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北天山地区2011 年以来两次6 级地震前的地震学中短期异常特征
王琼, 聂晓红, 吴传勇
新疆维吾尔自治区地震局,乌鲁木齐市新市区科学二街338 号830011
摘要:
通过分析北天山地区历史强震、构造活动背景、区域应变能积累特征以及2011 年11月1 日尼勒克、巩留交界6. 0 级和2012 年6 月30 日新源、和静交界6. 6 级地震前区域地震活动异常特征等,探讨了这两次6 级地震前的地震学中短期异常特征。结果表明,2011 年6 月以来北天山地区中强以上地震处于加速活动状态,进入应变能释放阶段;尼勒克、巩留交界6. 0 级和新源、和静交界6. 6 级地震震前先呈6 级地震平静而后被打破、中强地震成组活动和空间迁移、条带和空区等较明显的中期异常;震前还出现了较为相似的4 级以上地震围空和5 级逼近地震,且逼近地震与主震发生时间间隔均为14 天,显示了较清晰的异常图像和较明显的中短期震兆特征。
关键词:  2011年尼勒克、巩留交界6.0级地震  2012年新源、和静交界6.6级地震  北天山地区  中短期异常
DOI:
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基金项目:国家自然基金(41074042)和地震科技星火计划项目(XH13027)联合资助
Mid-and short-term anomaly characteristics on seismicity before the Two M6. 0 earthquakes in northern Tianshan Mountains since 2011
Wang Qiong, Nie Xiaohong, Wu Chuanyong
Earthquake Administration of Xinjiang Uygur Autonomous Region,Urumqi 830011,China
Abstract:
By analyzing historical strong earthquake activity,tectonic activity background, regional strain accumulation and anomaly character on regional seismicity before the Nilka-Gongliu MS6. 0 earthquake on November 1,2011 and the Xinyuan-Hejing MS6. 6 earthquake on June 30, 2012,the article researches the mid- and short-term anomaly character on seismicity before the two MS 6. 0 earthquakes. The result shows that moderately strong earthquake activity in the northern Tianshan mountains appeared accelerated since June,2011,and entered into the strain energy release stage. There are obvious mid-term anomalies such as MS6. 0 earthquake quiescence and broken,grouping activity and space migration of moderately strong earthquakes,seismic belt and gap etc. before the 2011 Nilka-Gongliu MS 6. 0 earthquake and the 2012 Xinyuan-Hejing MS6. 6 earthquake. There appeared M > 4. 0 earthquake gap and imminent earthquake with the magnitude 5. 0 before the two earthquakes,and the time intervals between the imminent earthquakes and the mainshocks were both 14 days or so,and which shows the clear abnormal images and mid- and short-term anomaly character.
Key words:  2011 Nilka-Gongliu MS6.0 earthquake  The 2012 Xinyuan-Hejing MS6.6 earthquake  The northern Tianshan region  Mid- and short-term anomaly