Abstract: HHT (The Hilbert-Huang transform) is a signal analysis method developed in recent years，which has clear physical meaning, high-degree accuracy and adaptability. In this paper, the principle of HHT is introduced, and HHT spectra of both model signals and seismic cycles are analyzed. The result suggests that this method can perfectly distinguish the model signals, and different type seismic cycles are correspondent to their HHT time-frequency spectra. This provides theoretical evidences for seismic sequences identification and sedimentary faces analysis.

Key words: Hilbert-Huang transform (HHT), empirical mode decomposition (EMD), intrinsic mode function (IMF), spectrum analysis, seismic cycles