【摘要】 根据震前小震活动、ｂ值、η值、Ｎ值、“地震窗”的月频度、孕震地震条带、缺震曲线值，并利用地震学方法提取大震前兆信息的测震学参数：波速比值、振幅比值、尾波持续时间比值等地震活动性参数的变化，研究了武定６．５级地震前地震活动的特征。更多还原

【Abstract】 Based on the seismicity anomaly, such as small earthquake activity. b value.η value. N value.monthiy frequency of seismic window. seismogenic seismic belt. earthquake absent curve and combined with the seismometry parameter, such as Vb/Vs ratio.amplitude ration.continuous time ratio of coda wave ect. the characteristics of seismicity were studied before Wuding earthquake with 6.5 in Yunnan province.更多还原