[MSNoise] MSNoise-Tomo, Parameters

[Aurélien Mordret]

Hi Jannik,

The bmin and bmax parameters are the bandwidth min and max of the gaussian
filters used in the FTAN algorithm.

The FTAN applies a set a gaussian filters to the seismograms with different
central frequencies. The width of the filter (in Hz) for the minimum
central frequency is bmin and vice versa for bmax. The width for the
intermediate filters increases linearly between bmin and bmax.

These parameters are equivalent to the "alpha" parameters in this paper
defining the FTAN:

Herrmann, R. B. (1973). Some aspects of band-pass filtering of surface
waves. *Bulletin of the Seismological Society of America*, *63*(2), 663-671.


Hope it helps!

Aurelien

Le jeu. 26 nov. 2020 à 17:30, Jannik Kühn <jfkuehn at gfz-potsdam.de> a écrit :

> Hey everyone,
>
> I'm trying to use the MSNoise-Tomo plugin to compute dispersion curves
> that I can then use for a simple inversion, but I'm having a hard time
> to find "good" parameters. Could someone write me what the Bmin, Bmax
> parameters do and what they're called? Or refer me to a paper/article,
> where I can read a bit more about the subject.
>
> In the papers referenced I could find something regarding beamforming,
> is that maybe the B parameter?
> I appreciate gladly any help and references :)
>
> Best regards,
> Jannik
>
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Postdoctoral associate
Department of Earth, Atmospheric and Planetary Sciences
Massachusetts Institute of Technology
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e-mail: mordret at mit.edu
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