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应用ＴＩＰ中期地震预报方法中的ＣＮ算法，对河南省及其邻区发生的中等地震进行了回溯性检验。结果表明内符效果较好，被检验的中等地震中有８０％震前出现了ＴＩＰ，ＴＩＰ警戒时段占总研究时间的２３．３％，综合计算报准率Ｒ值为０．５９。说明该算法对中等地震的中期预报具有实用意义。
Using the CN algorithm in the mid-term TIP prediction method, a retrospective test was conducted on the moderate earthquakes that occurred in Henan and its adjacent areas. The results show that the internal effect is better. TIP occurred in 80% of the moderate earthquakes tested before the earthquake, and the TIP warning time period accounted for 23.3% of the total research time. The comprehensively calculated RRR was 0.59. It shows that the algorithm is of practical significance for mid-term prediction of moderate earthquakes.