中国东北地区浅源地震活跃期特征分析

摘要

从中国东北地区不同活跃期深源地震、浅源地震的能量释放、持续时间,活跃期关门地震时间韵律,第5活跃期中强地震有序分布图像等角度,对比分析了中国东北地区第5活跃期的基本特征.结果表明:中国东北地区浅源地震第5活跃期能量释放远低于其他几个活跃期,深震和浅震的能量释放比值大,持续时间长,关门地震重演了前4个活跃期的时间韵律,表现为时间、空间丛集以及震群性质,出现空区和条带状有序活动图像,2013年的7次5.0级以上可能是第5活跃期的结束地震.%From the perspectives of energy of deep and shallow earthquakes and their energy release ratio as well as duration,the rhythm repetition of the end earthquakes of the fifth activity period and orderly activity image of moderate strong earthquake in the fifth activity period in northeastern China,we analyzed and compared characteristics with that of the former four periods.The results show that the energy release of the fifth activity period is far lower than other activity periods,energy release ratio of deep earthquakes and shallow earthquake is large,and the sustained time is long.The “closing door” earthquakes sustained the rhythm repetition of the former 4 activity periods.The properties of the “closing door” earthquakes include time and spatial clustering as well as earthquake swarm,seismic gap and banded orderly distribution image.The 7 earthauakes of Ms≥5.0 in 2013 may be the “end” earthquakes of the fifth activity period.