United States Geological Survey YearbookThe Survey, 1987 - Forest reserves |
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Page 3
... changes in acoustic velocities in the subsurface and measured at dis- tances as much as 120 miles laterally from the air gun . The refraction surveys provide important information on the velocity structure of the crust and , especially ...
... changes in acoustic velocities in the subsurface and measured at dis- tances as much as 120 miles laterally from the air gun . The refraction surveys provide important information on the velocity structure of the crust and , especially ...
Page 4
... changes in the Earth's magnetic field caused by differing magnetic properties in rocks beneath the aircraft . An area is mapped as the plane flies a series of parallel traverses and the plane's location and the measured magnetic field ...
... changes in the Earth's magnetic field caused by differing magnetic properties in rocks beneath the aircraft . An area is mapped as the plane flies a series of parallel traverses and the plane's location and the measured magnetic field ...
Page 15
... changes ; a comprehensive water - use program ; investigations of the hydraulic characteristics of till ; and studies of the occurrence of natural radionuclides and pesticides in ground water . In two other studies that are funded by ...
... changes ; a comprehensive water - use program ; investigations of the hydraulic characteristics of till ; and studies of the occurrence of natural radionuclides and pesticides in ground water . In two other studies that are funded by ...
Page 21
... changes in land use relative to geologic constraints . GIS technology will help scientists analyze the relationship of topography to landslides . and other processes and develop methods to determine hydraulic and ridge - line net- works ...
... changes in land use relative to geologic constraints . GIS technology will help scientists analyze the relationship of topography to landslides . and other processes and develop methods to determine hydraulic and ridge - line net- works ...
Page 32
... changes with depth or has been affected by the presence of nearby shallow faults . Geological , hydro- logical , and geophysical measurements will continue to be made to resolve the many remaining scientific questions . The USGS will ...
... changes with depth or has been affected by the presence of nearby shallow faults . Geological , hydro- logical , and geophysical measurements will continue to be made to resolve the many remaining scientific questions . The USGS will ...
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activities Administration Alaska analysis aquifer areas Award basin Board Bureau Calcasieu River cartographic cartographic data Chief Hydrologist City City of w climate coal coastal Commission concentrations contamination cooperative Coordination County data base Denver Denver Federal Center Department of Public deposits Earth Science earthquake energy environment Environmental fiscal flow geographic information systems Geologic Division geologic map Geologist geophysical global change gram graphic ground water ground-water hazards hydrologic Hydrologist investigations Irrigation Lake Lake Nyos land located Management ment miles mineral resources National Center National Mapping Division natural Office organic Park percent Planning processes radon Regional Reston River rocks samples San Joaquin River scientific scientists sediment seismic selenium Service soils Stop streamflow studies surface tion Transportation U.S. Geological Survey United users USGS Valley Volcano Water Conservation District Water District water quality Water Resources water-quality wetlands zone