This paper reported the situations of developing electromagnetic wave observation before earthquakes in Xiamen city and the explorations on recognizing varieties of non-earthquake signals.
本文记述了厦门市地震局几年来开展电磁波观测的情况，以及对各种非震异常信号的识别探索。
The higher the frequency of the artificial earthquake wave, electromagnetic wave and sonic wave, the higher the resolution, but the attenuation is very fast and the exploration depth is very shallow.
人工地震波、电磁波和声波的频率越高，分辨率越高，但衰减快，可探测深度也降低。
The results observed show that electromagnetic wave anomaly can be regarded as a shortterm and imminent predicting index of earthquake.
观测结果表明，电磁波异常可以作为一种地震的短临预报指标。
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