SOFTWARE - ARCHIVE OF DIGITAL BOOMER AND CHIRP SEISMIC REFLECTION DATA COLLECTED DURING USGS CRUISES 01RCE05 AND 02RCE01 IN THE LOWER ATCHAFALAYA RIVER, MISSISSIPPI RIVER DELTA, AND OFFSHORE SOUTHEASTERN LOUISIANA, OCTOBER 23-30, 2001, AND AUGUST 18-19, 2002

ArcView Project

The GIS project used to create the trackline maps and a readme.txt file that describes the project in detail can be found in the ARC folder. The project is contained in an arc.zip file and is composed of ESRI ArcView map documents and shapefiles. The map documents were created with ESRI GIS software ArcView 8.1 and are compatible with ArcGIS 8.1 (Windows). The shapefiles, created with ArcView 3.2 and 8.1, may also be viewed using other versions of ArcView or public domain software ArcExplorer 2.0 (Windows) and 4.0 (Windows, Mac OS X, Unix, Linux), available from the ESRI website at http://www.esri.com/software/arcexplorer/.

Seismic Unix Scripts

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/. 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.

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 (boomer) or 1,000 (chirp) 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.

For instructions on how to download the SEG-Y data files, click here.

USGS Software

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 infomation and instruction.

Reference

Zihlman, F.N., 1992, DUMPSEGY V1.0: A program to examine the contents of SEG-Y disk-image seismic data: U.S. Geological Survey Open-File Report 92-590, 28 p.