Amplitude Spectrum
Amplitude Spectrum : The amplitude spectra of digitized series is obtained by using discrete Fourier transform, and spectral-time obtained by the so-called multiply filter technique. For example, in studying seismic recordings, It has been shown that there are distinct differences in the form of amplitude spectra of Rayleigh waves for two groups of earthquakes. The main maximum of spectra for the tsunamigenic earthquakes is much wider than for those nontsunamigenic and position is shifted to the low-frequency domain. Studying the spectral-time diagrams also shows that there are differences in their structure between both groups of earthquakes, which can be used to recognize tsunamigenic earthquakes
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