gpell for fundamental and first order

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luigiV
Posts: 89
Joined: Fri Jul 17, 2020 9:28 am

gpell for fundamental and first order

Post by luigiV »

Hi Marc,
Is it possible to calculate with gpell also the ellipticity of the first mode as well as that of the fundamental?
Also what is the right syntax to export, using Geopsyland, the numerical output files (txt) as an alternative to the graphical representation only?
Thanks
Luigi

p.s. Will there be a Geopsy upgrade soon? The problem of the phase shift not working needs fixing ...

admin
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Re: gpell for fundamental and first order

Post by admin »

Hi Luigi,

Code: Select all

gpell -R 2 
calculates the first two Rayleigh modes (fundamental and first higher mode). If you add

Code: Select all

gpell -R 2 -one-mode
only the first higher mode is computed.

Look into the other options (angular, absolute, plot mode) with

Code: Select all

gpell -h all
To export the results to a text file:

Code: Select all

gpell -R 2 > mycurve.disp
Currently I'm working hard on a new 3C FK processing to be available in 3.5 and that has to be published before distributing the code. Probably at the beginning of next year, I will go back to 3.4 and fix bugs.

Best regards,

Marc

luigiV
Posts: 89
Joined: Fri Jul 17, 2020 9:28 am

Re: gpell for fundamental and first order

Post by luigiV »

Hi Marc,
thanks.
the only problem is the file.disp creation:
bin $ gpell 3116.txt> 3116.disp
Reading file '3116.txt' ...
C: / Program Files (x86) /geopsy3.4.2/bin/3116.disp: Cannot write to file.

I think that the commands ">" and "<" are not valid for the Geopsyland shell because I also tried with
bin $ gpdc <3116.txt
Cannot open file '<' for reading.

How can I resolve ?
Thanks

Another question related to gpsh:
using -qp and -qs I read that by assigning the default value = 0 the calculation takes into consideration the Qp and Qs values of the individual layers of the model. If I attribute to qp and qs a value other than 0 what is its meaning?
In the file sh1.page that I am attaching to you the transfer function in red is the one with qp and qs equal to 0. The curve in black refers to values of qp and qs equal to 5.
I can see that the amplitude decreases considerably as the frequency increases, but I don't know exactly why, not having understood how the non-zero values affect the calculation of the transfer function.
Thanks and best regards
Attachments
sh1.page
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Last edited by luigiV on Tue Dec 07, 2021 10:18 am, edited 2 times in total.

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