电离层异常能否作为地震前兆的研究  

RESEARCH ON POSSIBILITY OF IONOSPHERIC ANOMALIES AS AN EARTHQUAKE PRECURSOR

作　　者：杜品仁[1] 蒋和荣[2] 郭兼善[2] 

机构地区：[1]国家地震局地质研究所,中国北京100029 [2]中国科学院空间科学与应用研究中心,中国北京100080

出　　处：《地震》1998年第2期119-126,共8页Earthquake

基　　金：地震科学联合基金资助课题 (91 0 3 7) .

摘　　要：分析日本 4次地震前 5个电离层垂测站资料 ,发现地震前后震中附近夜间电离层偶发 E层的临界频率 f0 ES值多数呈下降趋势 ,少数呈增加趋势。分析国际地球物理年 ( IGY)期间多个地震震中附近电离层垂测站资料 ,得出 f0 F2 参数变异的统计特性是震前有正扰趋势。本文对震源电场影响电离层的机制进行了探讨。研究表明 。The data of 5 ionospheric vertical sounding stations before 4 earthquakes in Japan are analyzed. It is found that most of the critical frequencies of the E sporadic layer tended to decrease and the only few tended to increase around the epicenters before and after the earthquakes. The analytical results of ionospheric stations near 55 earthquake epicenters during International Geophysical Year (IGY) show that the statistical feature of foF2 disturbances is positive tendency before earthquakes. This paper discussed the mechanism of influence of source electric field on ionosphere. This research indicates that there is possibility of ionospheric anomalies before earthquakes as a precursor.

关 键 词：地震前兆 电离层异常 临界频率 地震预报 

分 类 号：P315.7[天文地球—地震学]