20世纪中国地震地磁观测与研究回顾*

(1.云南省地震局,云南 昆明 650224; 2.中国地震局地球物理研究所,北京 100081)

地磁测量; 地磁总强度; 震磁前兆; 构造磁学; 岩石圈磁异常变化; 地震预测

Review on Seismomagnetic Observation and Research in China in the 20th Century
ZHAO Yufei1,YUAN Jiehao2,ZHAN Zhijia2,CHEN Bin2,GAO Jintian2

(1.Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)(2.Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)

geomagnetic survey; geomagnetic total intensity; seismomagnetic precursor; tectonomagnetism; lithospheric magnetic anomalous change; earthquake prediction

备注

通过分析国内外现有磁震资料发现,对于M5.0~7.8地震,在距离震中3~246 km的测点与台站上,观测到了地磁总强度与垂直分量的震磁信息,其幅度为8~20 nT,而前兆时间为20 d~2 a,这种震磁前兆信息是探索地震预测的重要依据。描述并讨论了20世纪初以来中国地震地磁观测与研究,具体分析了唐山M7.8、海城M7.3等地震的磁震信息,说明震磁前兆信息对探索地震预测的重要意义。最后结合工程爆破、地下核试验、密云水库实验、紫荆关等活动断裂的地磁观测试验,模拟地震孕育发生过程当中每个阶段的地磁表现特征。

By analyzing the existing seismomagnetic data around the world,we achieve the results that for M5.0 ~ M7.8 earthquakes,at the measuring point and station of 3 ~ 246 km from the epicenter,the seismomagnetic information of geomagnetic total intensity and vertical component was observed,and the intensity of the seismomagnetic information reached 8~20 nT,and the precursory time is between 20 days and two years.This article describes and discusses the 20th century China earthquake geomagnetic observation and research,and analyzes the Tangshan M7.8,Haicheng M7.3 magnetic anomalies,illustrating the significance of seismic precursor information to explore earthquake prediction.Also combined with the engineering blasting,underground nuclear test,Miyun reservoir,and Zijingguan fracture experiment of geomagnetic observation experiments,we simulate the process of earthquake nucleation magnetism performance characteristics of each stage.And these experimental researches on magnetic observations and earthquake are also very meaningful.