东亚大陆大三角地震区的强震成组活动迁移图像分析

Analysis on the Migration Patterns of Grouping Earthquakes in the Great Seismic Triangle Area of Eastern Asia Continent

本文分析了1900—2008年东亚大陆大三角地震区7.5级以上大地震的地震活动时空图像,认为:①1902—1974年东亚大陆大三角地震区的7.5级以上浅源地震成组活动的主体地区,沿着大三角地震区的边界顺时针迁移,到了1997—2001年开始转移到大三角地震区的内部;②对于整个大三角地震区而言,近代7.5级以上浅源地震的震级(M)-时间(t)过程表明,地震活动是活跃和平静交替出现的幕式过程;③大三角地震区近代7.5级以上浅源地震的时空迁移图像的力学机制,可能是地震区内地震断层应力转移和耦合的相互作用。

This paper analyses the time-space seismicity pattern（MS≥7.5） in the great seismic triangle area of eastern Asia continent from 1902 to 2008.The results show that： ① during a period from 1902 to 1974,the main areas of earthquake grouping migration was along the boundary of the great seismic triangle area in a clock-wise direction,and after that time,earthquake activity entered inside the great seismic triangle area;② for the whole seismic triangle area,earthquake process with time indicates an episodic characteristics of alternative activity and quiescence;③ the migration pattern of grouping seismic activity in the seismic triangle area might be related to a mechanic mechanism,with mutual effects among seismic faults,stress transfer and coupling.