【摘要】 通过多个震例研究认为,不同的井在几次强地震前记录了形态相同的水位下降过程,数量虽然不多,却表明地下水地震前兆异常的变化形态在短期到临震阶段具有重复出现的特征。这类异常出现转折后距地震发生时间一般较稳定,通常在20天左右或更短,是预报地震发生时间的重要指标。因此,研究此类异常的基本特征及其在分析预报中的应用就显得极为重要。更多还原

【Abstract】 Through the study of several earthquake cases,it can be held that the same decreases of groundwater levels in different wells,though not many,were recorded before several strong earthquakes.These decreases indicate that the groundwater anomaly before earthquakes has the character of recurrence especially in the period from short-term to imminent earthquake occurrence.The time of earthquake occurrence,usually about 20 days or shorter after these anomaly become break,is relatively steady,so it can be regarded as the important time index for prediction of earthquake occurrence.Therefore,it appears extremely important to study the basic characteristics and the usage of the anomaly in earthquake analysis and prediction.更多还原