Our Services

Geophysical Methods

Dependable, on-time studies, planning, consulting and project management from the geophysics experts

GEL Solutions employs a number of sophisticated methods to help you solve your toughest geophysical challenges:

Ground Penetrating Radar (GPR)

GPR is an electromagnetic method that detects interfaces between materials with differing electrical properties. The instrument produces a continuous cross-section of subsurface reflections that can be viewed by the operator in real time or downloaded to a laptop and post-processed for more thorough analysis. GPR is able to detect both metallic and non-metallic objects.

  • Subsurface Utility Designation and Mapping
  • Underground Storage Tanks (UST) and Buried Drums
  • Archaeology/Cemetery
  • Geologic Profiling
  • Delineating Landfills and Buried Debris
  • Concrete Rebar Mapping
  • Forensics
  • Voids
  • Foundations
Electromagnetic Methods

Electromagnetic (EM) instruments utilize electromagnetic transmitters and receivers for the detection of subsurface metal and lateral and vertical variations in electrical conductivity. The EM instruments can detect both ferrous and non-ferrous metals. Some models, such as the EM61-MK2 by Geonics is relatively insensitive to interference from nearby surface metal such as fences, buildings, cars, etc., yet it detects a single 55-gallon drum at a depth of over 10 feet beneath the instrument.

With electromagnetic methods, data can be viewed by the operator for on-the-fly detection, or downloaded to a laptop for processing analysis, and mapping. The instruments transmit and receive signals by means of induction and do not require direct ground contact.

  • Locating Underground Storage Tanks (UST) and Buried Drums
  • Unexploded Ordnance (UXO) Mapping
  • Underground Utility Mapping
  • Locating Buried Debris, Landfills and Contaminants
  • Mineral Exploration
  • Groundwater exploration
Seismic Methods

Seismic methods involve the generation and recording of sound waves for detecting subsurface interfaces and measuring seismic velocity variations with depth, using geophones and a seismograph. The GEL team can make preliminary interpretations in the field then download data to a laptop for further processing and analysis.

  • Determining depth to and ripability of bedrock
  • Mapping fracture zones and karstic limestone
  • Locating and detecting buried foundations
  • Soil classification studies
  • Vibration monitoring
Resistivity Methods

We make resistivity measurements by introducing an electrical current into the earth between a pair of electrodes and measuring the potential electric current between a second pair of electrodes. A linear electrode array produces a 2D cross-section of the subsurface environment.

  • Delineating the depth, thickness, and lateral extent of geologic strata (sands and gravels associated with paleo-stream channels)
  • Locating geologic and structural anomalies
  • Mapping contaminant plumes
  • Locating and delineating landfills
  • Mapping subsurface voids and sinkholes
Magnetic Methods

Magnetometers measure the intensity of the earth's magnetic field regardless of direction (total field magnetometers), or the intensity in a certain direction (fluxgate magnetometers). Thanks to superior data collection speed and sensitivity, total field magnetometers are more commonly used for environmental applications. Only ferrous objects will cause fluctuations in the earth magnetic field and can therefore be detected with magnetometers.

Using two sensors, GEL teams can record the sensor readings and the magnetic gradient at the measurement location for increased sensitivity and data quality. We store and display the data on a digital data logger, and download the data to a laptop for thorough analysis and interpretation.


Our for magnetic methods includes:

  • Unexploded ordnance (UXO) mapping
  • Locating underground storage tanks (UST) and buried metal drums
  • Locating buried debris and landfills
  • Archaeological excavation to locate artifacts on construction sites and archaeological dig sites
  • Mineral exploration
  • Groundwater exploration
Borehole Logging Methods

Geophysical borehole logging can provide accurate data of the physical properties of geologic units within the borehole environment. Borehole logging is a time and money-saving approach to gathering detailed information, which is otherwise only obtainable from performing and analyzing numerous cores. Logging data is typically used to characterize geology, fracture patterns, fluid flow, and geologic structural properties. In other words, it answers questions.

The GEL Solutions team employs common borehole logging techniques such as resistivity, natural gamma, electromagnetic induction, three-arm caliper, spontaneous potential, deviation, fluid resistivity, and temperature so we can deploy our testing equipment and interpret the data quickly and cost effectively. These techniques maximize the information we can gather from geotechnical borings.

A variety of other tools such as heat pulse flow meter, optical and acoustic televiewers, downhole seismics and ground penetrating radar (GPR) are at our disposal for a more detailed subsurface analysis.

  • Geologic strata mapping
  • Soil layer identification
  • Fracture location mapping
  • Void mapping
  • Calculated porosity measurements
  • Fracture size and orientation data
  • Layer property determinations
  • Borehole fluid properties
  • Fracture fluid flow data
Non-Destructive Testing

We commonly conduct non-destructive testing and evaluation of concrete structures for a variety of clients. We use techniques to investigate the location of reinforcement, concrete quality, and the thickness of concrete members without coring.

To investigate your structure, GEL Solutions utilizes GPR antennas ranging from 500 MHz - 2.3 GHz, as well as lower frequency antennas, coupled with various seismic and electrical methods.

  • Plan view maps of conduits, pre-stressed cables, voids, and rebar mesh placement
  • Detecting common issues with concrete structures such as reinforcement corrosion and associated deterioration before the problem becomes visible on the surface
Unexploded Ordnance

The importance of safely and accurately locating unexploded ordnance speaks for itself. GEL Solutions provides data that is dependable, defensible, and cost-effective. We use the latest UXO technology accepted by the U.S. Army Corps of Engineers, and we comply with the rapidly changing federal requirements.

We can design a survey that takes into consideration terrain, type and size of ordnance, and depth of clearance, and apply the appropriate methods such as electromagnetics and magnetics. GEL Solutions has provided digital geophysical mapping (DGM) services for private and government entities throughout the country.

  • Digital Geophysical Mapping
  • Data Processing and Interpretation
  • Military Munitions Site Management
UXO Equipment
  • Geometrics G-858 Magnetometers (single channel and arrays)
  • Geonics EM-61 (single channel and arrays)
  • Trimble Robotic Geodimeter
  • Trimble RTK GPS
  • Onboard Navigation System
  • Scintrex Smartmag SM-4 Magnetometer
  • Schondstedt Magnetic Locator

Contact us to discuss your needs.