安庆M4.8级地震前地磁低点位移现象研究

英文篇名：The Phenomenon of Geomagnetic Low-point Displacement before Anqing M4.8 Earthquake
中文刊名：华南地震
英文刊名：South China Journal of Seismology
作者：李军辉 ; 何康 ; 陈俊 ; 洪德全 ; 陶月潮 ; 郑海刚
英文作者：LI Junhui1 ; HE Kang1 ; CHEN Jun2 ; HONG Dequan1 ; TAO Yuechao1 ; ZHENG Haigang1(1.Earthquake Administration of Anhui Province ; Hefei 230031 ; China ; 2.Mengcheng Seismic Station in Anhui Province ; Bozhou 233527 ; China)
中文关键词：安庆地震 ; 地磁Z分量 ; 低点位移 ; 地磁日变
英文关键词：Anqing M4.8 earthquake ; Geomagnetic Z component ; The 1ow point displacement ; Daily variation of geomagnetic
出版日期：2013-06-15
机构：安徽省地震局;蒙城地震台;
年：2013
期：02
出版单位：华南地震

摘要

对安庆MS4.8地震前中国大陆东部地区42个台站的地磁Z分量的幅度和相位进行分析,结果显示安庆地震前,华东地区出现地磁Z分量日变化幅度的极小值时间在空间上出现地磁低点位移现象,低点时间分界线沿郯庐断裂带呈现NNE走向,分界线两侧低点时间相差超过2 h,地磁日变也出现明显的畸变,发震日期为异常发生后的29(27±4)d,震中位于低点位移分界线附近,地磁低点位移的出现可能与安庆地震的孕育和发生相关。
Based on the analysis of phase and amplitude geomagnetic Z comporent of 42 stations before Anqing M4.8 earthquake in East China,We find that the spatial distribution of the appearance time of the minima(the low-point time of the geomagnetic vertical component) appears anomalous features before the M4.8 earthquake;the strike of dividing line along the Tanlu fault appears NNE;The difference of laotim between the both sides of the dividing line are more than 2 hours.It has been found that most earthquakes occur in the vicinity of the boundary line of sudden change of the low-point displacement and generally within 29th day counting from the day of appearance of the anomaly.The anomalies of diurnal variation may have some connection with Anqing earthquake.

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