So, research on the relation of the two types of anomalies for identifying the earthquake precursor especially the short impending precursor is very important.
因此，对两类异常关系的研究对于识别地震前兆特别是短临前兆至关重要。
2
Characteristic of space time magnitude in precursor field, mechanism of precursor anomaly, earthquake preparation, and relation between field and epicenter are analyzed.
分析了前兆场的时空强特征、前兆异常机理、孕震过程及场源关系。
3
By choosing The Times of cumulative AE events and based on the b-value variation in the relation between magnitude and frequency, the precursor information of rock burst was studied.