Imaginary seismogram is obtained by Hilbert transform and three instantaneous information is obtained by complex seismic trace analysis method in this paper.

• 复地震道分析又称三瞬分析,该分析方法可将反映地震信号局部变化情况的地震波的瞬时振幅、瞬时相位和瞬时频率等信息分离开。