张家口—渤海地震带岩石圈磁场时空变化特征

doi:10.12196/j.issn.1000-3274.2022.01.010

Abstract

Abstract: Using the original geomagnetic vector measurements in North China during the periods from 2016 to 2018, the tempo-spatial variation models of the magnetic field in the lithosphere in North China and in the Zhangjiakou—Bohai seismicity belt have been obtained. The results show that there are obvious anomalies at the boundary between Zhangjiakou section and Beijing section, as well as between Beijing section and Tangshan section, the horizontal vector has the characteristics of direction turning and amplitude variation, magnetic declination angle and magnetic dip angle show the characteristics of positive and negative abnormally high gradient band. This is closely related to the tectonic segmentation of the Zhangjiakou—Bohai seismic belt. The Zhangjiakou—Bohai seismic belt is located between the Yanshan block and the North China plain block. The relative movement of Yanshan block and North China plain block is the direct reason of left-lateral strike-slip in the Zhangjiakou-Bohai seismic belt, and the difference of the left-lateral strike-slip rates between several fault belts maybe is the main reason why the spatial variation of lithospheric magnetic field is characterized by piecewise distribution.

Key words: Zhangjiakou—Bohai seismic belt, Mobile geomagnetic observation, Lithosphere magnetic field, Crustal stress direction

CLC Number:

P315.7

ZHANG Hai-yang, LI Bo, SU Shu-peng, WANG Zhao-jing, LIU De-qiang, ZHAO Hui-qin, MAO Feng-long. Tempo-spatial Variation Characteristics of Lithospheric Magnetic Field in Zhangjiakou-Bohai Seismic Belt[J]. EARTHQUAKE, 2022, 42(1): 133-144.

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Tempo-spatial Variation Characteristics of Lithospheric Magnetic Field in Zhangjiakou-Bohai Seismic Belt

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