关键词: 低点位移, 异常特征, 地磁交汇法, 华北地区

Abstract: The characteri stics of geomag netic low-value displacement anomaliessta tistically analyzed by using the geomagnetic Zcomponent data from Hebei and neig hbo ring prov inces′17 observ atio n statio ns. The study results show that: ① The anomalies do not have obviously dependent relations with calm or noisy day. ② Anomalies have seaso nal changes—i t cha nges most in winter and summer, the seco nd in autumn, and the less in spring. ③ The maximum time that anomalies deviate from noon is mostly in the af ternoon and in the west direction. ④ Anomalies correspo nding to earthquakes are 35% of the total anomalies, and the anomalies that an earthquake occurs in a month are 47% of them. The low-value displacement anomalies in daily chang es may appear many times, and we can get good prediction effect using the method of geomagnetic conv ergence presented in thispaper.

Key words: Low-value displacement, Characteri stics of anomalies, Geomag netic convergence Method, North China region