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近年来的一些研究表明，由于地震前孕震区地下介质的电性结构的变化，将导至地磁短周期转换函数发生异常变化。本文通过对1991年唐山5．2、5．6级地震前后静海台地磁短周期转换函数参数的计算及其结果的分析和研究，提取出了可靠的地震短临前兆信息，确立了将其应用于唐山地区5级以上地震预报的短临异常特征及其指标。
Some researches in recent years show that due to the change of the electrical structure of the subterranean media in the seismogenic zone before the earthquake, the short-period conversion function of geomagnetism will lead to abnormal changes. In this paper, we calculated and analyzed the parameters of the Jinghai station geomagnetic short-period transfer function before and after the Tangshan 5.2 and 5.6 earthquake in 1991, and then extracted the reliable short-term precursory earthquake information and established its application Short - term Anomaly Characteristics and Indicators of Earthquake Prediction Above the 5th Class in Tangshan Area.