I want to make a new 1D model in SPECFEM3D cartesian

SPECFEM
1

Dear All,

I want to generate data for my 1D velocity model in SPECFEM3D cartesian.
Would someone please guide me on how to set up the Par_file, and what are the steps to apply my 1D velocity model? Is there any available example for it?

Thanks,
Hamzeh