震前电磁辐射异常频次研究

利用河北省电磁辐射台网１９８８年—１９９２年的观测资料，对其间在各台项出现的异常频次及其累加特征进行了分析研究，并计算了每年的异常频次１０ｄ累加速率值Ｋ，发现其中震前半个月至一个月出现连续高值异常，并在临震前形成突出峰值，指出这一结果在短临预报中的意义。

Study on Anomalous Frequence of Electromagnetic Radiation before Earthquakes

The anomalous frequence and its accumulated features of the stations between 1988 and 1992 were analyzed using the observation data of the electromagnetic radiation network in Hebei province,the 10 d accumulated rate K of anomalous frequence of every years were calculated.It was discovered that the successive high value anomaly occurred half a month to a mouth before the earthquakes,and the peak value occurred immediately before the earthquakes.