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USGS Map Catalog:  Energy and Physics

USGS maps illustrating energy and physics show such themes as the distribution of oil and gas resources, coal, geothermal resources, geomagnetism, and the Earth's gravity.  Click on any of the map titles or images below for a larger image [up to 10MB, some in PDF format, obtain Adobe Acrobat Reader at http://www.adobe.com/products/acrobat/readstep2.html].   

International

Thumbnail of South America Geology and Energy Map and link to larger GIF image

 South America Geology and Energy--This digital geologic map and geologic province map of South America was produced for the World Energy Project of the USGS. The purpose of this project is to provide a quantitative assessment of undiscovered recoverable sources of oil and gas in priority geologic provinces throughout the world. Oil and gas data were digitally allocated to the geologic provinces, and these provinces were then ranked according to known oil and gas resources to provide a prioritization for the resource assessment. Political boundaries shown on this map were taken, with permission, from the ESRI ArcWorld 1:3 million scale digital world coverage and are displayed for general reference only. Use this map to teach and learn about geology and energy in South America.  Click here for other continents and regions in this series.  

Product ID Number  Open File Report 97-470D
USA States and Regions

Thumbnail of Colorado Aeromagnetic Anomaly Map and link to larger GIF image

 Colorado Aeromagnetic Anomaly Map--Why isn't magnetism uniform across the Earth's surface?  Use this map to explain why.  Aeromagnetic anomalies are due to variations in the Earth's magnetic field caused by the uneven distribution of magnetic minerals (primarily magnetite) in the rocks that make up the upper part of the Earth's crust. The features and patterns of the aeromagnetic anomalies can be used to delineate details of subsurface geology including the locations of buried faults, magnetite-bearing rocks, and the thickness of surficial sedimentary rocks (which are generally non-magnetic). This information is valuable for mineral exploration, geologic mapping, and environmental studies.  The Colorado aeromagnetic map is constructed from grids that combine information collected in 34 separate aeromagnetic surveys conducted between 1952 and 1986. The data from these surveys are of varying quality.  Click here for listing of aeromagnetic anomaly maps in other states.

Product ID Number  Open-File-Report 00-0042

 

Thumbnail of Colorado Gravity Anomaly Map and link to larger GIF image

 Colorado Gravity Anomaly Map--Why isn't gravity constant across the Earth's surface?  Use this map to explain why.  The colors on isostatic gravity maps reflect variations in the Earth's gravity field caused primarily by lateral variations in density in the rocks that make up the upper part of the Earth's crust. An isostatic gravity grid was derived from Bouguer and free-air gravity anomaly data. This grid was created by removing from the Bouguer gravity grid a model of the gravity expression caused by deficiencies in mass (compensating mass) that supports topographic loads. The calculation of the isostatic model used averaged digital topography, a crustal thickness of 30 km, a crustal density of 2.67 g/cc, and a density contrast between the crust and upper mantle of 0.40 g/cc. The features and patterns of the maps reveal details of subsurface geology including the location of buried faults, sedimentary basins, plutons, uplifted basement rocks, and other features. Positive anomalies (red colors) delineate rocks denser than the surrounding rocks. Negative anomalies (blue colors) delineate rocks less dense than the surrounding rocks.

Product ID Number  Open-File-Report 00-0042

Thumbnail of South Dakota Aeromagnetic Anomaly Map and link to larger JPG image

 South Dakota Aeromagnetic Anomaly Map--Why isn't magnetism uniform across the Earth's surface?  Use this map to explain why.  Aeromagnetic anomalies are due to variations in the Earth's magnetic field caused by the uneven distribution of magnetic minerals (primarily magnetite) in the rocks that make up the upper part of the Earth's crust. The features and patterns of the aeromagnetic anomalies can be used to delineate details of subsurface geology including the locations of buried faults, magnetite-bearing rocks, and the thickness of surficial sedimentary rocks (which are generally non-magnetic). This information is valuable for mineral exploration, geologic mapping, and environmental studies.  The South Dakota aeromagnetic map is constructed from grids that combine information collected in 15 separate aeromagnetic surveys conducted between 1953 and 1985.  The data from these surveys are of varying quality.  Click here for listing of aeromagnetic anomaly maps in other states.

Product ID Number  Open-File-Report 02-341

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Last modified:  6 January 2004