摘要
根据库仑破裂准则研究了1997年玛尼Mw7.6和2001年可可西里Mw7.8地震间的静态及黏弹性库仑应力的迁移。计算结果表明:静态库仑应力和黏弹性库仑应力均不超过0.005 MPa,小于典型的应力触发阈值0.01MPa;玛尼地震对可可西里孕震区应力状态的改变影响甚弱,震后造成的下地壳和上地幔的应力迁移效应对2001年可可西里地震的影响也甚弱;静态库仑应力和黏弹性库仑应力的迁移效应对可可西里地震无明显的触发作用,可能是随距离衰减相对较缓的动态库仑应力触发了可可西里地震。
The contribution of postseismic relaxation to the induced Coulomb stress and its comparison with that of static Coulomb stress changes imparted by 1997 Mw 7.6 Manyi earthquake were investigated. The results show that standard deviation of combined static and viscoelastic Coulomb stress changes and their means are not larger than 0. 005 MPa,which is less than typical triggering value 0.01 MPa, indicating there was no obvious triggering effect on 2001 Kokoxili earthquake caused by static and viscoelastic Coulomb stress imparted by 1997 Manyi earthquake. Stress redistribution due to postseismic relaxation of lower crust or upper mantle didn＇ t dramatically affect stress environment around the hypocenter of 2001 Kokoxili earthquake. It might be that the dynamic Coulomb stress decaying more slowly than those other two which offered the contribution to triggering the 2001 Kokoxili earthquake.
出处
《大地测量与地球动力学》
CSCD
北大核心
2009年第1期11-14,共4页
Journal of Geodesy and Geodynamics
基金
国家自然科学基金(40574006
40874923
40721001)
地震预测研究所基本科研业务专项(0207690201)
国家公益地震行业科研主项(200808080)
中国科学院动力大地测量学重点实验室基金(L04-02)
