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利用最大嫡谱和博氏分析方法分析了大同地震地下水群体异常的周期特征。结果表明．地下水群体异常存在着一系列的周期成分．其中4个月的周期成分显著，分波的振幅在大震前发生畸变。对这些现象的认识，将有助于识别异常的性质（有震，无震）．揭示异常与地震的复杂对应关系。对正确的震情分析判断和地震预报具有重要的实用意义。
The maximal echogram and Boerse analysis are used to analyze the periodic characteristics of groundwater anomalies in the Datong earthquake. The results show. There are a series of periodic components in the abnormal groundwater groups. The four-month periodicity is significant, and the amplitude of the sub-wave is distorted before the earthquake. Awareness of these phenomena will help identify the anomalous nature (earthquakes, earthquakes). Reveal the complex correspondence between anomalies and earthquakes. It is of great practical significance to analyze and judge the earthquakes accurately and correctly.