I was useing Obspy spectrogram to look some Deep-ocean Assessment and Reporting of Tsunamis (DART) data.
The raw data is seafloor pressure[dbar].(The variation of pressure with Time)
The spectrogram x scale is time series, y scale is frequency.
I would like to get the data (The variation of amplitude of frequency with Time) which converted by spectrogram(FFT).
And I expect to plot like this picture.
What should I do? Is there have any way to get the converted data?
Could I output the data (The variation of amplitude of frequency with Time)?