【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。更多还原

【Abstract】 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.更多还原