electromagnetic survey Articles

  • 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

  • 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

  • Gamma-Radiometric assessment of soil depth across a landscape not measurable using electromagnetic surveys

    Soil depth affects plant available soil water storage capacity (PAWC). This storage capacity is important for grain yield, deep drainage, and nitrate leaching in dryland environments but is difficult to measure directly on a broad scale. Measurements of ECa provide a means of estimating soil depth at spatial resolution of <50 m when sufficient contrast in conductivity exists between the ...

  • Archaeological survey 2

    The site of the Meadows’ Wesleyan Cemetery in the Adelaide is thought to contain more than 130 unmarked graves. This site initially had a chapel constructed on it in 1840 and the first burial in 1855.  The initial chapel was replaced by a more substantial stone building in 1856.  Burials continued in this cemetery sporadically until the 1940’s although the site became less ...

  • Mini PipeDiver first: Milwaukee region uses electromagnetic technology on metallic force main inspection

    Milwaukee is a water hub, and not just because of its location along the shores of Lake Michigan, which holds 4.3 percent of the world’s supply of fresh drinking water. The City also boasts of global leadership in water technology, having won a U.S. Water Prize for innovative watershed-based approaches toward water sustainability. The City takes ...


    By Pure Technologies

  • 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

  • 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.

  • Application of the AMT method case study

    Possibilities of the AMT method at searches of kimberlite pipes Last years a number of industrially important low magnetic kimberlite pipes have been discovered. That is why the role electromagnetic method increases at searching works in diamond bearing regions. The audiomagnetotelluric (AMT) sounding method has quite big depths of investigation. Tensor measurements increasing effectiveness ...

  • 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.

  • 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.

  • 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.

  • 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.

  • Fracture Zones, Aquifer Testing, and Scale Effects: Consideration in Fractured Bedrock Aquifers of Southwestern British Columbia

    Characterization of groundwater flow regimes in fractured bedrock aquifers on Southern Vancouver Island and the Gulf Islands of British ...


  • 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.

  • Magnetic and ground probing radar measurements for soil pollution mapping in the industrial area of Val Basento (Basilicata Region, Southern Italy): a case study

    Abstract  The joint application of electromagnetic techniques for near-surface exploration is a useful tool for soil pollution monitoring and can also contribute towards describing the spatial distribution of pollutants. The results of a geophysical field survey that was carried out for characterizing the heavy metal and waste disposal soil pollution phenomena in the industrial area of Val ...


  • Utilizing a Multiple Metal Detector Array for Locating Anomalies Indicative of Ferrous and Non-Ferrous OE/UXO

    ABSTRACT An array of three Geonics Limited EM61-MK2 metal detectors was utilized to identify subsurface metallic anomalies at the Mare Island Naval Shipyard in Vallejo, California. The goal of the 120-acre survey was to locate anomalies indicative of ferrous and nonferrous ordnance and explosives/unexploded ordnance (OE/UXO) in dredge pond berms with particular attention to 20 mm high explosive ...


    By Weston Solutions, Inc

  • Radiation Monitors and Meters

    Light Description and Applications The light meter is a portable unit designed to measure visible, UV, and near-UV light in the workplace. (The CTC has a UV light meter available through its loan program, ALEP.) The light meter is capable of reading any optical unit of energy or power level if the appropriate detector has been calibrated with the meter. The spectral range of the instrument is ...

  • Case Study - Construction Aggregate: Sand

    Geologic Mapping of Sand Unit Thickness Pyramid was contracted to perform an electrical resistivity survey across 230 acres of undeveloped land in North Carolina. The purpose of the survey was to quantify the lateral extents and approximate depth/thicknesses of sandy soils near the ground surface. The client was interested in the potential of the site to be utilized as a sand mine, and ...


    By Advanced Geosciences, Inc.

  • 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.

  • Noise Mapping in Lille

    Lille, with a population of 1091 million inhabitants is the 4th largest agglomeration in France after Paris, Lyon, and Marseille. Situated at the heart of a network of 464 km motorways connecting six European cities (Brussels, Bonn, the Hague, London, Luxembourg and Paris), the metropolis of Lille also has the densest railway network of France after Paris. Pascal Thomas and his team of 8 ...

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