/***************************************************************************
 *   Copyright (C) by ETHZ/SED                                             *
 *                                                                         *
 * This program is free software: you can redistribute it and/or modify    *
 * it under the terms of the GNU Affero General Public License as published*
 * by the Free Software Foundation, either version 3 of the License, or    *
 * (at your option) any later version.                                     *
 *                                                                         *
 * This program is distributed in the hope that it will be useful,         *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of          *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           *
 * GNU Affero General Public License for more details.                     *
 *                                                                         *
 *                                                                         *
 *   Developed by Luca Scarabello, Tobias Diehl                            *
 *                                                                         *
 ***************************************************************************/

rtDD is a SeisComP extension module that implements Double-Difference event relocation both in Real-Time, one event at the time, and classic offline mode, where an earthquake catalog is relocated as a whole.

rtDD contains a C++ library for double-difference inversion which doesn't depend on SeisComP and can be used in other systems.

The actual methods are based on the paper "Near-Real-Time Double-Difference Event Location Using Long-Term Seismic Archives, with Application to Northern California" by Felix Waldhauser and "A Double-Difference Earthquake Location Algorithm: Method and Application to the Northern Hayward Fault, California" by Waldhauser & Ellsworth.

The double-difference equation system solver uses LSQR by Chris Paige, Michael Saunders and LSMR by David Fong, Michael Saunders algorithms from this Apache Licensed beautiful implementation by Tom Vercautereen.

rtDD also supports NonLinLoc by Anthony Lomax grid file format alongside the travel time formats natively supported by SeisComP (LOCSAT and libtau). A feature that enables 3D velocity models within the tool.

rtDD acknowledges support from Geothermica

You can find the online documentation at https://docs.gempa.de/scrtdd/current/

You can find compiled version of this module at https://data.gempa.de/packages/Public/. The installation file is a compressed tar archive containing the binary distribution of this module, which can be extracted in your SeisComP installation folder.

In order to use this module the sources have to be merged into the SeisComP sources, then SeisComP can be compiled and installed as usual. Follow the up-to-date procedure at https://github.com/SeisComP/seiscomp

#
# get SeisComP (follow official documentation)
#
git clone https://github.com/SeisComP/seiscomp.git seiscomp
cd seiscomp/src/base
git clone https://github.com/SeisComP/common.git
git clone https://github.com/SeisComP/main.git
[...etc...]

#
# Add rtdd into SeisComP
#
cd seiscomp/src/extras
git clone https://github.com/swiss-seismological-service/scrtdd.git
cd scrtdd

#
# Compile code as per SeisComP official documentation
#
...

To update rtDD to a new version:

#
# go to rtDD folder
#
cd seiscomp/src/extras/scrtdd

#
# fetch the changes that happened on rtDD repository
#
git fetch origin -p --tags

#
# checkout the new version
#
git checkout master
git rebase origin/master