深部剪切形变带对浅源地震的控制--立交模式有限元的模拟计算

CONTROLING OF DEEP SHEAR DEFORMATION BELT TO SHALLOW EARTHQUAKE--FINITE ELEMENT SIMULATING CALCULATION ON “STEREOSCOPIC MODEL”

摘要:

本文在“立交模式”的基础上,用三维粘弹有限元方法计算了几个简化的地质体模型,讨论了地壳下部的蠕滑断层对浅部断层活动的影响和对浅部应力场的调整和控制过程。结果表明,深部断层的蠕滑作用可使浅部应力场增强,井使得在特定方向,特定走向的断层内的应力加速积累或松弛。据此,本文解释了地震震中沿直线的迁移问题,同时也讨论了大地震原地重复发生的力学机制。

Abstract:

Based on the "stereoscopic model", we computed a few simplified geological models using 3-D viscoelastic finite element method in this paper, discussed the effect of deep creep fault on shallow fault activity in crust and the process of controled and adjusted shallow stress field by the deep fault. The results show that the stress field in shallow can be increased and the stress acumulation or slack can be accelerated in fixed direction and fixed trend fault by creeping function of deep, Based on above, we explained the migration problem of seismic epicentre along a straight line and discussed the mechanism of repeat occurrence of large earthquakes.