|U.S. Geological Survey Data Series 238|
The map documents and shapefiles used to create the trackline maps provided in this report can be found in the arc.zip file located in the ARC folder. This folder also contains a read-me file that describes the GIS project in detail. The map documents were created using ESRI ArcGIS 8.3 software. The shapefiles provided may also be viewed using other versions of ArcView, ArcGIS, or public domain software ArcExplorer (http://www.esri.com/software/arcexplorer/index.html).
Seismic Unix (SU) is a public domain seismic processing software package written and maintained by the Center for Wave Phenomena at the Colorado School of Mines in Golden, Colorado. The web site for SU is http://www.cwp.mines.edu/cwpcodes/index.html. SU is compatible with both UNIX and LINUX operating systems. The SU scripts provided on this disc were modified from scripts written by the USGS Seafloor Mapping Group in Woods Hole, Massachusetts, and run on a LINUX workstation. These SU scripts are located in the tar files boom.tar and chirp.tar, which can be found in the SU folder. These scripts are provided as examples only. They may need to be modified to run on another system. They also require the use of shareware programs such as ImageMagick and Ghostscript.
The example SU scripts will allow the user to strip off unique navigation fixes from the SEG-Y headers, along with a fix for every 500 or 1,000 shots, and produce a filtered and gained GIF image of each profile. These images can then be displayed using a variety of shareware programs, such as ImageMagick (UNIX, LINUX) or a web browser.
Instructions on how to download the SEG-Y data files are provided.
DUMPSEGY.EXE is a DOS seismic data utility that allows the user to examine components of the SEG-Y data files (Zihlman, 1992): the EBCDIC and binary headers, the individual data trace headers, and the hexadecimal SEG-Y samples composing a data trace, or their actual floating point values. The DUMPSEGY.TXT file is the original open-file report that gives detailed instructions on how to use DUMPSEGY.EXE. The DSGYNEWS.TXT file describes the upgrades to the original program. These files are all located in the USGS folder. Please refer to DUMPSEGY.TXT and DSGYNEWS.TXT for further information and instruction.