National Centers for Environmental Information (NCEI)

MULTICHANNEL SEISMIC-REFLECTION PROFILES Western Gulf of Alaska USGS Open File Report 84-7

Data Announcement 84-MGG-11

     Approximately 2,382 line km of 24-channel seismic-reflection profiles from the western Gulf of Alaska. The profiles were collected during the summer of 1977 on the U.S. Geological Survey (USGS) Research Vessel S.P. LEE using a sound source of five airguns with a volume of 1,326 cu. in. of air compressed to approximately 1,900 psi. The recording system consisted of a 24-group streamer, 2,400 m long and a GUS (Global Universal Science) model 4200 recording instrument. Shots were fired every 50 m and the group interval was 100 m. A 2-msec sampling rate was used in the field and the data were later desampled to 4 msec during the demultiplexing process. Navigational control for the survey was by a Marconi integrated satellite/doppler sonar navigation system. Record lengths vary from 7 to 13 sec, depending on water depth with 6- to 7-sec recorded penetration below the seafloor. The U.S. Geological Survey, Dept. of Interior, has provided these data to NGDC (now NCEI) for public dissemination.
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* "Multichannel Seismic-Reflection Profiles Collected in 1977 in the Western Gulf of Alaska," Dennis M. Mann and Roland E. VonHeune, 1984, U.S. Geological Survey, Dept. of Interior, Menlo Park, CA 94025.

DATA AVAILABILITY

     Electrostatically plotted profiles which have been deconvolved and filtered after stacking:

         36 sections available in plastic sepia, paper sepia, and blackline.

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

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