Code for geophysical 2D Finite Difference modeling, 2d/3D x-w migration and utilities
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README

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THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS COMMON PUBLIC LICENSE ("AGREEMENT"). ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.

A copy of this license can be found in the file 'Common_Public_License.txt' in the directory where you have found this README.

http://www.opensource.org/licenses/cpl1.0.php

Some routines are from Seismic Unix and include the SU LEGAL_STATEMENT in the source code.
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Copyright (c) 2017 by the Society of Exploration Geophysicists.
For more information, go to http://software.seg.org/2017/00XX .
You must read and accept usage terms at:
http://software.seg.org/disclaimer.txt before use.

REFERENCES
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-1- If the Finite Difference code has helped you in your research please refer to our paper in your publications:

Finite-difference modeling experiments for seismic interferometry
Jan Thorbecke and Deyan Draganov
2011, Geophysics, Vol. 76, no. 6 (November-December); p H1--H18, doi: 10.1190/GEO2010-0039.1

-2- If the Machenko code has helped you in your research please refer to our paper in your publications:

Implementation of the Marchenko method
Jan Thorbecke, Evert Slob, Joeri Brackenhoff, Joost van der Neut, and Kees Wapenaar
2017, Geophysics, Vol. 82, no. 6 (November-December); p. WB29--WB45, doi: 10.1190/GEO2017-0108.1

These papers can be downloaded from:

http://janth.home.xs4all.nl/Publications/Publications.html


INSTALLATION
-------------

1) To compile and link the code you first have to set the ROOT variable in the Make_include file which can be found in the directory where you have found this README.
You can use Make_include_template as a first start: cp Make_include_template Make_include

2) Check the compiler and CFLAGS options in the file Make_include and adapt to the system you are using. The default options are set for a the GNU C-compiler on a Linux system. A Fortran or C++ compiler are not needed to compile the code. The Makefile has been tested with GNU make. 

3) If the compiler options are set in the Make_include file you can type 

> make 

and the Makefile will make:

- FFT library 
- fdelmodc
- marchenko
- utils

The libraries will be placed in the lib/ directory and the executables in the bin/ directory.

To use the executables don't forget to include the pathname in your PATH:

bash/sh:
export PATH='path_to_this_directory'/bin:$PATH:
csh:
setenv PATH 'path_to_this_directory'/bin:$PATH:

*** FOR SU USERS:
If you want to use the .su files with SU from CWP:
==> Please make sure that SU is compiled without XDR (in $CWPROOT/Makefile.config make sure that XDRFLAG is NOT set). The SU output files of fdelmodc are all based on local IEEE data.
*** 

> make clean

Finite Difference Modeling: FDELMODC
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If the compilation has finished without errors and produced an executable called bin/fdelmodc you can run one of the demo programs by running

> ./fdelmodc_plane.scr

in the directory fdelmodc/demo/ 

The demo directory contains scripts which demonstrate the different possibilities of the modeling program. 

To reproduce the Figures shown in the GEOPHYICS manuscript "Finite-difference modeling experiments for seismic interferometry" the scripts in FiguresPaper directory can be used. Please read the README in the FiguresPaper directory for more instructions and guidelines. 


Marchenko method : MARCHENKO
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If the compilation has finished without errors and produced an executable called bin/marchenko you can run one of the demo programs by running a set of scripts that are explained in a README in one of the directories marchenko/demo/*

To reproduce the Figures shown in the GEOPHYICS paper "Implementation of the Marchenko method" the scripts in marchenko/demo/oneD directory can be used. The README in this directory gives more instructions and guidelines. 

To reproduce the Figures shown in the Scientific Reports paper "Virtual acoustics in inhomogeneous media with single-sided access" the scripts in marchenko/demo/ScientificReports directory can be used. The README in this directory gives more instructions and guidelines. 

MISC
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Other make commands which can be useful:

make clean : removes all object files, but leaves libraries and executables
make realclean: removes also object files, libraries and executables.


UPDATES AND LATEST VERSION
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The latest version of the source code and manual can be found at:

http://www.xs4all.nl/~janth/Software/Software.html

 or at github:

git clone https://github.com/JanThorbecke/OpenSource.git

The code is used by many different people and if there is a request for a new option in the code, then I will try to implement, test and make it available.