VSP 

These are a set codes that can be used to process vsp data. Most
are standard tools developed and used for seismic data. Some, 
e.g. vspstk, were developed specifically for vsp data.
Users are referred to a USP note my Mike Mueller and Paul Gutowski
that details processing a zero offset vsp. The authors can be
contacted for a copy if one is not available to the user.
