GLORIA bathymetry of the U.S. West Coast Exclusive Economic Zone

Sep 8, 2020 (Last modified Aug 25, 2022)
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Description:
The GLORIA image of the Exclusive Economic Zone (EEZ) off California, Oregon, and Washington covers about 830,000 square kilometers (sq km) of sea floor. Many geologic features visible on the imagery are representative of a tectonically active continental margin: volcanic ridges and seamounts, faults, crustal lineaments, channels, levees, slump scars, large sediment bedforms, and varying sediment types. The geologic processes active along this margin differ north and south of about latitude 40 N due to a major change in the nature of the ocean-continent plate boundary. North of latitude 40 N, the North American Plate boundary is a subduction zone; south of 40 N the plate boundary is transform.

In March 1983, President Ronald Reagan signed a proclamation establishing an Exclusive Economic Zone (EEZ) of the United States extending its territory 200 nautical miles from the coasts of the United States, Puerto Rico, the Northern Mariana Islands, and the U.S. territories and possessions. In 1984, the U.S. Geological Survey (USGS), Office of Marine Geology began a program to map these areas of the EEZ. The U.S. Pacific Coast was the first EEZ region to be mapped and launched the GLORIA (Geological LOng-Range Inclined Asdic) mapping program. The area covered by this survey extended from the Mexican to the Canadian borders and from the continental shelf edge, at about the 400-meter bathymetric contour, to 200 nautical miles from the coast. Survey of the U.S. Pacific West Coast EEZ was completed in four consecutive cruises conducted from late April through mid-August 1984. The collected GLORIA data were processed and digitally mosaicked to produce continuous imagery of the sea-floor. A total of 36 digital mosaics of an approximate 2 degree by 2 degree (or smaller) area with a 50-meter pixel resolution were completed for the region.

Data Provided By:
U.S. Geological Survey
Content date:
1984
Citation:
U.S. Geological Survey, 2011, COW_250M_TM_NAD27.TIF - U.S. Pacific West Coast EEZ GLORIA sidescan-sonar composite mosaic (TM, 250 m, NAD27): Open-File Report 2010-1332, U.S. Geological Survey, Coastal and Marine Geology Program, Pacific Coastal and Marine Science Center, Menlo Park, CA.

This is part of the following larger work:

Paskevich, Valerie F. , Wong, Florence L. , O'Malley, John J. , Stevenson, Andrew J. , and Gutmacher, Christina E. , 2011, GLORIA Sidescan-Sonar Imagery for Parts of the U.S. Exclusive Economic Zone and Adjacent Areas: Open-File Report 2010-1332, U.S. Geological Survey, Coastal and Marine Geology Program, Pacific Coastal and Marine Science Center, Menlo Park, CA.
Spatial Resolution:
0.00224815 (Degree)
Contact Organization:
U.S. Geological Survey
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Use Constraints:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.
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Tags:
mendocino fracture zone, delgada fan, santa monica trough, geological long-range inclined asdic, gorda ridge, juan de fuca ridge, coastal and marine geology program, delgado fan, infobank identifier f-1-84-sc, baja seamount province, monterey canyon, san diego trough, coos bay, san lucia escarpment, taney seamounts, juan de fuca plate, u.s. pacific west coast, gorda basin, escanaba trough, cascadia channel, infobank identifier f-2-84-nc, monterey fan, infobank identifier f-4-84-wo, point arena, nitinat fan, california, washington, oregon, cmgp, mendocino canyon, arguello canyon, bathymetry, farallon fan, gloria, arguello fan, gorda plate, backscatter, mendocino channel, point conception, marine geology, eez, sidescan-sonar mosaic, infobank identifier f-3-84-nc, western coastal and marine geology, pacific plate, blanco fracture zone, acoustic reflectivity, murray fracture zone, gorda escarpment, geotiff image, san pedro trough, wcmg, grey scale image, exclusive economic zone, usgs
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