Sonar mapping of the sea floor provides CMG researchers with very useful data. Some sonar systems map the topography of the sea floor by recording large swaths of depth measurements. Others collect information useful in determining the geologic makeup of the sea floor and the sub-surface structure.
Description: Geological Survey studies the geologic processes at work in the Great Lakes region because they have direct bearing on the use, management, development, and preservation of the shoreline. It is important to understand how these processes shape our daily lives. About 15 percent of the United States' and 50 percent of Canada's population live along or near the 9,000-kilometer-long coastline of the Great Lakes. About 83 percent of the shoreline is privately-owned with property values as high as $10,000 per linear foot of lakefront. updated: 2004-03-02 pages include:
Description: Images of the sea floor off the coasts of California, Hawaii, Gulf of Mexico, and Lake Tahoe. Backscatter and swath bathymetry, regular and in 3-D! updated: 2003-10-29 pages include:
Description: This updated global inventory reports on natural gas hydrate recovered from 20 places worldwide and includes 79 places where the presence of gas hydrate has been inferred from geophysical, geochemical, or geological evidence. updated: 2001-01-09 pages include:
Description: Initiative to map lake bathymetry and classify lakebed materials to advance knowledge of Great Lakes and enable better management of Great Lakes resources. updated: 2000-12-12 pages include:
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U. S. Department of the Interior | U.S. Geological Survey
