of thrust with right-lateral component,leads to clockwise disturbance displacement field to the east of the line of Wenchuan-Baoji and anticlockwise disturbance displacement field to the west,which is consist with slide direction of the active faults near the line.The distribution of horizontal shear stress extreme values is consisted with seismicity in the fault zones to the southwest of Ordos block during the year after the great earthquake.The numerical result also indicates that the Wenchuan earthquake may enhance the seismicity in the Haiyuan and Xiangshan-Tianjingshan fault zones.The region with higher shear stress value and lower seismicity may be the area that we should pay close attention to in the future.