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Map showing geochemical favorability for mesothermal base- and precious-metal veins in the Wallace 1° by 2° Quadrangle, Montana and Idaho

This map shows the geochemical favorability for mesothermal base- and precious-metal veins in the Wallace 1° by 2° quadrangle, Montana and Idaho.  The information presented here is part of the Wallace CUSMAP (Conterminous United States Mineral Assessment Program) project conducted by the U.S. Geological Survey.

Map showing late Quaternary faults and 1978-84 seismicity of the Los Angeles region, California

The Los Angeles region of California faces the greatest seismic risk of any part of the United States. The region is inhabited by more than 11 million people and is one of the Nation's key commercial and industrial centers. It lies astride a web of potentially active faults, including those segments of the San Andreas fault with the highest probability for generating a great earthquake during the

Map showing the depth to the base of the deepest ice-bearing permafrost as determined from well logs, North Slope, Alaska

Because gas hydrates from within a limited temperature range, subsurface equilibrium temperature data are necessary to calculate the depth and thickness of the gas-hydrate stability field.  Acquiring these data is difficult because drilling activity often disrupts equilibrium temperatures in the subsurface, and a well mush lie undisturbed until thermal equilibrium is reestablished (Lachenbruch and