Figure 28. The U.S. EEZ Gulf of Alaska area GLORIA sidescan-sonar mosaic.

Background

The GLORIA data for the U.S. EEZ Gulf of Alaska area were acquired during five cruises made during a four year period and covers a total area of approximately 806,000 sq km of seafloor. The first cruise conducted in 1986 (F-1-86-GA) surveyed an area of the north-central mosaic area and covered an area of approximately 40,000 sq km. The second two cruises (F-8-88-AA, F-9-88-WG) were conducted in 1988. The focus of the 1988 cruises (F-8-88-AA) was a survey of the Aleutian Arc. The eastern most portion of that survey extended outside of the Aleutian Arc survey area and covered an area of approximately 52,000 sq km of seafloor on the western edge of the Gulf of Alaska. The final two cruises (F-6-89-GA, F-7-89-EG) were completed in 1989 (Carlson and others, 1990; Bruns and others, 1992).

Figure 29. Map showing field activities for GLORIA sidescan-sonar data collection in the U.S. Exclusive Economic Zone (EEZ) Gulf of Alaska area.