Abstract: The electromagnetism disturbance observation is a new method of seismic monitoring and forecasting. Earthquake administration of Hebei Province has started to study the electromagnetism disturbance observation since 1981. After more than 20 years′ observation and exploration of earthquake forecasting methods, the research results play an important role in the seismic monitoring and forecasting in the Capital Circle Region and Hebei Province. In this paper, we cleared up the electromagnetism disturbance observation data, colleted from 8 stations in Hebei area from Sept. 2005 to May 2006, basing on the demand of “the code of digital observation method of the earthquake precursor and the earth electricity” projected by the Earthquake Administration of China. We also studied the distinct anomaly and characteristics of the electromagnetism disturbance before 5 moderately strong earthquakes in Capital Circle Region and discussed the advantage, potential and some other problems in the electromagnetism disturbance observation.

Key words: Electromagnetism disturbance observation, Anomaly characteristics, Earthquake precursor relation, Earthquake forecasting