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

摘要/Abstract

摘要： 利用2016—2018年3期华北地区流动地磁矢量原始测量资料, 经数据计算获得2期华北地区和张家口—渤海地震活动带及邻区岩石圈磁场时空变化模型。研究结果显示: 张家口—渤海地震带岩石圈磁场变化空间分布不均匀, 具有明显的分区特征, 在张家口段(西段)与北京段(中西段)分界处和北京段(中西段)与唐山段(中东段)分界处岩石圈磁场各要素具有明显的异常变化, 如水平矢量存在转向和幅值变化, 磁偏角与磁倾角具有正负异常高梯度带的特征, 这与张家口—渤海地震带构造分段性特征密切相关。张家口—渤海地震带位于燕山块体与华北平原块体之间, 两者运动的平动速率之差是张家口—渤海地震带左旋走滑的直接动力来源, 而各断裂带左旋走滑速率之差很可能是岩石圈磁场空间变化分段性分布的主要原因。

关键词: 张家口—渤海地震带, 流动地磁, 岩石圈磁场, 地应力方向

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

中图分类号:

P315.7

张海洋, 李博, 苏树朋, 王朝景, 刘德强, 赵慧琴, 毛丰龙. 张家口—渤海地震带岩石圈磁场时空变化特征[J]. 地震, 2022, 42(1): 133-144.

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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