我国东北地区新生代构造应力场的时空变化与地震活动

THE STRESS FIELD CHANGE IN TIME AND SPACE IN NORTHEAST CHINA AND SEISMOLOGICAL ACTIVITY

本文对东北区油田井斜,压裂、钻探资料及该区震源机制资料进行了综合分析,讨论了该区应力场的时空变化.发现东北大陆内毗邻的南北两区在地震活动性上存在明显的差别,其应力场特点也明显不同.无论是绝对应力值的大小,滑动系数的高低,还是最大水平主应力方向都有明显差异,其应力场随时间的变化趋势也不尽相同.地震活动性与应力场的时空变化特点之间似乎存在一定的对应关系.弄清这个关系,对于从应力测量角度预报地震是有好处的.

The paper analyzed the datas of borehole inclination. Hydraufracturing and drilling of the oil field in northeast china. then discussed the changes of stress field in the time and space. We discovered that there exists obvious difference in the seismological activity in southern and northern regious of Northeast China, and its characteristic of the stress field show also obvious difference. In addition absolute stress value, the slip coefficient and the orientation of the maximum horizontal principal stress have obvious difference, and stress field changes with the time are differnt fram each other, the characteristics of the there seemingly exists obvious corresponding relation, between seismicity and stress changes in time and space knowing this relation is beneficial for predicting earthquake from measuring stress.