geophysical em Articles

  • Integrated Geophysics: Combining methods to obtain a better perspective

    The combined information from different geophysical surveying methods often allows ECA's geophysicists to provide interpretations with much greater confidence. Magnetics with Electromagnetic Induction (EMI) GPR with Magnetics and/or EMI GPR with Metal Detection (EMI or EM-61) Seismic with EMI ...


    By ECA Geophysics

  • Integrated Geophysics: GPR and metal detection surveys at a retail facility

    PROJECT: GPR and EMI surveys at an active Safeway grocery store parking lot LOCATION: Rapid City, South Dakota PROJECT DESCRIPTION: Designed and performed a GPR survey in tandem with an EM-61 metal detection survey of a parking lot for a Safeway store in Rapid City, South Dakota. Surveys were designed to detect buried metallic and non-metallic drums and ...


    By ECA Geophysics

  • Integrated Geophysics: GPR and EMI surveys at an air force base

    PROJECT: GPR and EMI surveys at closed metallic waste disposal sites LOCATION: Hill Air Force Base Annex near Ogden, Utah PROJECT DESCRIPTION: Designed and performed a GPR survey in tandem with an EM-31 terrain conductivity survey regarding two suspected Mg/Th aeronautical debris dump sites at an Air Force base in Utah.  Survey was designed to ...


    By ECA Geophysics

  • Integrated Geophysics: Magnetic / EMI surveys at an air force base

    PROJECT: EMI and Magnetic surveys at closed waste disposal sites LOCATION: Holloman Air Force Base near Alamogordo, New Mexico PROJECT DESCRIPTION: Designed and performed total-field magnetometer surveys in tandem with EM-31 terrain conductivity (EMI) surveys of approximately 53 acres of closed landfills at an Air Force base in New Mexico.  Survey ...


    By ECA Geophysics

  • Integrated Geophysics: GPR and EMI surveys at an air force site in the Mojave desert

    PROJECT: GPR and EMI surveys at closed waste disposal sites LOCATION: Cuddeback Air-to-Ground Gunnery Range in the Mojave Desert near Ridgecrest, California PROJECT DESCRIPTION: Designed and performed a GPR survey in tandem with an EM-31 terrain conductivity survey of nine closed landfilling areas at an abandoned Air Force gunnery range located in the ...


    By ECA Geophysics

  • Integrated Geophysics: Magnetic and EMI surveys at a solid waste landfill

    PROJECT: Magnetic and EMI surveys at a closed municipal solid waste landfill site LOCATION: Pasco, Washington PROJECT DESCRIPTION: Designed and performed a total-field magnetometer survey in tandem with an EM-31 terrain conductivity survey of a closed municipal solid waste landfill located east of Pasco, Washington.  Survey was designed to detect ...


    By ECA Geophysics

  • Unexploded ordinance case study

    Jacksonville, Florida A geophysical investigation was conducted at a World War II era bombing range in the eastern United States. The site was approximately 2,000 feet by 300 feet in plan dimension. Historical information indicated that MK23 practice bombs, 2.75” rockets, and 100 pound practice bombs were used at the site. The purpose of the geophysical investigation was to ...


    By GeoView, Inc.

  • Underground storage tanks case study

    MacDill Air Force Base A Phase II environmental site assessment was conducted at a military base in the southeastern United States. As part of the ESA, GeoView was contracted to perform the geophysical site assessment. The purpose of the geophysical investigation was to determine the presence and location of any underground storage tanks that may be buried within the boundaries of the ...


    By GeoView, Inc.

  • Mine remediation case study

    Bartow, Florida GeoView, Inc. performed a geophysical investigation across a 200 acre site in Polk County, Florida. It had been reported that clay slimes from former mining operations had been deposited on the site. The purpose of the investigation was to help determine the horizontal and vertical extent of the clay slimes. Due to the large size of the site and limited budget, the ...


    By GeoView, Inc.

  • Buried debris case study

    Saufley Field, Escambia County, Florida GeoView was tasked with performing a geophysical investigation at a military base in the southeastern United States. The purpose of the investigation was to locate a reported debris burial pit. The burial pit was reported to be 60 feet (ft) in length and up to 10 ft deep. Historical records indicated that the pit  contained buried drums and ...


    By GeoView, Inc.

  • Keynote presenter previews NGWA Conference on Hydrogeophysics and Deep Groundwater

    Andrea Croskrey, PG, of the Texas Water Development Board will give the keynote presentation at the NGWA Conference on Hydrogeophysics and Deep Groundwater, March 20-21 in Denver, Colorado. Focusing on the use of geophysics—from remote sensing to borehole applications—for groundwater studies, the conference also ...

  • Pre-Colombian artifacts case study

    Cordillera de Mérida mountain range, Northeastern Colombia A pipeline is planned to transport oil from the Cordillera de Mérida mountain range of northeastern Colombia west towards the Pacific Ocean. An archeological investigation is being conducted by others along the proposed pipeline route to determine potential areas of historical significance. As part of ...


    By GeoView, Inc.

  • Electromagnetic (EMI) surveys

    EMI (EM-34) surveyDesigned and performed an EM-34 soil conductivity (soil mapping) survey of a 26-acre wood-waste landfill in Omak, Washington.  This soil mapping survey was designed to detect buried drums at a depth of 60 feet and was augmented by a total-field magnetometer survey. While employed with the Arkansas Department of Environmental Quality (ADEQ), performed approximately 40 ...


    By ECA Geophysics

  • Locate buried monitoring wells case study

    A Phase II Environmental Site Investigation was being conducted at a gasoline station in Fort Myers, Florida. In order to minimize costs, our client intended to use several existing on-site monitoring wells rather than installing new wells. However, five of the existing wells had been covered with asphalt and were no longer visible. GeoView was tasked with performing a shallow geophysical study ...


    By GeoView, Inc.

  • Geological characterization case study

    Oil Storage Terminal Grand Bahama Island, Bahamas GeoView, Inc. performed a geophysical investigation across a 65-acre area where large bulk oil storage tanks were planned for construction. The purpose of the investigation was to evaluate the condition of the underlying limestone, which from previous work was known to be suspect in certain areas. Of primary ...


    By GeoView, Inc.

  • Methods for Removing Signal Noise from Helicopter Electromagnetic Survey Data

    A geophysical analysis was conducted over the abandoned T&T subsurface mines and portions of the Muddy and Roaring Creek watersheds in northeastern Preston County, West Virginia. The data were collected using helicopter-borne measurements of frequency-domain electromagnetic (FDEM) conductivity (390, 1555, 6254, 25,800, and 102,680 Hz). Noise was a significant issue in the lowest frequency EM ...


    By Springer

  • Results of AMT survey at Patomsky crater case study

    The Patomsky crater is located in east part of the Irkutsk region (Russia). This geological object has anomaly appearance and is discordant placed relative to hosting geological structure. The crater has been discovered in 1949 during routine geological survey of the territory by geologist V.V. Kolpakov. The drastic investigations of Patomsky crater by modern technology have begun since 2006. The ...

  • Human factor speeds up glacial melting

    The impact of human activity is melting the glaciers in the world’s mountain regions, and is doing so at an accelerating rate. Ben Marzeion, a climate scientist at the University of Innsbruck’s Institute of Meteorology and Geophysics, Austria, reports with colleagues in the journal ...


    By Climate News Network

  • Use of Electromagnetic Induction Tools in salinity assessment/appraisals in eastern Colorado

    Abstract Electromagnetic induction (EMI) is a relatively low-cost and rapid method for measuring, assessing spatially soil salinity. The two studies were conducted to evaluate data obtained with a single-frequency (EM38 meter) and multi-frequency (GEM300 sensor) EMI instruments and to relate apparent conductivity measured by these instruments with the more conventional conductivity of the ...


    By Geonics Limited

  • Monitoring Gas Emissions from Volcanoes to Predict Volcanic Activity

    To understand and predict the behaviour of volcanoes an increasing number of scientists are combining geological monitoring and geochemical models. By measuring and monitoring the prevalence of gases like CO2, scientists hope to be able to better predict the likelihood of volcanic eruptions. In 2010 Iceland’s Eyjafjallajökull volcano erupted, releasing 250 million ...


    By Edinburgh Instruments Ltd

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