Resistivity

Electrical resistance of materials, often measured in boreholes.
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Airborne electromagnetic and magnetic survey data and inverted resistivity models, Cedar Rapids, Iowa, May 2017

Airborne electromagnetic and magnetic survey data were collected in 2017 along 347 line kilometers. Includes processed AEM and magnetic data and inverted resistivity depth sections. Data are provided in CSV format.

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Airborne electromagnetic and magnetic survey data and inverted resistivity models, western Yukon Flats, Alaska, February 2016

Airborne electromagnetic and magnetic survey data were collected during 2016 along 300 line kilometers in this area, flown at a nominal flight height of 30 m above terrain along widely spaced reconnaissance lines. Includes raw and processed AEM data, laterally-constrained inverted resistivity depth sections along all flight lines, and unprocessed and processed magnetic data. Data are provided in CSV format.

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Characterization of major lithologic units underlying the lower American River using water-borne continuous resistivity profiling, Sacramento, California, June 2008

Geophysical study of the sediment under a river intended to help assess the susceptibility of this material to scour and the erosion of levees adjacent to the river.

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Geophysical investigation of Red Devil mine using direct-current resistivity and electromagnetic induction, Red Devil, Alaska, August 2010

This large producer of mercury operated from 1933 to 1971. As part of remediation work, this survey used electromagnetic methods to study subsurface resistivity.

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Ground-based time-domain electromagnetic data and resistivity models near Manistee National Forest, Michigan, 2020

Ground-based transient electromagnetic data were acquired near Manistee National Forest, Michigan, to define the resistivity structure of the subsurface rocks.

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Results of electrical resistivity data collected near the town of Guernsey, Platte county, Wyoming

A study to investigate subsurface geologic conditions as they relate to ground-water flow in an abandoned landfill.

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Schlumberger DC resistivity soundings in the Boulder watershed, Jefferson and Lewis and Clark counties, Montana

DC resistivity soundings were made to map subsurface lithologic, structural and hydrologic features important in controlling possible ground water contamination from mining activities and for design of remediation efforts.

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Aerial magnetic, electromagnetic, and gamma-ray survey, Berrien county, Michigan

Maps, grids, and flight-line databases of a detailed aerial survey and maps and grids of satellite data

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Airborne electromagnetic and magnetic geophysical survey data of the Yukon Flats and Fort Wainwright areas, central Alaska, June 2010

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.

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Airborne electromagnetic and magnetic survey data from the western Hualapai Indian Reservation near Grand Canyon West and Peach Springs, Arizona, 2018

Airborne electromagnetic (AEM) and magnetic survey data along 1,637 line-km at a nominal flight height of 30m above terrain (averaging 53m), with nominal line spacing 1 km or 4 km. Data provided are minimally processed AEM and magnetic measurements, fully processed AEM data were used to develop an included resistivity model.

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Airborne electromagnetic and magnetic survey data in Big Cypress National Preserve and Everglades National Park, 2001

Airborne electromagnetic (AEM) and magnetic survey data, a total of 3065 line-kilometers, collected during October 2001 with line spacing 400m and nominal altitude of 30m. Includes raw and processed AEM data and magnetic data, in CSV format.

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Airborne electromagnetic and magnetic survey data of the San Juan-Silverton Caldera complex, Silverton, Colorado, 2019

Airborne electromagnetic and magnetic survey data were collected during 2019 along 1,467 line-kilometers in this area. The survey was flown at a mean flight height of 140 meters (m) above terrain and line spacings ranging from 150 m to 600 m. Data are provided in CSV and shapefile formats.

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Airborne electromagnetic and magnetic survey data, Big Sioux aquifer, October 2015, Sioux Falls, South Dakota

Airborne electromagnetic (AEM) and magnetic survey data collected in 2015 along 769 line-kilometers including raw and processed AEM and magnetic data, processed AEM resistivity-depth inversions. Data are provided in CSV format.

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Airborne electromagnetic and magnetic survey data, East Poplar Oil Field and surrounding area, October 2014, Fort Peck Indian Reservation, Montana

Airborne electromagnetic and magnetic survey data were collected in 2014 in this area. The survey was flown at a nominal flight height of 30 m above terrain, line spacing of 200 m with a smaller area at 100 m. Includes raw and processed AEM data and spatially-constrained inverted resistivity depth sections, and unprocessed and processed magnetic data that has been drift corrected, leveled, and draped to terrain. Data are provided in CSV format.

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Airborne electromagnetic and magnetic survey data, Iliamna Volcano, Alaska, June 2012

Airborne electromagnetic and magnetic survey data in 2012 along 556 line-kilometers over this volcano flown at a nominal flight height of 30 meters (m) above terrain with a nominal spacing of 250 m. Data are provided in CSV and GeoTiff formats.

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Airborne electromagnetic and magnetic survey data, northeast Wisconsin

Airborne electromagnetic and magnetic survey data collected during 2021 over 3,170 line kilometers with nominal flight height of 30 - 40 m above terrain and nominal line spacing of 0.5 miles. Data are provided in Geosoft database, Geosoft grid, GeoTiff, Geosoft map, and netCDF formats.

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Airborne electromagnetic and magnetic survey data, southeastern San Joaquin Valley near Cawelo, California, 2016

Airborne electromagnetic (AEM) and magnetic survey data to support groundwater salinity mapping and hydrogeologic framework development. Data are provided in CSV format.

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Airborne electromagnetic and magnetic survey data, Stillwater Complex, Montana, May 2000 (ver. 2.0, June 2020)

Data from a helicopter-borne electromagnetic and magnetic survey flown over this area area in 2000. Nominal elevation of the sensor was 60 meters. Survey coverage comprises 1,914 line kilometers. Data are provided in CSV format.

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Airborne electromagnetic and magnetic survey, southwestern San Joaquin Valley near Lost Hills, California, 2016

Airborne electromagnetic (AEM) and magnetic survey data in this area to aid groundwater studies. Includes inverted resistivity model. Data are provided in CSV, plotted sections provided in PDF.

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Airborne Electromagnetic and Magnetic Survey, Yellowstone National Park, 2016 - Minimally Processed Data

Airborne electromagnetic and magnetic survey data were collected during 2016 along 4,212 line-kilometers over this area. The survey was flown with a nominal line spacing of 450 meters or less, and mean flight height about 48 m providing depth of investigation about 500m. Data are provided in CSV format, flight lines in shapefile format.

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Airborne electromagnetic data and processing within Leach Lake Basin, Fort Irwin, California

Releases airborne survey data, resistivity cross-sections and depth slices derived from data inversion. Resulting resistivity models confirm geologic framework, constrain hydrostratigraphy and depth to basement, and reveal fault and fold distribution.

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Airborne Electromagnetic Survey Processed Data and Models Data Release, Yellowstone National Park, Wyoming, 2016

Airborne electromagnetic (AEM) and magnetic survey data were collected in 2016 along 4,212 line-kilometers over this area as part of a study of the subsurface geologic structure and geothermal and groundwater resources of Yellowstone National Park. Data are provided in CSV format.

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Airborne electromagnetic, magnetic, and radiometric survey of the Mississippi Alluvial Plain, November 2018 - February 2019

Airborne electromagnetic, magnetic, and radiometric data were acquired in 2018-2019 along 16,816 line-kilometers flown at a nominal sensor flight height of 30 m above terrain with 6- to 12-kilometer spaced east-west flight lines to understand subsurface geologic structure and inform hydrologic models. Data are provided in CSV and GXF grid formats. Flight lines are provided in shapefile format.

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Airborne electromagnetic, magnetic, and radiometric survey of the Mississippi Alluvial Plain, November 2019 - March 2020

Airborne electromagnetic, magnetic, and radiometric data were acquired from 2019 to 2020 along 24,030 line-kilometers over the Mississippi Alluvial Plain. Survey was flown at a nominal height of 120 m above terrain with 6-kilometer spaced east-west flight lines. Data are provided in ASEG-GDF2 format.

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Airborne electromagnetic, magnetic, and radiometric survey, Shellmound, Mississippi, March 2018

Airborne electromagnetic, magnetic, and radiometric data were acquired in 2018 along 2,364 line-kilometers in this area at anominal sensor flight height of 30 m above terrain with 250 to 1,000-meter spaced flight lines. Data are provided in GXF grid, CSV, and GeoTiff formats.

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Airborne electromagnetic, magnetic, and radiometric survey, upper East River and surrounding watersheds near Crested Butte, Colorado, 2017

Airborne electromagnetic, magnetic, and radiometric data collected in 2017 over 1,984 line-kilometers in this area. Data include inverted resistivity and IP models as well. Data are provided in CSV format.

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Airborne geophysical surveys conducted in western Nebraska, 2010: contractor reports and data

Three contractor reports and data files for an airborne electromagnetic survey describing data aquisition and processing. Processed geophysical data were inverted to produce resistivity depth sections along flight lines. Results are described herein.

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An interpretation of the 1997 airborne electromagnetic (AEM) survey, Fort Huachuca vicinity, Cochise County, Arizona

Grids and flight-line magnetic and conductivity data

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Audiomagnetotelluric sounding data in the Silverton Caldera complex, Colorado, 2019

Audiomagnetotelluric station locations and data to characterize subsurface rock properties important for understanding surface water and groundwater quality issues, and also to improve knowledge of deep geologic structures that may have been conduits for hydrothermal fluids that formed mineral deposits.

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Audiomagnetotelluric survey to characterize the Sunnyside porphyry copper system in the Patagonia Mountains, Arizona

Audiomagnetotelluric (AMT) sounding data collected in 2008 in this area in support of assessments of concealed mineral resources.

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Combined results and derivative products of hydrogeologic structure and properties from airborne electromagnetic surveys in the Mississippi Alluvial Plain

Electrical resistivity results from two regional airborne electromagnetic surveys were combined to produce three-dimensional gridded models and derivative hydrogeologic products. This high-resolution information about hydrogeologic structure and properties to aid interpretations and hydrologic models. Data are provided in netCDF and GeoTiff formats.

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Constraining the location of the Archean--Proterozoic suture in the Great Basin based on magnetotelluric soundings

A regional profile on the Utah-Nevada State line reveals a deeply penetrating, broad electrical conductor suggesting the southwestern limit of intact Archean crust is farther north than previously reported with implications for future mineral exploration.

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Digitized data from ground geophysical surveys in Afghanistan

Surveys originally carried out by Soviet geophysicists from 1972 through 1974 were digitized. Georeferencing was problematic as were some of the measured characteristics; we explain what we did and how we have understood these data.

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Geology, geochemistry, and geophysics of the Fry Canyon uranium/copper project site, southeastern Utah - Indications of contaminant migration

Chemical analyses of water and sediment samples, images depicting resistivity.

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Geophysical and geochemical data from the area of the Pebble Cu-Au-Mo porphyry deposit, southwestern Alaska: Contributions to assessment techniques for concealed mineral resources

Uninterpreted geophysical measurements and geochemical and mineralogical analytical data from samples collected during the summer field seasons from 2007 to 2010. Data are available in a single Geographic Information System (GIS) database.

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Geophysical Characterization of Subsurface Properties Relevant to the Hydrology of the Standard Mine in Elk Basin, Colorado

To help understand the hydrogeologic controls in the basin and how they affect surface and groundwater interactions with nearby mine workings, electrical resistivity profile, self–potential, and magnetic measurement data are provided herein.

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Geophysical, geochemical, mineralogical, and enivronmental data for rock samples collected in a mineralized volcanic environment, upper Animas River watershed, Colorado

Data for 90 rock samples collected from 2001 to 2007 for geophysical, geochemical, mineralogical, and environmental rock properties of acid neutralizing capacity and net acid production.

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Ground conductivity measurements at selected National Wildlife Refuges, Montana and North Dakota, 2017-2018

Shallow subsurface electrical conductivity mapped at selected U.S. Fish and Wildlife Service managed lands in northeast Montana and northwest North Dakota in the winters of 2017 and 2018. Data are provided in CSV format, locations are provided in shapefile format.

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Ground geophysical study of the Buckeye Mine Tailings, Boulder watershed, Montana

Electromagnetic, resistivity, and magnetic surveys used to determine the extent of contamination in an abandoned mine area.

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Ground-based electromagnetic survey, Shellmound, Mississippi, October 2018

Shallow soil characteristics were mapped using an electromagnetic sensor in October 2018. Data were acquired by towing the sensor on a wheeled cart behind an all-terrain vehicle (ATV), with the sensor at a height of 0.432 meters (m) above the ground surface. Data are provided in CSV format.

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Helicopter Electromagnetic and Magnetic Geophysical Survey Data for Portions of the North Platte River and Lodgepole Creek, Nebraska, June 2008

The objective of the survey was to improve the understanding of the relationship between surface water and groundwater systems critical to developing management programs for water resources.

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Helicopter electromagnetic and magnetic geophysical survey data, Hunton anticline, south-central Oklahoma

Flight line data, grids, and inversions for these surveys are intended to help understand shallow groundwater and develop groundwater resource plans for the aquifer.

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Helicopter electromagnetic and magnetic geophysical survey data, Oakland, Ashland, and Firth study areas, eastern Nebraska, March 2007

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.

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Helicopter electromagnetic and magnetic geophysical survey data, portions of the North Platte and South Platte Natural Resource Districts, western Nebraska, May 2009

Geophysical surveys to map shallow hydrogeologic features of the southwestern part of the Sand Hills that contain a mix of fresh to saline lakes.

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Helicopter electromagnetic and magnetic survey data and maps, northern Bexar County, Texas

Grids, images, and flight-line paths for magnetic and resistivity surveys

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Helicopter electromagnetic and magnetic survey data and maps, Seco Creek area, Medina and Uvalde Counties, Texas

Airborne geophysical data and a summary of the hydrologic application.

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Helicopter electromagnetic data from Everglades National Park and surrounding areas, Florida, collected 9-14 December 1994

Survey to determine location of the freshwater-saltwater boundary in a coastal area.

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High resolution helicopter-borne magnetic and electromagnetic survey Eureka Graben area, Colorado September 1999

Survey parameters, data acquisition and processing procedures, and products of a 1999 airborne geophysical survey of this area. Data provided in GXF format and binary formats.

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High resolution, low altitude aeromagnetic and electromagnetic survey of Mount Rainier

Flight-line and gridded data, with description of methodology and interpretation

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Integrated investigations of environmental effects of historical mining in the Animas River watershed, San Juan county, Colorado

Major assessment of the environmental effects of historical mining in the Animas River watershed with GIS data files, tables, and plates.

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Magnetotelluric data collected to characterize aquifers in the San Luis Basin, New Mexico

The purpose of this report is to release one north-south and two east-west regional magnetotelluric sounding profiles collected where drillhole data are sparse. No interpretation of the data is included.

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Magnetotelluric data from Minnesota, Wisconsin, and Upper Michigan, 2015-2019

Magnetotelluric stations collected from 2015-2019 across parts of Minnesota, Wisconsin and the Upper Peninsula of Michigan to support regional investigations into the geologic and tectonic framework of the area and to support mineral resource investigations.

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Magnetotelluric data from Missouri, Arkansas, Tennessee, Illinois, and Kentucky, 2016-2019

Magnetotelluric station data collected from 2016-2019 across parts of Missouri, Arkansas, Tennessee, Illinois, and Kentucky to support regional investigations into the geologic and tectonic framework of the area and mineral resource and geologic hazard investigations.

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Magnetotelluric sounding data in the Silverton Caldera complex, Colorado, 2018

Magnetotelluric sounding data collected in July 2018 in the Silverton Caldera complex, Colorado, in the Southern Rocky Mountain Volcanic Field to understand the geologic structure of this area.

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Magnetotelluric sounding data, stations 1 to 22, Southern San Luis Valley, Colorado, 2006

Magnetotelluric sounding data collected in 2006 in this area to improve understanding of the hydrogeology of the Santa Fe Group and the nature of the sedimentary deposits comprising the principal groundwater aquifers of the Rio Grande rift.

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Magnetotelluric sounding data, stations 1 to 25, north eastern Nevada, 2003

Magnetotelluric sounding data collected in 2003 along a north-south profile west of Wendover, Nevada, to understand the rocks underlying mineral deposits in this area.

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Magnetotelluric sounding data, stations 1-9, Taos Plateau Volcanic Field, New Mexico, 2009

Magnetotelluric sounding data collected in 2009 in this area to improve understanding of the hydrogeology of the Santa Fe Group and the nature of the sedimentary deposits comprising the principal groundwater aquifers of the Rio Grande rift.

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Magnetotelluric sounding locations, stations 23 to 46, San Luis Valley, Colorado, 2007

Magnetotelluric sounding data collected in 2007 in this area to improve understanding of the hydrogeology of the Santa Fe Group and the nature of the sedimentary deposits comprising the principal groundwater aquifers of the Rio Grande rift.

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Mount Baker and Mount Adams Airborne Magnetic and Electromagnetic Survey Data, August 2002, Washington, USA

Flight line data for an airborne magnetic survey with nominal sensor height of 60m above terrain, flight-line data for a gravity gradiometry survey, with a report containing instrument and procedure details. Data are provided in CSV format.

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Regional scale magnetotelluric data from the Rio Grande Rift and southern Rocky Mountains

Data from 102 magnetotelluric (MT) stations collected from 2012 through 2014 in this area to improve regional conductivity models of the western United States.

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Three-dimensional geologic model of complex fault structures in the upper Seco Creek area, Medina and Uvalde counties, south-central Texas

Data sets include drill-hole from core and geophysical logs, surface geology and elevation, and helicopter electromagnetic survey data. The model may be explored and .jpg or .tiff images or using specialized software provided.

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Time-domain electromagnetic soundings near Antioch, Illinois,and Berrien Springs, Michigan

Study to help constrain 3-dimensional geologic maps of surficial materials in these glacial deposits

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Transient Electromagnetic Sounding Data Collected in the San Luis Valley, Colorado Near Great Sand Dunes National Park and Preserve, and Alamosa National Wildlife Preserve (Field Seasons 2007, 2009, and 2011)

Time-domain electromagnetic (TEM) soundings were made in this area to map the location of a blue clay unit as well as suspected faults. Data are provided in CSV and shapefile formats.

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Transient electromagnetic soundings near Great Sand Dunes National Park and Preserve, San Luis Valley, Colorado (2006 field season)

Geophysical surveying data used to infer subsurface configuration of impermeable layers in this Pliocene-Pleistocene lake bed.

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