【摘要】 首都圈及其附近地区多年观测的电磁辐射资料表明，地震电磁辐射异常与 ３００ ｋｍ范围内５级以上地震，２００ ｋｍ范围内 ４．５～４．９级地震和１００ ｋｍ范围内 ４．０～４．４级地震具有比较明显的对应关系。其变化规律和映震特点是震中距愈小，地震愈大，信息持续时间愈长，异常幅度也愈大；异常面积（即异常台站数）与地震大小成正相关。统计表明，中等以上地震与异常信息对应率约７６％。更多还原

【Abstract】 The electromagnetic radiation data observed for many years in the Capital cir- cle and its surrounding area demonstrates that electromagnetic radiation anomalies are rel- ative significantly with the earthquakes M ≥ 5 within a rang of 300 km, the earthquake M = 4. 5 ～4. 9 within 200 km and the earthquakes M = 4. 0～4. 4 within 100 km. The seismic precursor feature is that the larger the earthquakes, the shorter the epicentral dis- tance; the longer the duration, and the greater the amplitude of the anomalies, as well as the anomalous area, i. e. the number of the stations with anomalies, is positive propor- tional to the earthquake magnitudes. The statistical result shows that the correspondence ratio of moderately strong earthquakes or stronger events reaches 76%.更多还原