关键词: 山西, 断陷盆地, 盆地形成机制, 数值模拟, 有限元

Abstract: To illustrate quantitatively the formation mechanism of the rightstep faults, an ela-sto-visco-plastical three-dimensional model with a discontinuous pre-existing buried fault is presented and solved numerically by a general total initial strain procedure. Body force and localized upward force at the model base as well as a rightlateral couple acting beneath the upper crust are required to develop horizontal tensional stress above the buried fault with a direction perpendicular to the long axis of these basins.

Key words: Shanxi, En-echelon graben, Mechanics of graben, Numerical modelling, Finite element