70 lines
2.3 KiB
ReStructuredText
70 lines
2.3 KiB
ReStructuredText
.. _scanloc-ttt:
|
|
|
|
Dense Travel-Time Tables
|
|
========================
|
|
|
|
The default travel time tables of SeisComP for :cite:t:`locsat` provide the
|
|
times in intervals of 1 degree epicentral distance. Thus, the curvature of the
|
|
travel-time curve at closer distance is not well imaged potentially resulting in
|
|
wrong locations or missing event solutions. Therefore, the LOCSAT tables,
|
|
*iasp91_scanloc*, based on the IASP91 model with higher spacial sampling are
|
|
added to the scanloc package. The table files are located in
|
|
:file:`$SEISCOMP_ROOT/share/locsat/tables`. They may be used along with scanloc
|
|
and any other module which uses LOCSAT travel-time tables such as :cite:t:`scolv`,
|
|
:cite:t:`scautoloc`, :cite:t:`screloc` or even the locator :cite:t:`stdloc`.
|
|
|
|
.. note::
|
|
|
|
gempa may provide additional travel-time tables as a service based on custom
|
|
velocity models. `Contact <https://www.gempa.de/contact/>`_ us for any
|
|
related request.
|
|
|
|
.. _fig-ttt-scanloc:
|
|
|
|
.. figure:: ../apps/media/ttt_scanloc_P_5km.png
|
|
:align: center
|
|
:width: 18cm
|
|
|
|
Differences between P-wave travel times in the standard iasp91 tables for LOCSAT
|
|
and the iasp91_scanloc tables provided with scanloc for an event at 5 km depth.
|
|
|
|
|
|
Application in scanloc
|
|
----------------------
|
|
|
|
Configure the scanloc parameters :confval:`association.table` and
|
|
:confval:`locator.profile` with *iasp91_scanloc* for using these LOCSAT tables
|
|
in scanloc along with LOCSAT:
|
|
|
|
.. code-block:: params
|
|
|
|
# Type of travel-time tables for phase association. May be different from locator.
|
|
# Use e.g. libtau or LOCSAT.
|
|
association.tableType = LOCSAT
|
|
|
|
# Name of travel-time table used for phase association. May be different from locator
|
|
# profile.
|
|
association.table = iasp91_scanloc
|
|
|
|
# The locator type to use
|
|
locator.type = LOCSAT
|
|
|
|
# The locator profile to use
|
|
locator.profile = iasp91_scanloc
|
|
|
|
Alternatively, you may use the tables along with :cite:t:`stdloc`.
|
|
|
|
|
|
Application in other modules
|
|
----------------------------
|
|
|
|
In order to visualize the travel times or for using the tables in applications
|
|
like :cite:t:`scolv` add the tables to your global module configuration:
|
|
|
|
.. code-block:: params
|
|
|
|
ttt.LOCSAT.tables = iasp91_scanloc
|
|
LOCSAT.profiles = iasp91_scanloc
|
|
|
|
More specific parameters may exist along with your application.
|