云南地区强震前中小地震活跃—平静的定量计算

Quantitative Calculation of Activation-Quiet of Medium and Small Earthquakes before Strong Earthquakes in Yunnan

以累计频度定量计算方法 ,讨论了云南地区 1970年以来 ,各个强震孕震区的地震活动非线性度ZL值的时间进程曲线 ,系统计算了Ms≥ 6 3级强震前的ZL值曲线 ,结果表明 :强震前地震活动非线性度ZL值异常表现出的地震孕震区的地震平静—活跃或活跃—平静过程至少出现一次 ,且震例中的 83 %开始出现平静(活跃 )的时间为强震前 1～ 2 12 年 ,强震前半年左右结束出现活跃 (平静 )。

Using the quantitative calculation method of accumulative frequency,the time progress curves of seismicity nonlinear ZL values in various seismogenic regions of strong earthquakes are discussed and the curves of ZL values are calculated.The results show that at least a seismic process of quiet-activation or activation-quiet in the seismogenic regions for anomalous seismicity nonlinear ZL values has occurred before the strong earthquake,and the processes of 83 per cent of earthquake examples began one to two years and half before strong earthquakes and ended about half year before strong earthquakes.