摘要
2021年2月26日辽宁及周边地区多个台站地磁Z分量日变化幅度显著减小,通过调查异常日空间环境和周边人为活动等干扰,利用逐日比量化磁场幅度畸变量,并基于Kriging法模拟研究区逐日比空间分布,最后结合东北地区已有观测数据和历史地震的时空关系得出结论,认为此次异常为震前信息的可能性较高,异常区可能反映的是:异常日未来中短期内郯庐断裂带北端地区的地震活动有增强的趋势。
On February 26,2021,the daily variation amplitude of geomagnetic Z component at several stations in Northeast China showed a significant decrease anomaly.In this paper,we investigated the spatial environment of the abnormal day and the interference of human activities around,quantified the abnormal variable of magnetic field amplitude by daily ratio,and simulated the spatial distribution of daily ratio in the study area by Kriging method.Combined with the existing observation data and the temporal and spatial relationship of historical earthquakes in Northeast China,it is considered that the anomaly is more likely to be pre earthquake information,and the anomaly area may reflect that the seismic activity in the northern end of the Tan Lu fault zone will increase in the future.
作者
张志宏
顾娜
崔政东
ZHANG Zhi-hong;GU Na;CUI Zheng-dong(Liaoning Earthquake Agency,Liaoning Shenyang 110034,China;Tieling Seismic Station,Liaoning Tieling 112000,China)
出处
《防灾减灾学报》
2021年第3期23-29,共7页
Journal of Disaster Prevention And Reduction
关键词
地磁
逐日比
地震
geomagnetism
daily ratio
earthquake
