四种方法对四川九寨沟7级地震的初步回顾预测
Reviewing Prediction for Jiuzhaigou, Sichuan MS7.0 Earthquake Using Four Methods

对2017年8月8日四川九寨沟发生的7级地震，基于四种非传统预测地震的方法进行回顾分析。这四种方法分别为：准静中动地震法，三性法预测，异年倍九法，震兆共迁法。在进行回顾性预测之后，发现其结果都有一定程度的符合性。
In this study, we review the Jiuzhaigou MS7.0 earthquake occurred on August 8, 2017, in Sichuan Province, by using four methods——the "quasi-activity in quiescence" method, the triplet method, the rhythm of multiplied nine days in different years, and the method of earthquake precursor co-migration. The results show that the prediction of the four methods are all in agreement with the practice to a certain extent.