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

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%。

Relationship between Zero-value-line of Abnormal Geomagnetic Field in Lithosphere and Strong-moderate Earthquake Epicenters in North China Seismic Region

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%.