【摘要】 公元1000年以来,中国华北地区强震存在4个活动期,本文以华北地区为研究区,分析了华北地区4个活动期的地震主体活动区,第3、第4活动期的时间韵律特征,第4活动期的期幕划分的基础上,对第4活动期的地震活动特征进行了分析。分析结果表明,华北地区第4活动期主体活动区位于河套地震带和河北平原地震带,华北地区第3和第4活动期分别具有54年周期、42年周期的时间韵律特征以及具有起始→加速→高潮→减速→结束的5阶段特征,第4活动期已经历了5个活跃幕,未来几年华北地区或将迎来第6活跃幕。更多还原

【Abstract】 There are 4 activity period of strong earthquake in north china from A.D. 1000,The North China as the study area, We have analyzed the seismic main active area of the fourth active period and the time rhythm characteristics of the third and the fouth activity period in North China, The stage curtain of the fourth active stage is divided into,Based on the result that we have analyzed the characteristics of seismic activity in the fourth active period. The analysis results show that the main activity areaof the fourth active period is located in the He Tao seismic belt and the Hebei plain seismic zone in North China.The third and the fourth period in North China has the time rhythm characteristics of 54 years cycle and 42 years cycles,as well as the 5 stages characteristics including start → acceleration → climax → reduce → end, The fourth active period has experienced 6 active curtains.更多还原