FORWARD MODELING CODES
I. Traveltime Modeling Codes
1. Ray Tracing for 2-D and 3-D Media
Author: Yonghe Sun (1991)
Tracing transmission rays in 2-D and 3-D slowness media.
"ray3.f" = ray tracing code;
"rays.f" = subroutine code;
"demo.1d" = 1-D input & output demo;
"demo.3d" = 3-D input & output demo.
2. Traveltime Calculation in a 2-D TI Medium by Huygens' Principle
Author: Fuhao Qin (1992)
Traveltime calculation for quasi-P, quasi-SV and SH waves in a (2-D) TI medium by Huygens' principle.
"aneik.f" = traveltime computing code;
"anmod.f" =model builder;
"aneik.in" ; "anmod.in" = input files.
3. Finite-Difference Solution to the 2-D Eikonal Equation
Author: Fuhao Qin (1992)
First arrival traveltime calculation for 2-D isotropic media.
"eik.f" = traveltime computing code;
"ineik" = input file;
"mod.f" = model builder;
"inmod" = input to mod.f.
4. Finite-Difference Solution to the 3-D Eikonal Equation: Version 1.0
Authors: Wenying Cai and Fuhao Qin (1991)
Computing traveltimes in 3-D isotropic media by a finite-defference solution to the 3-D eikonal equation.
"eik3d.f" = traveltime computing code;
"eik3d.in" = input file;
5. Finite-Difference Solution to the 3-D Eikonal Equation: Version 1.1
Updated by Jianming Sheng, Min Zhou and Chaiwoot Boonyasiriwat (2006)
Computing traveltimes in 3-D isotropic media by a finite-defference solution to the 3-D eikonal equation.
"main.f" = the main program;
"front3d.f" = 3D Eikonal solver subroutines;
"model_param.h" = Model parameter file;
"Makefile" = GNU Makefile for this package;
"viewtime.m" = Matlab script for viewing the traveltime file;
"time.png" =Image of the 3D traveltime produced by Matlab;
6. Shortest path Matlab codes
Author: Ruiqing He (2002)
Computing first arrival traveltime.
"Mray.m" = Matlab source code;
II. Wavefield Modeling Codes
1. Finite-Difference Solution to the 2-D Acoustic Wave Equation
Authors: Jerry Schuster (1989) and Jinlong Xu
Modeling of 2-D borehole acoustic synthetic seismograms by a 2-4 finite-difference solution to the 2-D acoustic wave equation.
The accuracy is 2nd-order in time and 4th-order in space, and code can handle
irregular free-surfaces.
"pp4.f" = modeling code;
"indat" = input file;
"mod.f" = model builder;
"inmod" = input to mod.f;
"doconvert" = execution file to call convert code;
"ftsu.f" = convert code which can be used to conver Fortran unformatted data to SU format data or reverse;
"segy.com" = include file for convert code;
"ftr.dat.in" = input file for convert code, contains trace number and sample interval;
2. Finite-Difference Solution to the Axisymmetric Acoustic Wave Equation
Author: Jinlong Xu (1993)
Modeling of axisymmetric borehole acoustic synthetic seismograms by a 2-4 finite-difference solution to the axisymmetric acoustic wave equation. The accuracy is 2nd-order in time and 4th-order in space.
"pp425.f" = modeling code;
"indat" = input file;
"mod.f" = model builder;
"inmod" = input to mod.f.
3. Finite-Difference Solution to the 3-D Acoustic Wave Equation
Author: Kim Bak Olsen (1992)
Modeling of 3-D acoustic synthetic seismograms by 2-4 finite-difference solution to the 3-D acoustic wave equation. The accuracy is 2nd-order in time and 4th-order in space.
"fd3dac.f" = modeling code;
"hom3d.f" = earth model builder;
4. Finite-Difference Solution to the 2-D P-SV Wave Equation
Authors: Yi Luo, Jerry Schuster (1989) and Jinlong Xu
Modeling of 2-D P-SV synthetic seismograms by a 2-4 finite-difference solution to the 2-D elastic wave equation. The accuracy is 2nd-order in time and 4th-order in space.
"psvr4.f" = modeling code;
"indat" = input file;
"mod.f" = model builder;
"inmod" = input to mod.f.
5. Finite-Difference Solution to the 2-D SH wave Equation
Author: Jinlong Xu (1992)
Modeling of 2-D SH elastic synthetic seismograms by a 2-4 finite-difference solution to the 2-D SH elastic wave equation. The accuracy of the code is 2nd-order in time and 4th-order in space. This program can also model the SH response of free-surfaces with irregular geometry.
"sh4.f" = modeling code;
"indat" = input file;
"mod.f" = model builder;
"inmod" = input to mod.f.
6. Finite-Difference Solution to the 2-D TI Elastic Wave Equation
Author: Fuhao Qin (1992)
Modeling of TI elastic synthetic seismograms by a 2-4 finite-difference solution to the 2-D TI elastic wave equation. The accuracy is 2nd-order in time and 4th-order in space.
"an2dh.f" = modeling code(Z);
"an2dv.f" = modeling code(X);
"inmod" = input to mod.f.
7. Finite-Difference Solution to the 3-D Elastic Wave Equation (Cray)
Author: Kim Bak Olsen (1991)
Modeling of 3-D synthetic seismograms by a 2-4 finite-difference solution to the 3-D elastic wave equation, optimized for CRAY supercomputers with a Solid State Device (SSD). The accuracy is 2nd-order in time and 4th-order in space.
"fd3d2.f" = modeling code;
"hom3d.f" = model builder;
8. Finite-Difference Solution to the 3-D Elastic Wave Equation (IBM)
Author: Kim Bak Olsen (1991)
Modeling of 3-D synthetic seismograms by a 2-4 finite-difference solution to the 3-D elastic wave equation, optimized for multi processor IBM3090 supercomputers with Extended Memory and is set up for an MVS enviroment. The accuracy is 2nd-order in time and 4th-order in space.
"table' ; "in3d" = input files;
9. Separation of 2-D P-Waves and S-Waves
Author: Kim Bak Olsen (1991)
Separation of a 2-D elastic wavefield into P-energy and S-energy.
"sep.f" =separation code.
10. Finite-Difference Solution to the 2-D P-SV Wave Equation Using An Adaptive Grid
Author: Xu Ji (1994)
Modeling of 2-D P-SV synthetic seismograms by a 2-4 finite-difference solution to the 2-D elastic wave equation using the adaptive grid method. The accuracy is 2nd-order in time and 4th-order in space.
"mod.f" = model builder;
"model" = input to mod.f;
11.Finite-Difference Solution to the 2-D Acoustic Wave Equation Using An Adaptive Grid
Author: Yue Wang (1996)
Modeling of 2-D acoustic pressure synthetic seismograms by a 2-4 adaptive staggered grid solving finite-difference solution to the 2-D acoustic wave equation. The accuracy is 2nd-order in time and 4th-order in space.
"ap4.f" = modeling code;
"indat" = input file;
"mod.f" = model builder; "ap4.inc" = include file.
12. Finite-Difference Solution to the Axisymmetric Viscoelastic Wave Equation
Author: Yue Wang (1995)
Modeling of axisymmetric viscoelastic synthetic seismograms by a 2-4 staggered grid finite-difference method. The accuracy is 2nd-order in time and 4th-order in space.
13. Finite-Difference Solution to the 2-D P-SV Wave Equation Using An Adaptive Grid with Conservation Flux Condition
Author: Yue Wang (1996)
Modeling of 2-D P-SV synthetic seismograms by a 2-4 finite-difference solution to the 2-D elastic wave equation using the adaptive grid method with conservation flux condition. The accuracy is 2nd-order in time and 4th-order in space.
"ae2d.f" = modeling code;
"indat" =input file;
III. Electromagnetic Finite-Difference Modeling
Finite-Difference Solution to the 2-D Maxwell's Equation
Author: Jerry Schuster and Wenying Cai (1990)
Modeling of 2-D synthetic electrograms by a 2-4 staggered finite-difference solution to the 2-D Maxwell's equation. The accuracy is 2nd-order in time and
4th-order in space.
"em2d.f" = modeling code;
"mod.f" = model builder;
"indat" = input file;
"inmod" = input to mod.f.
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