NAMSS currently holds 40 3D seismic surveys covering 26,199 square kilometers and 463 2D seismic surveys with 25,229 tracklines covering 1,595,324 kilometers. NAMSS is continuously updated as data becomes available. For more information about NAMSS, visit our about page.
Most data are provided in SEG-Y format, (Barry, K. M., Cavers, D. A. and Kneale, C. W., 1975, Report on recommended standards for digital tape formats: GEOPHYSICS, 40, no. 02, 344-352, a copy of which can be found at: http://www.seg.org/resources/publications/misc/technical-standards/.) Specialized software is required to view SEG-Y data. A list of free software that can be used to visualize, analyze, and interpret 2D and 3D SEG-Y data can be found here. Data in the archive have associated metadata: at a minimum shotpoint location information in flat text files. Most surveys also have more complete metadata in the form of text reports and digital images (TIFF) of analog side-labels showing acquisition and in some cases processing parameters. Some profiles are represented by TIFF images of the reflection profile (not digital SEG-Y data). The site attempts to incorporate all metadata that were provided by the contributor. The metadata can be generated in an ISO-compatible XML template consistent with the metadata standard described at: http://www.ngdc.noaa.gov/mgg/ecs/metadata/seismic/
While shotpoint location information is largely complete for all surveys, there may be gaps or erroneous locations and mismatches with the seismic traces. Not all datasets have been quality-controlled to ensure complete correlation between shotpoint locations and seismic profiles.
We request acknowledgement of the data provider and the USGS in all instances of publication or reference. We suggest using the following text:
The authors acknowledge (the data provider) and the U.S. Geological Survey for providing the seismic reflection data for the purpose of this research. For further information please visit: http://walrus.wr.usgs.gov/NAMSS/