Abstract: The TTT (Tsunami Travel Times) programs calculates first-arrival travel times
on a grid for a tsunami generated at a given epicenter. TTT comes with
preprocessed bathymetry grids for the Atlantic, Indian, and Pacific oceans at a
variety of grid resolutions (5, 10, 15, 20, 30, and 60 arc minutes). The
calculations are based on Huygens method. The package contains two programs
(ttt and ttt_pick) which calculates travel times and samples the grid at given
locations, respectively. Several scripts (Bourne shell and DOS batch jobs)
illustrate how to make illustrations such as color images and contour maps from
the travel times by using the Generic Mapping Tools (GMT) software.

http://www.geoware-online.com/tttcdrom.html