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. For more information about NAMSS, visit our about page.
These data are usually provided in SEG-Y format; specialized software is required to view these data. The data are accompanied by sparse metadata: at a minimum shotpoint location information in flat text files. Most surveys also have associate 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 digital images (tiff) of the reflection profile. The site attempts to include all metadata that were provided by the contributor.
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: https://walrus.wr.usgs.gov/namss/