地震断层滑动对地质形变的测绘研究

Surveying and Mapping of Geological Deformation by Seismic Fault Slip

传统断层自主剖分技术进行地震断层滑动对地质形变的测绘研究时,未考虑走滑位移量、倾滑位移量和张开位移量对地质形变测绘研究的影响,无法对差异断层转动角下的地质形变情况实施有效测绘,提出基于矩形位错模型的地质形变的测绘研究方法,采用矩形断层位错模型通过点源位错公式,获取地震断层滑动时地质形变的走滑位移量、倾滑位移量和张开位移量;基于地震矩形断层三维滑动对地表产生的位移进行测绘时,获取各位移量同地面形成的三维位移场,采用二维高斯-勒让德求积计算断层三维位移场转动形成的地表位移,实现地质形变的测绘研究。实验结果表明,所提方法可对不同矩形断层转动角下的地质变形情况进行准确测绘,实际应用价值高。

The influence of the slip displacement, the dip displacement and the opening displacement on the geological deformation study is not considered when the traditional fault autonomous segmentation technology is carried out in the surveying and mapping of geological deformation by seismic fault slip. It is impossible to effectively map the geological deformation under the rotation angle of the differential fault, and put forward the model based on the rectangular dislocation. The method of surveying and mapping geological deformation by using the formula of the point source dislocation by the rectangular fault dislocation model to obtain the strike slip displacement, the dip displacement and the opening displacement of the geological deformation when the seismic fault slips, and to obtain the displacement and the ground shape when the displacement of the groundsurface is measured by the three-dimensional slip of the seismic rectangle fault. The three-dimensional displacement field formed by the two-dimensional Gauss-Legendre quadrature is used to calculate the surface displacement formed by the rotation of the three-dimensional displacement field of the fault, so as to realize the surveying and mapping of the geological deformation. The experimental results show that the proposed method can accurately survey the geological deformation under different rotation angles of rectangle faults and has high practical application value.