National Geophysical Data Center
Navarin Basin-Northern Bering Sea-Alaska
USGS Open File Report 86-207
Data Announcement 86-MGG-25
Approximately 3,200-km of 24-channel seismic-reflection
profile data across the continental margin in the northeastern
Bering Sea are available for purchase from the National
Geophysical Data Center (NGDC) . These profiles were provided to
NGDC for public dissemination by the U.S. Geological Survey, U.S.
Department of Interior. This data set has 12 seismic lines (20
These profile data were collected during the summer of 1977
by the R/V S.P. LEE using a sound source of five airguns with a
volume of 1,326 cu. in. of air compressed to approximately 2,000
psi. The recording system consisted of a 24-channel streamer,
2400 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. The data
were later desampled to 4 msec during the demultiplexing process.
Record lengths vary from 6 to 12 sec, depending on water depth
and geologic structure, to give 6 to 8 sec of data below the
seafloor. Processing was handled at the USGS Pacific Marine
Geology Multichannel Processing Center in Menlo Park, California
in the sequence: editing-demultiplexing, velocity analysis, CDP
stacking, deconvolution-filtering, and plotting on an
electrostatic plotter. These seismic data are also available in
SEG-Y format as stacked or demultiplexed magnetic tapes.
Previous data offered by NGDC for the Navarin Basin are listed in
the Previous Data Announcements for the Navarin Basin section of
"Multichannel Seismic-Reflection Profiles Collected in 1977
in the Northern Bering Sea," Alan K. Cooper, Michael S. Marlow,
and Dennis M. Mann, USGS Geological Survey Open File Report 86-
207, U.S. Geological Survey, Dept. of Interior, Menlo Park, CA
Electrostatically Plotted Profiles (deconvolved and filtered
20 Lines (sections) available on plastic sepia, paper sepia
1 shot-point navigation map available in plastic sepia,
paper sepia and paper blackline.
1 shot-point navigation tape (9-track, 1600 bpi, ASCII).
This is also available on CD-ROM.
Digital Seismic Data:
16 Stacked Tapes
532 Demultiplexed Tapes
INQUIRIES ARE INVITED REGARDING THE AVAILABILITY AND PRICES OF
OTHER DATA IN THE ALASKA AREA.
Please contact NGDC for prices.