skip navigation link

National Centers for Environmental Information (NCEI)

Beaufort and Chukchi Seas - Alaskan Outer Continental Shelf

Data Announcement 82-MGG-10

Approximately 5,700 line km of 24-channel seismic reflection data over the Continental shelf, slope, and rise in the Beaufort Sea and the Continental Shelf in the Chukchi Sea north of Alaska. The data were collected from the U.S. Geological Survey (USGS) Research Vessel SAMUEL P. LEE from late August through early October 1977.*

The seismic energy source consists of a tuned array of 5 airguns with a total volume of 1,326 cubic inches of air compressed to approximately 1,900 psi. Shots were fired every 50 m and the group interval was 100 m. The survey was positioned by a Marconi- integrated satellite-Doppler sonar navigation system. Record lengths vary from 6 to 11 sec, depending on water depth, to obtain data 6 to 7 sec below the seafloor. The USGS has provided these data to the National Geophysical Data Center (NGDC) (now the National Centers for Environmental Information (NCEI)) for public dissemination.

* Tracklines of multichannel seismic-reflection data collected by the U.S. Geological Survey in the Beaufort and Chukchi Seas in 1977 for which profiles and stack tapes are available, by Arthur Grantz, Dennis M. Mann and Steven D. May, USGS Open-File Report 82-651.


1. Multichannel Common Depth Point data for 92 seismic sections from 89 lines. Available in plastic sepia, paper sepia, blackline, and 35-mm microfilm (Reel No. 1767).

2. Post-Plot Navigation Maps:

     a. OFR 82-735 trackline. Available in plastic sepia, paper sepia, and blackline.

3. Velocity analysis and scans - 3 reels of 16-mm microfilm:

Digital Navigation is available separately on magnetic tape
    9-track, 1600 bpm, ASCII. This is also available on CD-ROM.

Digital Velocity - Time Pairs on magnetic tape
    9-track, 1600 bpi, ASCII

    Also available as printout

    Reel No. 1777 - Lines 702-725
    Reel No. 1778 - Lines 726-768
    Reel No. 1779 - Lines 769-783