The seismic data for this study and most of the stacking velocities were provided to the U.S. Bureau of Ocean Energy Management by companies that collected the original data. The data are now more than 25 years old and are in the public domain. The Bureau of Ocean Energy Management, DOE-USGS Interagency Agreement DE-FE0002911, and the USGS Gas Hydrates Project supported this research. Laura Brothers was also supported by a DOE National Energy Technology Laboratory/National Research Council Methane Hydrate Fellowship under DE-FC26-05NT42248 to conduct this research from 2010 to 2012.
This shapefile was formulated for the purpose of delineating the 2000 meter per second (m/s) contour for average sediment velocities calculated for the first 750 milliseconds of two-way travel time from legacy seismic reflection records collected near the Alaskan coastline bordering the U.S. Beaufort Sea. The 2000 m/s averaged sediment velocity contour is interpreted as the contemporary seaward extent of ice-bearing permafrost (subsea permafrost) on the U.S. Beaufort Sea margin (Arctic Ocean) offshore northern Alaska.
Are there legal restrictions on access or use of the data?
Access_Constraints: None. Please see 'Distribution Info' for details.
Use_Constraints:None. Users are advised to read the data set's metadata thoroughly to understand appropriate use and data limitations.
Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
|Data format:||The Zip file contains the polyline shapefile for the minimal offshore extent of ice-bearing (subsea) permafrost on the U.S. Beaufort Sea margin, along with the FGDC CSDGM metadata in various formats and the browse graphic. in format Shapefile (version ArcGIS 9) Esri polyline Shapefile Size: 3|
These data are available in Esri shapefile format. The user must have software capable of reading this format. The data are available for download in zip format, which requires software to extract the files from the zip archive.