中国及其邻区地壳应力场数值特征的研究

Numerical Study on Stress Characteristic in China

讨论了利用地应力主方向和 GPS资料联合反演与之相关的地球动力学参数及数值模拟地壳应力场的方法 ,建立了中国及其邻区的四节点有限元模型 ,解决了有限元数值解算中节点位移不连续的问题。提出了在利用随机反演求得全局最优解基础上通过高斯 -牛顿法等局部迭代算法精化反演解的解算思想。其数值模拟解算获得的中国及其邻区的地壳应力场结果基本反映了该区的地壳应力场特征。

The joint inversion of some geodynamical parameters and numerical simulating the crustal stress field is presented in this paper. The four nodes quadratic finite element in Chinese area is constructed and the 'split node' technique is employed for introducing the fault parameters into the finite element computation. An inversion strategy of which the random inversion is employed to capture the global solution and local iteration method (i.e. Gauss-Newton method) is used to obtain final solution is proposed. The numerical results reveals the crustal stress characteristic in Chinese area.