INVERSION CODES

1. Traveltime Inversion Algorithm Based on the Eikonal Equation

Author: Fuhao Qin (1992)

Modeling and inverting crosshole first arrival traveltime data based on a finite-difference eikonal equation solver.

"README" = readme file;

"inveik.f" = inverse code; "ineik" ; "inveik.in" = input files;

"mod.f" = model builder; "inmod" = input to mod.f.

2. Refraction Traveltime Tomographic Inversion in 2-D Media

Author: Fuhao Qin and Wenying Cai (1991)

Turning ray tomography for first arrival traveltime data from surface seismic survey.

"README" = readme file;

"refra-2d.f" = inverse code; "refra-2d.in";"coord.temp" = input files.

3. Refraction Traveltime Tomographic Inversion in 3-D Media

Author: Wenying Cai and Fuhao Qin (1993)

Turning ray tomography for first arrival traveltime data from a surface seismic survey.

"README" = readme file;

"refra-3d.f" = inverse code; "refra-3d.in" = input file;

"eik3d_sub.f" ; "smooth3d.f" = subroutines.

4. Acoustic Wave Equation Traveltime and Waveform Inversion

Author: Changxi Zhou (1993)

The code has two functions: (1) forward modeling using finite difference scheme to solve acoustic wave equation with 2nd-order accuracy in time and 4th-order in space;(2)velocity inversion using cross-well seismic data employing 4-2 finite difference scheme.

"README" = readme file; "wtw-gen.f" = inverse code;

"wtw.pa" = include file; "velin" = velocity input file when doing forward modeling;

"wtw.in" = input file when doing forward modeling; "wtw.in" = input file when doing inversion;

"coord.peak" ; "hold.wtw" = input files when doing inversion.

5. Love Surface Wave Inversion

Author: Yonghe Sun (1992)

Computing or inverting the fundamental mode dispersion curve of Love surface wave.

"README" = readme file;

"dinvrtl.f" = inverse code; "inLove.dat" = input file;

"dsvdc.f" ; "daxpy.f" ; "ddot.f" ;"dnrm2.f" = subroutine files;

"drot.f" ; "drotg.f" ; "dscal.f" ; "dswap.f" = subroutine files.

6. Rayleigh Surface Wave Inversion

Author: Yonghe Sun (1992)

Computing or inverting the fundamental mode dispersion curve of Rayleigh surface wave.

"README" = readme file;

"dinvrtr.f" = inverse code; "inRayl.dat" = input file;

"dsvdc.f" ;"daxpy.f" ;"ddot.f" ; "dnrm2.f" = subroutine files;

"drot.f" ;"drotg.f" ; "dscal.f" ;"dswap.f" = subroutine files.

7. PC_GUI

Refraction Traveltime Tomographic Inversion in 2-D Media using matlab graphic user interface (GUI), windows (PC) version

"PC_GUI.zip" (11M);

"drygulch.tar" (8M) an example in drygulch, Utah;

"README".

8. 3D Refraction Traveltime Tomography

Updated by Shengdong Liu(2011)

Refraction Traveltime Tomographic Inversion in 3-D Media.

"SOURCE CODE" ;

"EXAMPLE".