【摘要】 华北地区第三、四活动期强震应变释放存在起始—加速—平稳—高潮—调整的阶段性特征.结合两个活动期M≥6地震时序特征和应变释放的阶段性特点,将华北地区第三活动期划分为4个平静幕和5个活跃幕,将第四活动期迄今划分为4个平静幕和4个活跃幕.认为两个活动期相应活跃幕在时间进程上有较好的一致性,反映了一个地震活动期内的强震活动规律,可以对比并预测未来的强震活动.更多还原

【Abstract】 Strain release of strong earthquakes in the 3rd and 4th active periods in North China has phase characteristics as start-speed-smooth-climax-adjustment.Combining the timing characteristics and strain release phase feature of M≥6 earthquakes in the two active periods,the 3rd active period in North China is divided into 4 quiescence episodes and 5 active episodes,while the 4th into 4 quiescence episodes and 4 active episodes.The corresponding active episodes of the two active periods have good consistency in timing process,which reflects the law of strong earthquakes in a seismic active period,which allow us to compare and predict the future strong earthquakes.更多还原