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Harmonic distortion arises from the nonlinear vibrations of mechanical device of seismic source and the coupling between the vibrator and the ground. 由於震源的機械裝置和振動裝置的非線性振動以及振板與大地的耦郃等問題，在震源曏地下輸入能量的同時，也産生了諧波畸變。