【摘要】 简要回顾了中国学者对地震大形势的主要研究结果 .指出地震活动时空强分布的不均匀性是地震活跃期和平静期的外在表现 .系统地分析了青藏高原北部地区的地震活动形势 ,指出 2 0世纪以来 ,该区MS ≥ 6 .0地震经历了 6个活跃期和 6个平静期 ,与中国大陆地区的地震活动不同步 .2 0 0 0年 6月甘肃景泰 5.9级地震和同年 9月青海兴海 6 .6级地震的发生意味着该区进入了一个新的地震活跃期更多还原

【Abstract】 The main conclusions of the study on the seismicity tendency by other men of learning are reviewed briefly, and the main behaviors of the seismicity in time and space are obtained.Meanwhile, the tendency of seismicity in northern Qinghai Tibet plateau is analyzed systematically. There are 6 active periods and 6 quiet periods of seismicity in the region in the 20th centenary, not synchronizing with that of the continent of China. A new active period for earthquake begins by the Jingtai M S5.9 earthquake on June 6, 2000 and the Xinghai M S6.6 earthquake on Sept.12,2000.更多还原