[CIG-SEISMO] New mesh construction for SPECFEM3D?

[Steve Smith]

Hello,

I would like to construct new meshes on sub-basin scale for SPECFEM3D.  
What meshing software was used to construct the meshes available in  
the GLOBAL and BASIN versions? Are there alternate or newly preferred  
meshing/modeling packages? I have access to Linux and OS X machines.

Sincerely,

-Steve Smith
geophysics Ph.D. student
Center for Wave Phenomena
Colorado School of Mines
stesmith  AT   mines.edu