即使假设并不严格成立，也常把地震波和电磁波看作是平面波。
Seismic and electromagnetic waves are treated as plane waves even though that assumption is not strictly correct.
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 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.
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