Velocity Model Setup for dbgenloc travel time calculators

  1. You should first set up a velocity model database for antelope.  (Click here  for a description of the velocity model database schema.)  A default version of this database will be installed in the 4.4 release of Antelope and above.  Earlier releases require installing a recent version of the contrib software.
  2. If you want to add a new layered velocity model you have two options:  (1) edit the  default velocity model database  model database or (2) create a  personal velocity model database.   If you want to add a new taup calculator model you will need to follow the procedures for doing this.  I (glp) haven't done this so you are on your own there.
  3. Now you need to attack the admittedly complex parameter files that genloc uses to define how it associates travel time calculators with each phase name.   The quick version is this.  (1)  It is best to copy one of the existing parameter files in $ANTELOPE/data/tables/genloc/xxxx, where xxxx denotes one of several directories containing different phase defintions, to some location that describes your new model definition.  (2)  edit the phase definitions to set travel_time_calculator = general, TTmodel = yourmodelname, and TTmethod set appropriate for the  chosen method.  For more details see the document on  genloc phase parameter file definitions.
  4. The final step is to edit your working dbloc2.pf file to allow dbloc2 and dbgenloc to see your new phase parameter file definition.   Suppose, for example, you just added a new phase definition you called "baja.pf" to the directory $ANTELOPE/data/tables/genloc/1dcvl.  Suppose you had this in your original dbloc2.pf file:
location_programs       &Tbl{
dbgenloc        1dcvl/kyrghyz taup/kyrghyz ttlvz/kyrgyz ttlvz/iasp91
dblocsat2       iasp91 # caucasus kyrghyz obn pakistan tanz_archean tanz_mobile
}

Then you would change this to (assuming you wanted baja to be the default choice):

location_programs       &Tbl{
dbgenloc        1dcvl/baja 1dcvl/kyrghyz taup/kyrghyz ttlvz/kyrgyz ttlvz/iasp91
dblocsat2       iasp91 # caucasus kyrghyz obn pakistan tanz_archean tanz_mobile
}