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Spatial Correlation Anomalies of the Diurnal Variation of the Geomagnetic Vertical Component before the Yingjiang MS6.1 and Ludian MS6.5 Earthquakes
Dai Yong,Feng Zhisheng,Yang Yanming,Gegen
作者单位E-mail
Dai Yong Earthquake Agency of Inner Mongolia Autonomous Region, Hohhot 010010, China  
Feng Zhisheng Jiangsu Earthquake Agency, Nanjing 210014, China fengzs2001@sohu.com 
Yang Yanming Earthquake Agency of Inner Mongolia Autonomous Region, Hohhot 010010, China  
Gegen Earthquake Agency of Inner Mongolia Autonomous Region, Hohhot 010010, China  
摘要:
Significant anomalies were observed at the geomagnetic stations in the southwest region of China before the Yingjiang MS6.1 earthquake and the Ludian MS6.5 earthquake in 2014. We processed the geomagnetic vertical component diurnal variation data by the spatial correlation method. The results show that during the period from April 1 to May 20, 2014,there existed quasi-synchronous decrease changes in the coefficient curves between the five geomagnetic stations of Guiyang,Hechi,Nanshan,Muli,Yongning and Xinyi and Hongshan stations.Furthermore,there was a high gradient zone in the normalized correlation coefficient contour map with background values removed. The epicenters of the Yingjiang MS6.1 earthquake and the Ludian MS6.5 earthquake are located in the gradient zone or near the gradient zone.
关键词:  Yingjiang MS6.1 earthquake  Ludian MS6.5 earthquake  Geomagnetism  Vertical component  Abnormal variation
DOI:
分类号:
基金项目:This project sponsored by the Spark Program for Earthquake Science and Technology, China Earthquake Administration (Serial No.XH17010Y), the Seismic Tracking and Orientation Task, China Earthquake Administration (Serial No.2018010401), Major Scientific and Technical Project of Science and Technology Department of Inner Mongolia in 2016 (Strong Earthquake Track in the Short Stage and Integration Innovation of Stereoscopic Observation Technology in Space and Ground).
Spatial Correlation Anomalies of the Diurnal Variation of the Geomagnetic Vertical Component before the Yingjiang MS6.1 and Ludian MS6.5 Earthquakes
Dai Yong,Feng Zhisheng,Yang Yanming,Gegen
Abstract:
Significant anomalies were observed at the geomagnetic stations in the southwest region of China before the Yingjiang MS6.1 earthquake and the Ludian MS6.5 earthquake in 2014. We processed the geomagnetic vertical component diurnal variation data by the spatial correlation method. The results show that during the period from April 1 to May 20, 2014,there existed quasi-synchronous decrease changes in the coefficient curves between the five geomagnetic stations of Guiyang,Hechi,Nanshan,Muli,Yongning and Xinyi and Hongshan stations.Furthermore,there was a high gradient zone in the normalized correlation coefficient contour map with background values removed. The epicenters of the Yingjiang MS6.1 earthquake and the Ludian MS6.5 earthquake are located in the gradient zone or near the gradient zone.
Key words:  Yingjiang MS6.1 earthquake  Ludian MS6.5 earthquake  Geomagnetism  Vertical component  Abnormal variation