1990年共和7.0级地震和景泰6.2级地震前的短临弱前兆信息

应用作研究的提取弱短临前兆信息的方法及定量指标^2]，对1990年甘肃、青海、宁夏、陕西四省（区）部分专业台4种手段、31个台（项）的观测资料进行了处理。结果表明，在1990年共和7．0级地震和景泰6．2级地震前，约占总数65％的台项均出现了弱前兆异常。事实进一步证明，作提出的提取弱短临前兆信息的方法是有效和实用的。

SHORT-IMPENDING WEAK PRECURSOR INFORMATIONS BEFORE THE GONGHE MS7.0 AND JINGTAI MS6.2 EARTHQUAKES IN 1990

The short-term and imminent earthquake prediction is the majordifficult problem on earthquake prediction.It is dependent on good precursory measures and data processing method.Based on the viewpoint of the weak precursor information and by using the method for getting the information,the data observed from 31 stations or observation items such as radon in groundwater,water level,earth resistivity and ground stress in Gansu，Qinghai，Ningxia，Shaanxi are processed. The results show that there are weak precursor informations on about sixty five percent of the stations or items before the Gonghe MS7.0 and Jingtai MS6.2 earthquakes.It is quite evident that the method has higher capacity for distinguishing anomalies than other ways.