地震地磁观测与研究2024，Vol.45Issue(2)：60-67,8.DOI:10.3969/j.issn.1003-3246.2024.02.008
2020年古冶MS 5.1地震前后岩石圈磁场变化特征
Analysis of the variation of the lithospheric magnetic field before and after the Guye MS 5.1 earthquake
摘要
Abstract
In this paper,the authors summarize the characteristic locations of precursory anomalies of moderate and strong earthquakes with M≥4 in Hebei and its adjacent areas since 2014;combined with the image of H-vector,d-factor,f-total field and 3-factor geomagnetic anomaly changes in the lithosphere magnetic field of the Guye MS 5.1 and Fengnan District MS 4.5 earthquakes,the characteristics of precursor anomalies of the lithospheric magnetic field of Guye earthquake and Fengnan District earthquake are obtained.The results show that:① The 7 M≥4 earthquakes in Hebei and its adjacent areas all occurred in the high-step belt near the"0-value line"of each geomagnetic element of the lithospheric magnetic field,"Near 0-value line",and the characteristic locations of the vector direction of the geomagnetic anomaly;② The Guye MS 5.1 earthquake accords with the characteristics of the spatial location of the precursory anomaly of the lithospheric magnetic field of the medium-strong earthquake in Hebei,with a probability of 75%;③After the Fengnan MS 4.5 earthquake,the anomaly characteristics of the Tangshan lithospheric magnetic field anomaly area were enhanced,and the risk area in situ had the possibility of another earthquake.关键词
岩石圈磁场/流动地磁/2019 年丰南MS 4.5地震/2020 年古冶MS 5.1地震Key words
lithospheric magnetic field/mobile geomagnetism/Fengnan MS 4.5 earthquake in 2019/Guye MS 5.1 earthquake in 2020引用本文复制引用
张娜,龚燕民,苏树朋..2020年古冶MS 5.1地震前后岩石圈磁场变化特征[J].地震地磁观测与研究,2024,45(2):60-67,8.基金项目
河北省地震科技星火计划攻关项目(项目编号:DZ2023120500001) （项目编号:DZ2023120500001）
