# homogeneous — SeisComP Release documentation

6.9.0

# homogeneous

Travel-times for a homogeneous velocity model

## Description

The travel-time interface homogeneous allows predicting travel times for P and S wave and homogeneous velocity models.

## Configuration

The travel-time interface homogeneous is controlled by global parameters, e.g., in `$SEISCOMP_ROOT/etc/global.cfg`:

1. Add a new table profile for homogeneous travel-time tables with some custom profile name. In scconfig navigate to the section ttt.homogeneous and click on the green button to add a table profile.

2. Set all parameters in the new profile.

3. Register the new profile by adding its name to the list of tables in `ttt.homogeneous.tables`

Example configuration:

    # The list of supported model names per interface.
    ttt.homogeneous.tables = "5"

    # Geographic origin of the region. Expects 2 values: latitude, longitude.
    ttt.homogeneous.5.origin = 51, 12

    # Radius validity of the region.
    ttt.homogeneous.5.radius = 1

    # Min Depth validity of the region.
    ttt.homogeneous.5.minDepth = 0

    # Max Depth validity of the region.
    ttt.homogeneous.5.maxDepth = 2

    # P wave velocity.
    ttt.homogeneous.5.P-velocity = 5

    # S wave velocity.
    ttt.homogeneous.5.S-velocity = 3

## Application

Once the travel-time interface profile is defined and registered, in can be selected

- interactively in the scolv phase picker or the scolv amplitude picker,

- or used in other modules which allow the configuration of travel-time interfaces.