TRAV: A travel time and ray parameter tool
=============================================

For earthquake location, one interesting aspect is how to get the travel time and ray parameters in a 
efficient way with velocity structures given.

Here I prepared a modified ray tracing tutorial for 1-D layered velocity scenarios. 
The tutorial including two parts: A description file and a code file (Fortran). 
Download :download:`here </code/tl/trav/trav.zip>`