In this paper, the semi annual variation of the lithospheric magnetic field in Hebei and its surrounding areas was obtained by using the data of mobile geomagnetic vector from 156 observation points of North China in autumn 2019, and the overall variation characteristics of lithospheric magnetic field in the study area were analyzed and summarized. Furthermore, the local variation and anomaly characteristics of lithospheric magnetic field before the Huai'an, Hebei MS3.4 earthquake on December 3, 2019 and the Fengnan, Hebei MS4.5 earthquake on December 5, 2019 were studied. The results showed that the epicenter of Fengnan MS4.5 earthquake was located in the turning area of vector H, the high value area of negative anomaly of total intensity F, the high gradient zone of negative anomaly of element D and the high value area of Z value. The Huai'an MS3.4 earthquake occurred in the area where the amplitude of vector H weakened and turned, the positive area near the zero value line of element D and the low value area where the Z value changed.
赵慧琴,张海洋,李博,王朝景,刘德强,毛丰龙.河北及周边地区岩石圈磁场变化及震前异常特征[J].地震工程学报,2021,43(5):1008-1013. ZHAO Huiqin, ZHANG Haiyang, LI Bo, WANG Zhaojing, LIU Deqiang, MAO Fenglong. Variation and pre-seismic anomaly characteristics of the lithosphericmagnetic field in Hebei Province and its surrounding areas[J]. China Earthquake Engineering Journal,2021,43(5):1008-1013.复制