Abstract: Moderate strong earthquakes are main activity in eastern China continent.In this paper,the statistical characteristics of the pattern,the spatial distribution and time varation of groundwater level anomalies before the earthquakes in this region,and their relations to area,time of earthquake occurrence and magnitude are systematically analysed on the basis of former studies.In addition,the reliability and the prediction efficiency is inspected by an example of Datung-Yanggao moderate-strong earthquake series,October,1989.

Key words: Eastern China continent, Moderate-strong earthquake, Groundwater level, Anomalous characteristics

摘要： 中国大陆东部地区的地震活动以中强震为主。本文在前人工作的基础上用统计学的方法系统分析了该区中强震前地下水位动态异常的形态,时间与空间分布特征及其与地震三要素的关系,由此建立了地震预报的指标,并用1989年10月大同-阳高6.1级地震的实例进行了其信度与预报效能的检验。

关键词: 中国大陆东部, 中强地震, 地下水位, 异常特征