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通过数字与模拟观测对比分析,说明数模观测的一致性,结合近几年河北省及邻区中强地震,进行震例分析和研究。应用结果表明:数字与模拟观测变化一致性较好;震前数字电磁扰动出现异常变化,异常形态为:原始采集波形出现扰动变化、日均值或日总量出现高值突跳、日总量背景值上升等。
Through the comparative analysis of digital and analog observation, the coincidence of digital-analog observation is illustrated. Combined with the moderate-strong earthquakes in Hebei Province and its neighboring areas in recent years, earthquake cases analysis and research are carried out. The results show that there is a good consistency between digital and analog observation. Before the earthquake, the digital electromagnetic perturbation changes abnormally. The abnormal morphology is as follows: the disturbance of the original acquisition waveform changes, the daily average or daily total appears high jump, the total daily background Value increases and so on.