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Precise measurements of the gravity field of the Earth can be
used to define lateral variations in density of the rocks beneath
the surface. Density, in turn, often can be related directly
to rock type or broad classes of rocks. Gravity techniques are
very effective in defining the three-dimensional geometry of
sedimentary basins and young volcanic-tectonic depressions, in
delineating active or recently active faults, and in identifying
the structure of major fault zones. They also have been applied
successfully to problems in geothermal, mineral, and hydrocarbon
exploration, in ground water modeling, in waste contamination
studies, in crustal structure and plate tectonic investigations,
and in the monitoring of deformation and subsurface mass movement
associated with volcanic activity, earthquakes, and ground water
extraction.
Bibliographies and location maps of selected publications containing
gravity data have been compiled for most states. Draft copies
of individual states can be obtained for internal use only.
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