The Phenomenon of Geomagnetic Low-Point Displacement before Anqing M4.8 Earthquake
详细信息
- 责任者：Li Junhui (Earthquake Administration of Anhui Province ; Hefei 230031 ; China) ; He Kang
- 刊名：South China Journal of Seismology
- 出版年：2013
- 卷期：33(2)
- 关键词：地磁场 ; geomagnetic field ; 地震前兆 ; precursor ; 安徽 ; Anhui Province
- 页码：p.41-46
- 图表：illus., 14 refs.
- 分类号：0500
- issnNo：ISSN1001-8662
- isbnNo：CN44-1266/P
摘要
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.