USGS Marine Seismic Data
To download the data, visit the USGS National Archive of Marine Seismic Surveys and search for surveys in the map. Filters can be applied to make searching the map easier.
Many 2D and 3D surveys around the United States are available with lines in SEG Y format and accompanying navigation data. Some surveys contain only images stored in a PDF document.
"Data are provided with free and open access" with the suggested citation:
Triezenberg, P. J., Hart, P. E., and Childs, J. R., 2016, National Archive of Marine Seismic Surveys (NAMSS): A USGS data website of marine seismic reflection data within the U.S. Exclusive Economic Zone (EEZ): U.S. Geological Survey Data Release, doi: 10.5066/F7930R7P.