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利用黑龙江及邻近地区地磁场总强度日变化极小值时间资料,分析了2008~2011年黑龙江及邻区4次中强地震前地磁“低点时间”在空间上的分布异常特征,发现地磁“低点位移”现象的某些特征类型与该地区中强地震活动存在一定相关性。通过对震前各种分布特征类型的分析,讨论了地磁“低点位移”产生机制,认为地磁“低点位移”对黑龙江及邻区地震活动的短临预测有一定参考价值。
Based on the minimum diurnal variation of total geomagnetic field intensity in Heilongjiang and its adjacent areas, the spatial distribution anomaly of geomagnetic “low time” before the four moderate-strong earthquakes in Heilongjiang and its neighboring areas from 2008 to 2011 was analyzed. Some features of geomagnetic “low displacement ” phenomenon are related to moderately strong earthquakes in the area. Through the analysis of various types of distribution before the earthquake, the mechanism of geomagnetism “low displacement ” is discussed. It is concluded that geomagnetism “low displacement ” has certain reference value for the short - term prediction of seismic activity in Heilongjiang and its neighboring areas.