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The following pages contain thumbnail images of all seismic reflection profiles collected during USGS Field Activities 01ASR01, 01ASR02, 02ASR01, and 02ASR02. To view a profile, click on the desired thumbnail, and a full-size version will appear. The profiles, which are stored as GIF images by trackline number, can also be found in the Field Activity ID subfolders of the PROFILES folder located at the top level of these CD-ROMs.
These profiles were produced using Seismic Unix software provided by the Colorado School of Mines. The data was processed using a bandpass filter of 300-500-2500-3000 Hz and then gained.
The field SEG-Y data files may be processed and plotted using seismic processing software such as Seismic Unix. Seismic Unix is Unix/Linux public domain software provided by the Colorado School of Mines and is currently located at http://www.cwp.mines.edu/cwpcodes. A Linux tar file (boom.tar) containing examples of Seismic Unix scripts is provided in the SEISUNIX subfolder of the SOFTWARE folder located at the top level of these CD-ROMs.
HOW TO DOWNLOAD THE SEG-Y DATA FILES:
Note: The web version of this archive does not contain the SEG-Y Trace files. These files are very large and would require extremely long download times. To obtain a complete copy of this archive on CD-ROM, contact USGS Information at (888) ASK-USGS.
The seismic data files are binary encoded and cannot be viewed directly. Attempts to view the files in a text window or browser will result in long loading times and unrecognizable characters being displayed. For this reason, the best way to download the data files is to NOT use a WWW browser. To download the data, open the SEGY folder located at the top level of these CD-ROMs, select the SEG-Y files you wish to download, and either drag and drop these files onto your hard drive or use the copy command. The SEG-Y formatted files have a .TRA extension. The files with a .PAR extension are parameter files used by Delph Seismic software. There is no need to download the .PAR files unless you are using Delph Seismic software to play back the data. The UTM_401_1.pln file is also for use by the Delph Seismic software to play back the data.
WARNING: These files can be very large.
A detailed description of the SEG-Y data format has been provided.
Formal Federal Geographic Data Committee (FGDC) metadata for the seismic reflection data and for accompanying shotpoint navigation maps has been provided.