图13  小震条带的地震活动性参数的变化

       _{（a）条带内小震频度；（b）条带内小震的应变释放曲线；}

       _{（c）条带的b-t值曲线}

Fig.13  Curve of seismicity parameter variation of the 

        small earthquake band

        （a）small earthquake frequency in the band；

        （b）curve of small earthquakestrain release in the band

        （c）b-t_curve of the band