数值流形方法及在川滇地区地壳运动研究中的应用

• 作 者: 许才军 易长荣 陈庭
• 机 构: School of Geodesy and Geornatics, Wuhan University, 129 Luoyu Road, Wuhan 430079, China
• 出 处: 地球空间信息科学学报（英文版）
• 发表日期: 2008年3期
• 关键词: numerical manifold method continuous deformation discontinuous deformation analy

The numerical manifold method (NMM) can calculate the movements and deformations of structures or materials.Both the finite element method (FEM) for continua and the discontinuous deformation analysis (DDA) for block systems are special cases of NMM. NMM has separate mathematical covers and physical meshes: the mathematical covers define only fine or rough approximations; as the real material boundary, the physical mesh defines the integration fields. The mathe-matical covers are triangle units; the physical mesh includes the fault boundaries, joints, blocks and interfaces of different crust zones on the basis of a geological tectonic background. Aiming at the complex problem of continuous and discontinuous deformation across the Chinese continent, the numerical manifold method (NMM) is brought in to study crustal movement of the Sichuan-Yunnan area. Based on the GPS velocity field in the Sichuan-Yunnan area, a crustal strain and stress field is simulated and analyzed. Moreover, results show that the NMM is a more suitable method than DDA in simulating the move-ment of the Sichuan-Yunnan area. Finally, a kind of mechanism of crustal motion in the Sichuan-Yunnan area is discussed in the paper.