[GRASSLIST:3463] Geophysical/Potential field modules for GRASS?

[Funkmeister]

Hello, I will need to process/interpret some geophysical data (gravity, 
mag) and I would like to use GRASS for this purpose. Is anyone aware of 
any modules available for GRASS? I need to do things like trend 
removal, terrian corrections, Bouguer correction, reduction to pole, 
downward continuation, etc. I will also need to apply any number of 2-D 
filters.

If there are no suitable modules, I will likely write them. So please 
also let me know if anyone else is interested in such modules, and 
features that would be desired.

Thank you,
Craig