摘要
通过文献收集与整理,统计了主要由水压致裂法、应力解除法得到的北天山区域的应力数据。引入侧压力系数k、应力累积系数μm和断层摩擦系数μ,并根据Byerlee准则对计算数据进行分析,结果表明:研究区域应力积累程度较高,区域内整体较稳定,但局部断层滑动趋势风险较大。同时对研究区的地震分布进行统计,发现中西部和中东部区域小震频发,应力易得到释放;同时东北部和西北部小震频率低,推测为应力锁固段,应力积累程度高,若地震易发生强震;综合分析推测研究区断裂带更易沿NWW-SEE向滑动。
The North Tianshan area is one of the most active areas in the Tianshan Seismic Belt.The investigation of crustal stress state in the area can offer important reliable references to de-termine the activity and slip tendency of regional faults.The stress data in the North Tianshan ar-ea were collected with the hydraulic fracturing and stress relief methods.In this study,the lateral pressure coefficient k,stress accumulative coefficient fjLmJ and fault friction coefficient/x were in-troduced and utilized to analyze the collected stress data.According to Byerlee,s law,the analysis results indicate that the regional stress accumulation is high;the faults in the study area are sta-ble,while some local faults tend to slip.The statistics of earthquakes distribution in the study ar-ea indicate that small earthquakes are more likely to occur in the central-western and central-east-ern areas where the stress is easy to release,while there are few small earthquakes in the north-eastern and northwestern areas,where are inferred as locked patch of stress and likely to occur strong earthquakes because the stress accumulation is high.In addition,the statistics show that,the fault zone in the study area is more likely to slip along a NWW-SEE orientation.
作者
张杰
王成虎
贾晋
徐鑫
刘卓岩
ZHANG Jie;WANG Chenghu;JIA Jin;XU Xin;LIU Zhuoyan(Institute of Crustal Dynamics,China Earthquake Administration,Beijing 100085,China;Key Laboratory of Crustal Dynamics , China Earthquake Administration , Beijing 100085 , China;School of Engineering and Technology , China University of Geosciences (Beijing) , Beijing 100083 , China)
出处
《地震工程学报》
CSCD
北大核心
2018年第1期73-78,91,共7页
China Earthquake Engineering Journal
基金
国家自然科学基金资助项目(41574088)
