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National Centers for Environmental Information (NCEI)

USGS Open File Report 86-405

Data Announcement 86-MGG-28

     Approximately 2,652 km of 24-channel seismic-reflection profiles in the Eastern Chukchi Sea for purchase from the National Geophysical Data Center (NGDC) (now the National Centers for Environmental Information (NCEI)). These data were collected in early September 1980 by the U.S. Geological Survey (USGS) Research Vessel S.P. LEE during Cruise L880AR. The USGS, Department of Interior has provided these profiles 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, 213 cu. in. of air compressed to approximately 1,900 psi. The recording system consisted of a 24-channel, 2,400-m long streamer 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 Magnavox Integrated navigation system using transit satellites and Doppler-sonar augmented by Loran C (Rho-Rho). A 2 msec sampling rate was used in seconds of data length were recorded. The sequential processing of data was editing-demultiplexing, velocity analysis, CDP stacking, deconvolution-filtering, and plotting on an electrostatic plotter. The seismic lines are available on plastic, paper sepia, paper blackline, or on magnetic tape. NGDC has additional multichannel seismic-reflection data in this area (see Data Announcements 82-MGG-10 and 86-MGG-17, and single-channel seismic- reflection data, Data Announcement 85-MGG-03).
     *"Multichannel Seismic-Reflection Data Collected in 1980 in the Eastern Chukchi Sea," Arthur Grantz, Dennis M. Mann, and Steven D. May, USGS Report 86-405, U.S. Geological Survey, Menlo Park, CA 94025.


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

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

Digital Geophysics Data:

     1 magnetic tape Shot-Point Navigation (9-track, 1600 bpi, ASCII). This is also available on CD-ROM.

     1 magnetic tape with gravity data (9-track, 1600 bpi, ASCII)

CDP Stack Tapes:

     13 Demultiplexed digital magnetic tapes (in SEG-Y format)
     313 Sort tapes