Mineral Resources On-Line Spatial Data
Method of determining the shape and constituency of near-surface earth structures by variations of responses of the materials to electrical and magnetic fields. Use for ground-based methods of imaging.
This category is also used for magnetotelluric sounding.
- Time-domain electromagnetic soundings near Antioch, Illinois,and Berrien Springs, Michigan [New Window]
- Study to help constrain 3-dimensional geologic maps of surficial materials in these glacial deposits
- Transient electromagnetic soundings near Great Sand Dunes National Park and Preserve, San Luis Valley, Colorado (2006 field season) [New Window]
- Geophysical surveying data used to infer subsurface configuration of impermeable layers in this Pliocene-Pleistocene lake bed.
- Aerial magnetic, electromagnetic, and gamma-ray survey, Berrien county, Michigan [New Window]
- Maps, grids, and flight-line databases of a detailed aerial survey and maps and grids of satellite data
- Airborne electromagnetic and magnetic geophysical survey data of the Yukon Flats and Fort Wainwright areas, central Alaska, June 2010 [New Window]
- Study to estimate the 3-D distribution of permafrost, to evaluate the effectiveness of these methods at mapping permafrost geometry, and to better define the physical properties of the subsurface in discontinuous permafrost areas.
- Airborne electromagnetic mapping of the base of aquifer in areas of western Nebraska [New Window]
- Gridded data used to revise base of aquifer, with supporting elevation data.
- An interpretation of the 1997 airborne electromagnetic (AEM) survey, Fort Huachuca vicinity, Cochise County, Arizona [New Window]
- Grids and flight-line magnetic and conductivity data
- Geophysical investigation of Red Devil mine using direct-current resistivity and electromagnetic induction, Red Devil, Alaska, August 2010 [New Window]
- This large producer of mercury operated from 1933 to 1971. As part of remediation work, this survey used electromagnetic methods to study subsurface resistivity.
- Helicopter electromagnetic and magnetic geophysical survey data, Hunton anticline, south-central Oklahoma [New Window]
- Flight line data, grids, and inversions for these surveys are intended to help understand shallow groundwater and develop groundwater resource plans for the aquifer.
- Helicopter electromagnetic and magnetic geophysical survey data, Oakland, Ashland, and Firth study areas, eastern Nebraska, March 2007 [New Window]
- Electrical resistivity depicted in georeferenced grids and maps, representing different approximate depths of investigation for each area. The range of subsurface investigation is comparable to the depth of shallow aquifers.
- Helicopter electromagnetic and magnetic geophysical survey data, portions of the North Platte and South Platte Natural Resource Districts, western Nebraska, May 2009 [New Window]
- Geophysical surveys to map shallow hydrogeologic features of the southwestern part of the Sand Hills that contain a mix of fresh to saline lakes.