Beam power normalization in MASW

This forum is dedicated to discuss all problems and suggestions related to the use of geopsy database and its plugins (array processing, H/V,...).
admin
Site Admin
Posts: 412
Joined: Mon Aug 13, 2007 11:48 am
Location: ISTerre
Contact:

Beam power normalization in MASW

Postby admin » Thu Feb 12, 2015 2:37 pm

What do you mean as "beam power" in Geopsy --> Linear FK toolbox --> Output --> Beam power normalization ?

admin
Site Admin
Posts: 412
Joined: Mon Aug 13, 2007 11:48 am
Location: ISTerre
Contact:

Re: Beam power normalization in MASW

Postby admin » Thu Feb 12, 2015 2:37 pm

The dispersion curve plots for MASW are juxtapositions of F-K beam-forming patterns for the various frequency bands.
The maximum beam power value versus frequency is mainly controlled by the available energy at a given frequency and by the amount of energy that effectively travels at a defined velocity.
Without any normalization ("Raw beam power") the dispersion curve may not be clearly visible over the complete bandwidth due to frequency cuts (source, geophones and ground). With "spectrum power", the beam power is divided by the total amount of energy available at a given frequency. It is like flattening the spectum power. With the third option, even if the distribution of energy among observed velocity is not constant over frequency range, everything is normalized. The maxima where you can pick your dispersion curve have all the same values. Usually this is the most common option. However, if you want to check also the amount of energy available in your wavefield, it is wize to check at least once your results with the other options of visualization.


Return to “Geopsy usage”

Who is online

Users browsing this forum: No registered users and 2 guests