Geophysical Monitoring Articles

  • Using a Ground Penetrating Radar (Important terms)

    Air Low dielectric (~1), high velocity material i.e. EM waves travel almost at the speed of light. In air the emission pattern of GPR antennas is broader than in the ground. It is recommended to place the GPR as close to the ground as possible to direct emission energy further into a material. Some applications of GPR include emission exclusively in air.Ground / ...


    By Oerad Tech Ltd

  • Performing Bridge Deck Inspections with Ground Penetrating Radar

    Maintenance of the nation’s infrastructure is a growing concern. No one wants to be delayed by road closures due to emergency repair. Unfortunately, often the organizations responsible for repairing and maintaining our roads are unaware of areas in the roads that need repair until the road is so damaged that it requires emergency repair. In the case of sensitive road areas like ...


    By Encompass Inspections LLC

  • Meltwater flow through a rapidly deglaciating glacier and foreland catchment system: Virkisjökull, SE Iceland

    Virkisjökull is a rapidly retreating glacier in south-east Iceland. A proglacial lake has formed in the last ten years underlain by buried ice. In this study we estimate water velocities through the glacier, proglacial foreland and proglacial river using tracer tests and continuous meltwater flow measurements. Tracer testing from a glacial moulin to the glacier outlet in September 2013 ...


    By IWA Publishing

  • UXO discrimination using time domain electromagnetic induction

    Introduction An explosive ordnance is a munition that is either launched or fired with the intent of detonation at a specified target. An unexploded ordnance (UXO) is an explosive ordnance that, due to some malfunction, remains undetonated. As a result, the ordnance can be found at the ground surface, partially buried, or buried at a depth of up to 8 m beneath the surface. Practical and ...


    By Geonics Limited

  • Using Electromagnetic induction to characterize soils - Case Study

    Electrical conductivity measurements have been used for years to determine salinity and moisture in soils. Probes were inserted directly into the soil to determine how well the soil conducted an applied current. This process was slow and labor-intensive and was usually reserved for scientific studies. A more recent technique for measuring conductivity is electromagnetic induction (EM), a ...


    By Geonics Limited

  • Methods used to carry out six roadway investigations of sinkholes

    Abstract Karst conditions are a prevalent problem impacting many roads, bridges and highways of the United States. Six case-histories present an overview of investigations made to determine the presence of karst (sinkholes and cavities) and their possible impact on existing or new construction. These six case-histories represent projects which range from reconnaissance investigations to ...


    By Geonics Limited

  • 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

  • Geo Drilling International: Hands-On

    Boart Longyear has launched a core-orientation system made for drillers, by drillers Although critical for mapping exploration and minesite development, core orientation is part of the drilling process that has experienced only incremental product improvements through small changes to the process and equipment. Boart Longyear has now introduced TruCore, a first-inindustry integrated ...


    By Boart Longyear Inc.

  • 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 ...

  • General Mapping Case Study

    This is a collection of various cases where the 2D resistivity imaging method pioneered by Advanced Geosciences Inc have been successfully applied. Click on a section below and you will be shown a full 2D resistivity imaging brochure detailing the case in question. Acknowledgement: These cases have been submitted by satisfied customers whom we thank for permission to publish ...


    By Advanced Geosciences, Inc.

  • Drift Step Recovery Devices Utilization for Electromagnetic Pulse Radiation

    Abstract—Utilization of drift step recovery devices for high power electromagnetic short pulse radiation is discussed here. Possibility of powerful impulse radiation is connected with decision of two problems: how to reach stable extremely powerful impulse of nanosecond and subnanosecond duration with repetition rate of dozens and hundreds of kHz; and how to bring to antenna and radiate ...


    By Transient Technologies LLC

  • Adaptive Kinetic Antenna

    Abstract - The paper describes a method of kinetic antenna development that can be adapted to environmental conditions. The kinetic antenna is a variety of integrated into impulse generator active antenna that is used for kinetic energy accumulation. Such antennas are attractive for ground penetrating radars owing to its possibility to change radiation spectrum in according with ground ...


    By Transient Technologies LLC

  • An Impulse Generator for The Ground penetrating radar

    Abstract In last time ground penetrating radars (GPR) are widely used for search and analysis of varied underground objects of natural and artificial origins. Caves and cavities can also be found and investigated with the GPR's aid. Impulse generator is the key unit, which determine GPR's parameters: depth of penetrating, accuracy et al. Serial power drift diodes are used for ...


    By Transient Technologies LLC

  • The VIY-2 Ground Penetrating Radar

    Abstract The VIY-2 ground penetrating radar (GPR) with unique sounding possibilities and use simplicity is presented at this paper. The VIY-2 GPR combines all units (synchronizer, transmitting and receiving modules, power supply and antenna system) into single case. The VIY-2 GPR communicates with computer via standard interface RS232 or USB 1.0. Utilized by the VIY-2 GPR technical solutions ...


    By Transient Technologies LLC

  • Seismic reflection, seismic crosshole and ground penetrating radar case study

    Geophysical Investigation of the Crosstown Expressway. Tampa, FL In April, 2004 Pier 97 which supported an elevated roadway in Tampa, FL was vertically displaced (collapsed) approximately 10 feet (ft). At the time of the collapse it was not known whether the collapse was associated with geological conditions at the site, specifically karst conditions, or whether is was associated with a ...


    By GeoView, Inc.

  • Structural evaluation case study

    Office Building, St.Petersburg, FL A 1,900 square foot portion of the second story of an office building was being considered for conversion from office space to bulk product storage for a nutritional supplement company. The reinforcement design and thickness of the second floor slab were required for the structural engineers to calculate the loading capacity of the floor. GeoView was ...


    By GeoView, Inc.

  • Mapping of Potential void features using ground penetrating radar case study

    Mayo Clinic - Jacksonville, Florida GeoView conducted a ground penetrating radar (GPR) study in 2009 at the Mayo Clinic in Jacksonville, Florida. The GPR study was designed to locate anomalous features potentially associated with shallow voids between a recently installed terrazzo floor and the underlying concrete. The GPR data was collected with a GSSI SIR 3000 using a 2600 Megahertz ...


    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.

  • 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 ...

  • Forensic applications including mapping and classification of tsunami sand deposits and sand dunes with ground penetrating radar

    The coastal region experiences erosional, transportational and depositional events during mega events such as tsunami. The onshore deposits are significant in determining the past events of high–energy events in the coastal region. The Optically Simulated Luminescence (OSL) dating of the sediments by combining Ground Penetrating Radar (GPR) records will reveal the past tsunami events. OSL dates ...


    By Inderscience Publishers

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