一次强烈破坏性地震发生之前,往往震中及邻近地方小震活动呈现某种异常变化,小震震级序列自相关函数的计算正是企图从小震序列的随机变化中提取预测信息的。1979、3、15日普洱6.8级地震前后,小震自相关函数有显著变化给人以深刻的印象,值得在今后中短期预报中予以尝试。 Before a strong and devastating earthquake occurred, the earthquakes in the epicenter and nearby places showed some unusual changes. The autocorrelation function of small earthquake magnitude sequence was trying to extract the forecast information from the random change of small earthquake sequence. The significant changes of the autocorrelation function of the small earthquakes before and after the Pu’er M8.8 earthquake on 1979, the 3rd and the 15th were impressive and worth meriting in the medium and short-term forecasts in the future.