山西大同-阳高6.1级地震电磁异常的再研究

在山西大同—阳高 1989年 6 .1级地震的震例总结中 (张肇诚 .中国震例 .北京 :地震出版社 ,2 0 0 0 ) ,共收集了 8项电磁异常 ,经过对资料的进一步整理研究 ,又发现了 10项异常。以这些异常为样本 ,研究了电磁异常的演化特征及物理机制 ,探讨了数据处理与异常识别的方法、场源关系及区域应力场的特征。结果表明 ,地电异常在震前零散分布 ,以近场区域的中短期异常为主 ,并有从外围向震中迁移的现象 ;地磁异常相对集中 ,呈现分组、准同步上升变化现象 ,异常幅度较大 ;电磁波异常以短临变化为主

Further Study on Electromagnetic Anomaly before M6.1 Earthquake at Datong-Yanggao,Shanxi

The 8 terms of the electromagnetic anomalies before Datong-Yanggao earthquake with M6.1 of 1989 were summarized into the book of THE EXAMPLE OF EARTHQUAKE IN CHINA (Zhang Zhaocheng,Beijing,Earthquake Publishing House,2000),after the further study on the data,10 terms of the anomalies were discovered again.Taking the anomalies as samples,the evolution feature and physical mechanism of the electromagnetic anomalies,the method of the data processing and anomaly recognition,the relation between field and source and the feature of the regional stress field were discussed.The conclusion showed that the distribution of the geoelectric anomalies before the earthquakes is scattered,the medium-and short-term anomalies of the near field are dominative,and they appear from outlying zone to epicenter;the distribution of the geomegnetic anomalies is relatively concentrated,they rise quasi-synchronously in a group,the anomalies are larger,the short-impending anomalies of the electromagnetic wave are dominative.