For contemporary seismological observatory practice and seismic exploration work, the fast Fourier transform (FFT) has become such a common tool that we rarely think about single transforms. Often, we switch from time to frequency to time domain without even examining the spectral data. Restituting seismometer response, calculating source spectra, checking frequency‐dependent attenuation, and doing fk analysis are only a few applications in seismology, in which the FFT processing steps are an essential tool. Since the advent of modern digital computers, much effort has been made to make the Fourier transform efficient and fast.

The basics for the modern...

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