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GAK_250M_LCC_WGS84.TIF - Gulf of Alaska U.S. EEZ GLORIA sidescan-sonar composite mosaic (LCC, 250 m, WGS84)

Published by U.S. Geological Survey | Department of the Interior | Metadata Last Checked: July 16, 2025 | Last Modified: 20211111
The Gulf of Alaska U.S. EEZ GLORIA digital sidescan-sonar mosaic covers about 806,000 square kilometers (sq km) of sea-floor. The mosaic shows the sea-floor morphology from Uminak Pass to Dixon Entrance, from the shelf break seaward to about 400 km. An additional 70-km-wide swath was imaged along the British Columbia margin to follow the trace of the Queen Charlotte Fault south of the Dixon Entrance. Major features visible on the mosaic include continental-margin deformation structures and submarine-channel systems. As in earlier EEZ reconnaissance surveys, the USGS utilized the GLORIA (Geological LOng-Range Inclined Asdic) sidescan-sonar system to complete the geologic mapping. The collected GLORIA data were processed and digitally mosaicked to produce continuous imagery of the sea-floor. A total of 30 digital mosaics with a 50-meter pixel resolution were assembled to complete the Gulf of Alaska overview mosaic.

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250-meter ACOUSTIC RECEIVERS Abyssal/Submarine Fan Alaska Alaskan Abyssal Plain Aleutian Abyssal Plain Aleutian Trench British Columbia Margin CMGP Chirikof Channel Coastal and Marine Geology Program Continental/Island Rise Continental/Island Slope EEZ Exclusive Economic Zone Exclusive Economic Zone (EEZ) GLORIA GLORIA > Geological Long-Range Inclined ASDIC GeoTIFF image Geological LOng-Range Inclined Asdic Gulf of Alaska Gulf of Alaska Ecoregion Infobank identifier F-1-86-GA Infobank identifier F-6-89-GA Infobank identifier F-7-89-EG Infobank identifier F-8-88-AA Infobank identifier F-9-88-WG Kodiak-Bowie seamount chain Lambert Conformal Conic Marine Basin Floor Marine Oceanic North American Pacific Fijordland Ecoregion Ocean > Pacific Ocean Ocean > Pacific Ocean > North Pacific Ocean Ocean > Pacific Ocean > North Pacific Ocean > Gulf Of Alaska Oceans > Ocean Acoustics > Acoustic Reflectivity Queen Charlotte Fault SIDE-SCAN SONAR Surveyor Channel Tectonic Trench U.S. Geological Survey USGS USGS:881c8b04-be32-4ce8-aacd-63967d0e04c5 WCMG Western Coastal and Marine Geology Yakutat Margin acoustic reflectivity backscatter composite mosaic distributions geoscientificInformation grey scale image image mosaics imageryBaseMapsEarthCover marine geology marine geophysics oceans physical habitats and geomorphology sea-floor acoustic reflectivity sea-floor characteristics seabed sidescan sonar sidescan-sonar mosaic

Complete Metadata

@id http://datainventory.doi.gov/id/dataset/e03d09bf10b7eea3bcf7339636deffce
bureauCode 
[
  "010:12"
]
identifier USGS:881c8b04-be32-4ce8-aacd-63967d0e04c5
spatial -166.307494,50.013922,-125.485934,60.006665
theme 
[
  "geospatial"
]

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