2014年云南盈江6.1和鲁甸6.5级地震前地磁垂直分量日变化空间相关异常特征

Abstract

Abstract: There are significant anomalies at the geomagnetic stations in southwest region of China before the 2014 Yingjiang M6.1 earthquake and the Ludian M6.5 one. We processed the geomagnetic vertical component diurnal variation data by the spatial correlation method. The results show that, during the period from 1st April to 20th May, there existed quasi-synchronous decrease changes in coefficient curves between the five geomagnetic stations including Guiyang, Hechi, Nanshan, Muli, Yongning and the 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 M6.1 earthquake and the M6.5 Ludian earthquake were respectively located in the gradient zone or near the gradient zone.

Key words: Geomagnetic vertical component, Spatial correlation, Precursory anomaly, Yingjiang M6.1 earthquake, Ludian M6.5 earthquake

CLC Number:

P315.7

DAI Yong,FENG Zhi-sheng,YANG Yan-ming,LIANG Ying,GE Gen. Spatial Correlation Anomalies of Geomagnetic Vertical Component Diurnal Variation before Yingjiang M6.1 and Ludian M6.5 Earthquakes[J]. EARTHQUAKE, 2017, 37(3): 138-147.

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Spatial Correlation Anomalies of Geomagnetic Vertical Component Diurnal Variation before Yingjiang M6.1 and Ludian M6.5 Earthquakes

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