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华北地震区岩石圈磁异常场零值线与中强震震中分布关系
Relationship between Zero-value-line of Abnormal Geomagnetic Field in Lithosphere and Strong-moderate Earthquake Epicenters in North China Seismic Region
【摘要】 通过对华北地震区岩石圈磁异常场各分量的零值线分布以30km为缓冲半径建立缓冲区,并对缓冲区内1900年以来MS4.0及以上大陆地震进行统计,探讨华北地区岩石圈磁异常场零值线分布与中强震震中位置关系,发现7.0级以上地震震中分布与岩石圈磁异常场磁偏角、N向分量、E向分量以及垂直分量零值线的分布位置关系密切,其中震中分布与磁偏角的相关性最高,达83.3%。
【Abstract】 We build the buffer zones with a 30 km radius from the zero-value-lines of all components of the abnormal geomagnetic field in lithosphere of north China seismic region,and statistical analyze all the MS≥4.0 earthquakes in the buffer zones since 1900.The results indicate that there are close relativities among the epicenter distribution of large earthquakes with MS≥7.0 and the zero-value-lines of geomagnetic declination,north component,east component and vertical component of the abnormal geomagnetic field,and the epicenter distribution has the highest relation to the geomagnetic declination with proportion 83.3%.
【Key words】 Abnormal geomagnetic field in lithosphere; Zero-value-line; Buffer zone; Strong-moderate earthquake epicenter; North China seismic region;
- 【文献出处】 西北地震学报 ,Northwestern Seismological Journal , 编辑部邮箱 ,2012年02期
- 【分类号】P315
- 【被引频次】14
- 【下载频次】68