豫南及邻区地磁总场F日值相关性异常

对豫南及邻区6个地磁台站的地磁总场F日值数据做相关分析,研究信阳、卢氏、金寨、钟祥、十堰、应城这6个地磁台站数据的相关性异常,结合研究区发生的2次显著地震事件,即2018年2月9日河南淅川M_(L)4.3地震、2018年7月10河南固始M_(L)4.0地震进行综合分析,结果表明:①在地震发生前,地磁台站存在空间相关系数的低值异常,且低值异常平均持续23天;②异常幅度在一定程度上随着震中距的增大而减小;③在异常持续过程中,异常最低值时间基本统一,异常平均持续55天,从异常结束至发震平均间隔约34天。该异常具有短期物理效应。

Correlation anomalies of total daily F value of the geomagnetic field in southern Henan and adjacent areas

In this paper, a correlation analysis of the F value of the total geomagnetic field at 10 geomagnetic stations in southern Henan and adjacent areas was conducted and the geomagnetic correlation anomalies at six geomagnetic stations in Xinyang, Lushi, Jinzhai, Zhongxiang, Shiyan, and Yingcheng were extracted. Based on two significant earthquakes in the study area, i.e., the M_L 4.3 earthquake in Xichuan, Henan Province on February 9, 2018, and the M_L 4.0 earthquake in Gushi, Henan Province on July 10, 2018, it is believed that this anomaly may be an earthquake precursor. It is generally believed that there will be a possibility of an M_L 4.5 earthquake in the next few months in the area where the anomaly is located, that is, southern Henan and adjacent areas.