【摘要】 利用苏家屯地震台的电磁辐射数字化分钟值资料研究了地震前电磁辐射前兆异常现象。发现地震前观测到的电磁辐射超低频电场与磁场出现明显的短期日变异常;超低频电场幅度从120mV 逐渐上升为700mV,超低频磁场则由100nT 逐渐上升为1100nT。在此异常期间,电磁辐射显示出每天一个准周期的近似方波形态,方波上升和下降时间的规律变化符合"晨昏电势"的概念;信息发展过程明显地周期变化,周期为13.5天,表明晨昏电场是地震孕育过程中的重要现象。发现了以往没有注意到的电离层"异常"现象,拓展了数字地磁观测资料异常提取的应用范围。更多还原

【Abstract】 By using the data of digital minutely value of electromagnetic radiation observed by Sujiatun geomagnetic station,the geomagnetic anomalies before earthquake were studied.It was found that there were obvious short period diurnal-variation anomalies in the electric field and magnetic field of electromagnetic radiation ultra-low frequency before earthquake.The amplitude of the ultra-low frequency electric field increased from 120mV to 700mV,and that of the ultra-low frequency magnetic field increased from 100nT to 1100nT.During the period,the electromagnetic wave showed the quasi-periodic square form every day.The anomalies of ascending and descending time accorded with the notion of daub-dusk electric potential obviously.The process of the anomaly information varied periodically with a circle of 13.5 days.The importance of the dawn-dusk electric potential caught by solar wind in process of earthquake was attested.The abnormal characteris- tics of ionosphere people seldOm pay attention to were shown,and the field of abstraction anomalies of digital geomagnetic data was enlarged.更多还原