按照安艺敬一(Aki)提出的地震尾波理论,利用同一地震的多台记录,以同一地震有一确定的地震矩为基础建立方程,并以文献[8]所得出的品质因子数为基准,测定了四川部份地区地壳浅部的介质品质因子.结果表明,地震尾波的衰减存在着明显的方位依赖.根据1971年至1975年间几次地震所给出 Q 值来看,四川部份地区大致可以分为三个不同的 Q 值区,值得注意的是:低 Q 区内曾发生过7.1级强震. According to the earthquake wake-wave theory proposed by Aki, using multiple records of the same earthquake, equations are established based on a certain earthquake moment of the same earthquake. Based on the quality factor number obtained in [8] The medium quality factor of shallow crust in Sichuan was measured.The results show that there is a clear azimuth dependence of the attenuation of the earthquake wake.According to the Q values ​​of several earthquakes from 1971 to 1975, It can be roughly divided into three different Q values. It is noteworthy that there have been 7.1 earthquakes in the low Q zone.