The Analysis of Seismic Signal Spectrum Based on ZFFT

In order to get a certain fine structure of the seismic signal spectrum and improve the frequency resolution, this paper puts forward the frequency refining technology. Based on the complex modulation shift, digital low-pass filter, resample, complex FFT processing and frequency adjustment, this paper successfully achieves the ZFFT of the seismic signal, which uses the MATLAB to analyze the actual seismic signal, getting the frequency of maximum energy of the seismic signal. It realizes accurately and rapidly to analyze and study a certain narrowband spectrum of the seismic signal. Compared to FFT, ZFFT is a more effective way to analyze local frequency structure of the seismic signal in the terms of analysis accuracy.