建立地下水位地震短临预报前兆标志体系的主要依据是:从以往的震例中总结、统计出的多种异常特征参量(即异常标志)与地震三要素之间的定量(或半定量、定性)关系.判定震级的异常标志有:异常分布范围、异常时空转移、异常数量、异常形态、异常持续时间和异常幅度;判定发震时间的异常标志有:异常开始和转折(结束)时间、异常数量、异常形态、异常时空转移和异常速率(或幅度);判定发震地点的异常标志有:异常空间分布图象、异常数量与密度、异常形态、异常时空转移、井孔对应地震的地区或控制范围、异常速率(或幅度)以及前次地震后效异常分布区等. The main basis for establishing the short-and-short-term earthquake precursory forecasting system for groundwater level is to summarize and quantify (or semi-quantitatively, qualitatively) the relationship between various anomalous characteristic parameters (ie anomaly markers) The relationship between the magnitude of the anomaly and the magnitude of the anomaly is: anomaly distribution range, anomalous space-time shift, the number of anomalies, anomalies, the duration of anomalies and the amplitude of anomalies; The number of anomaly patterns, the anomaly patterns, the anomalous spatiotemporal shifts and anomalous rates (or amplitudes) of the seismogenic anomalies; and the anomaly signs of the seismogenic sites are: anomalous spatial distribution images, anomalous quantities and densities, anomalies, anomalous space-time shifts, Control range, anomalous rate (or amplitude), and the anomalous distribution area of ​​the previous earthquake aftereffect.