It indicated that the geomagnetic anomaly is a promising phenomenon in the studies of earthquake precursors.
说明地磁异常变化是一种有希望的地震前兆现象。
Before the Datong earthquake, water radon in many Wells showed trend positive anomalies, which is obviously different with the hydrochemical precursors of Zhangbei earthquake.
大同地震前多井出现水氡的趋势性正异常，是与张北地震水化前兆最显著的不同之处。
Based on the results of rock fracture experiments and the theory of seismic precursors, the preparation process of the earthquake is divided into several stages.
根据岩石破裂实验结果和地震前兆理论，对这次地震的孕育过程作了阶段性的划分。
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