地震失稳的滑动弱化模型的有限元分析

本文采用有限元方法,对直立的、无限长的二维走滑断层上的地震不稳定性的滑动弱化模型进行分析,研究断层参数对失稳的影响,从理论上探索当断层强、弱区均有弱化现象时,断层破裂的前兆信息,进而分析摩擦应力弱化规律与地震预报的关系,讨论失稳前后位移场、应变场和应力场的演变过程。

ANALYSIS FOR SLIP-SOFTENING MODEL OF EARTHQUAKE INSTABILITY BY FINITE ELEMENT METHOD

In this paper, the slip-softening model of earthquake instability on a strike-slip vertical fault with infinite length has been analysed by the finite element method. The effects of fault parameters on instability and precursors have been researched when there is softening phononous on both stiff and soft regions of fault. Relations between softening low of frictional stress and earthquake prediction, have been analysed, The process of changes in displacement, strain and stress fields before and after instability has been discussed.