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National Centers for Environmental Information (NCEI)


East Chukchi Sea-Alaskan OCS
USGS Open File Report 86-206*

Data Announcement 86-MGG-17

Approximately 2,520-km of 24-channel seismic-reflection data for the East Chukchi Sea for purchase from the National Geophysical Data Center (NGDC) (now the National Centers for Environmental Information (NCEI)). The data were collected in late August through September 1978 by the U.S. Geological Survey (USGS) R/V S.P. LEE. The USGS has provided these data to NGDC (now NCEI) for public dissemination.

The seismic-energy source consisted of a tuned array of five airguns with a total volume of 1,326 cu. in. of air compressed to approximately 1,900 psi. The recording system consisted of a 24- channel streamer, 2,400 m long with a group interval of 100 m and a GUS (Global Universal Science) model 4200 digital recording instrument. Shots were fired every 50 m. Navigational control for the survey was provided by a Marconi-integrated navigation system using transit satellites and Doppler-sonar augmented by Loran C (Rho-Rho). A 2-msec sampling rate was used in the field and the data were later desampled to 4-msec during the demultiplexing process. Recorded data length was 8 sec. The data are available as electrostatically plotted profiles which have been deconvolved and filtered after stacking. The seismic lines are available on plastic, paper sepia, or paper blackline. NGDC (now NCEI) has additional multichannel seismic reflection data (see Data Announcement 82-MGG-10) and single-channel data (see Data Announcement 85-MGG-03) in this area.
     *"Multichannel Seismic-Reflection Data Collected in 1978 in the Eastern Chukchi Sea," Arthur Grantz, Dennis M. Mann, and Steven D. May, Geological Survey, U.S. Department of the Interior, Open-file Report 86-206.


     East Chukchi Sea Multichannel Seismic-Reflection Data:

         26 tracklines/29 sections, 2,520 km available in plastic sepia, paper sepia, and blackline.

         1 trackline chart available in plastic sepia, paper sepia, or blackline.

         1 magnetic tape - digital shot-point navigation (9-track, 1600 bpi, ASCII). This is also available on CD-ROM.