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.