新疆伽师地区地应力的GPS损伤模拟研究

ON SIMULATION OF EARTH STRESS IN JIASHI AREA,XINJIANG,BY DAMAGE MECHANICS MODEL WITH GPS DATA

摘要:

采用几何损伤理论和方法推导了地壳存在不同方向和大小的断层时的有效应力的公式,讨论了利用几何损伤理论来分析和计算地壳中存在不连续断层的理论和方法,同时对中国新疆伽师地区的地应力变化用几何损伤理论和方法结合该地区的GPS资料进行了数值计算研究,通过比较计算结果与1997年1月至1998年12月发生在该地区的M_S≥5.0地震活动可以看出,新疆南部的中强地震活动区主要在应力场变化激烈的地区.

Abstract:

The effective stress formula of the earth crust having the faults with different direction and size is deduced by geometry damage theory and method,and the theory and method to analyze and compute the uncontinuous faults in the earth crust by geometry damage theory is discussed.At the same time,the earth stress variation in Jiashi area,Xinjiang,is computed by geometry damage theory with GPS data.Comparing the computed results with M_S>5.0 earthquake activities in the region from Jan.1997 to Dec.1998,it is seen that modern strong earthquakes in the south of Xinjiang mainly occurred in the region where the stress field variation is very large.