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U. S. Department of the Interior, U. S. Geological Survey

Program 3DTOM for Crosswell Radar and Seismic Tomography

Daryl R. Tweeton (of the former U.S. Bureau of Mines)

Open-File Report 00-456

URL: http://greenwood.cr.usgs.gov/pub/open-file-reports/ofr-00-0456/

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1. Overview

Before the U.S. Bureau of Mines closed, several of its geophysicists 
developed computer programs to process crosswell seismic and radar 
data. To make these programs readily available to the public, the 
programs and the associated reports are stored as USGS Open-File 
Reports on a website operated by the U.S. Geological Survey. This 
particular open-file report pertains to the program "3DTOM" and the 
report "3DTOM - Three-dimensional geophysical tomography" (Jackson 
and Tweeton, 1996). The program executes on a personal computer using 
the DOS operating system; the program is not maintained.

This file 'OFR.TXT' describes
   (a) The contents of the zip file (section 2).
   (b) Software needed to read the report (section 3).
   (c) Special remarks on the executable program (section 4).

If you want some additional information regarding 3DTOM, please 
contact:

   Daryl Tweeton
   Telephone number: (952) 423-3838
   Fax number: (952) 926-5498
   E-mail tweetond@tc.umn.edu

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2. Contents of the Zip File

The files for the program and the associated report are stored in 
3dtom.zip, which is a compressed file. Software to uncompress this zip
file is available at http://www.winzip.com.

    Files         Remarks
    ------------  ---------------------------------------------
    3dtom.shr
    source.shr
    setup.exe
    setup.cfg
    readme.txt    This file contains instructions on installing
                  program 3DTOM.
    install.exe
    demo2.shr
    demo1.shr
    bgi.shr
    usbm.bmp
    3DTOMR.EXE    See section 4 below.
    ofr.txt       This file contains a copy of this open-file report.
    ri9617.pdf    This file contains the report "3DTOM - Three-
                  Dimensional geophysical tomography," which has 
                  extensive information on the program.

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3. Software Needed to Read the Report

File "ri9617.pdf" can be read only with the program 
"Adobe Acrobat Reader," which may be obtained for free at
http://www.adobe.com. 

System requirements for Acrobat Reader 4.0 for Windows:
   i486 or Pentium processor-based personal computer
   Microsoft Windows 95, Windows 98, or Windows NT 4.0 with Service
      Pack 3 or later
   8 MB of RAM on Windows 95 and Windows 98 (16 MB recommended)
   16 MB of RAM on Windows NT (24 MB recommended)
   10 MB of available hard disk space

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4. Special Remarks on the Executable Program

The original 3DTOM.EXE does not work with modern computers because 
a problem with the Pascal compile makes the timing delay loop go too 
fast.  This problem was overcome using a compiler patch, and the 
recompiled version is called 3DTOMR.EXE. Only this executable program
should be used. 

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5. Disclaimer

Program 3DTOM and the associated report were prepared by an agency of 
the United States Government. Neither the United States Government nor
any agency thereof nor any of their employees makes any warranty, 
expressed or implied, or assumes any legal liability or responsibility
for the accuracy, completeness, or usefulness of any information, 
apparatus, product, or process disclosed in this report or represents 
that its use would not infringe privately owned rights. Reference 
therein to any specific commercial product, process, or service by 
trade name, trademark, manufacturer, or otherwise does not constitute 
or imply its endorsement, recommendation, or favoring by the United 
States Government or any agency thereof.

No warranty, expressed or implied, is made by the USGS as to the 
accuracy of the data and related materials and (or) the functioning 
of the software. The act of distribution shall not constitute any 
such warranty, and no responsibility is assumed by the USGS in the 
use of these data, software, or related materials.

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6. Acknowledgements

Robert Bisdorf scanned the pages of the original report. Karl Ellefsen
organized the publication of this open-file report.

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7. Reference

Jackson, M. J., and Tweeton, D. R., 1996, 3DTOM - Three-dimensional
geophysical tomography: USBM Report of Investigation 9617, 52 p.

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