富蕴地震前后震区应力场的光弹实验研究

PHOTOELASTIC TEST STUDY IN THE STRESS FIELD OF EARTHQUAKE AREA BEFORE AND AFTER THE FUYUN EARTHQUAKE

本文用光弹性实验方法,模拟分析了富蕴地震前后震区应力场特征。实验表明,在富蕴8级大震前,可可托海一二台断裂中部阿克赛依是最大剪应力集中区。打孔释放应力后,最大剪应力集中区向地震断裂南段和本区东部迁移。地震前后应力集中区与该区中强震的空间分布基本吻合。

This paper stimulates and analyses the characteristic of stress field in.earthquake area before the Fuyun earthquake by using the photoelastic test.The experiment result shows the largest stress concentrated along Akesai,the midpart of the Keketuohai-Ertai fault.After release of stress in drill-hole,the concentrated area of largest stress migrates to the south segment of the earthquake fault and the east part of the region.The concentrated area of stress before and after earthquakes foundainentally fit the spacial distribution of moderate strong earthquakes in this region.