Setting up a personal velocity model database
Decide on a directory to place your personal database into. For the
purpose of illustration assume this is $HOME/mymodels.
Copy the default database tables from $ANTELOPE/data/tables/genloc/db to
your personal database directory.
Edit the mod1d table as described in adding
a new velocity model document.
If desired you can delete one of the existing models in the default database,
but this is normally not a very good idea as it can cause great confusion
in communication with others.