静态应力触发中影响库仑应力变化的参数敏感性分析  

PARAMETERS SENSITIVITY ANALYSIS OF COULOMB STRESS CHANGE IN STATIC STRESS TRIGGERING

作　　者：周宇明[1] 单斌[2,3] 熊熊[2] 

机构地区：[1]中国科学技术大学地球与空间科学学院,合肥230026 [2]中国科学院测量与地球物理研究所,武汉430077 [3]中国科学院研究生院,北京100049

出　　处：《大地测量与地球动力学》2008年第5期21-26,共6页Journal of Geodesy and Geodynamics

基　　金：中国科学院知识创新工程重要方向性项目(KZCX3-SW-153);国家自然科学基金(40574011)

摘　　要：基于弹性位错理论,分析了库仑应力计算中断层的有效摩擦系数、区域构造应力场的最大主应力大小及方向对震后库仑破裂应力场变化的影响。结果表明,在静态应力触发的研究中,这些参数对同震库仑应力变化场存在不同程度的影响。如构造应力场主应力轴方向的改变直接影响接收断层的最优化破裂面,对计算接收断层面上正应力和剪应力变化将产生直接影响,不仅改变库仑应力变化的大小,还明显改变库仑应力变化增强区及影区的空间分布等。On the basis of on the elastic dislocation theory, we analyzed influences of the effective friction factor in the fault for the calculation of the Coulomb stress and the magnitude and birextion of the maximum principle stress of and regional stress field on the coseismic Coulomb stress changes. The results show that the above mention parameters have the influences on the coseismic Coulomb stress changes significantly to different extent. First, the Coulomb stress change is most sensitive to the regional stress direction, because the regional stress direction chan- ges directly affect the optimum rapture planes. Secondly, Coulomb stress change is modestly sensitive to the of effective friction factor, because the friction decides the weight of normal stress change in Coulomb stress change calculation. At last, our results are insensitive to the regional stress amplitude, because the amplitude of Coulomb stress change is much smaller than that of regional stress field.

关 键 词：静态应力触发 库仑应力变化 区域应力场 有效摩擦系数 最优化破裂面 

分 类 号：O374[理学—流体力学]