首都圈及其邻近地区电磁辐射映震效果研究
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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％。
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%.
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%.
引文
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[3]陈智勇,杜晓泉.地震电磁波前兆特征[J].地震地磁观测与研究.1989,10(5):40-43.
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