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page 19
When determining the VS vertical profile (therefore the Vs30), the first step is the
“determination of the velocity spectrum”. Then it is the turn of the direct modelling
(suggested procedure) or of the (automatic) inversion of the interpreted (picked, by the user
of course) dispersion curve.
To do this, first go to the section “determination of the velocity Spectrum” (see paragraph
4.1), from the main winMASW window (shown below)
In the Professional version it is possible to analyze the signal attenuation (of Rayleigh
waves) in order to get the Q quality factors. In order to achieve it, first of all the
reconstruction of the Vs vertical profile is necessary (see then paragraphs 4.1 and 4.2).
Once this is done you can step on to analyzing the attenuation, in the relevant section
(“attenuation analysis”).
Now you can calculate the attenuation curve (i.e. the curve that, for each frequency,
describes the amplitude drop of the signal according to the offset-that is the distance) of the
signal relevant to the Rayleigh waves in the case of obtained data through the standard
acquisition “vertical geophones and hammer”).
After that you need to upload the formerly obtained Vs model (.mod extension file). Now it is
possible to model or invert the observed attenuation curve, obtaining the Q quality factors.
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