Geophysical Surveys

The office has geophysical instruments, auxiliary equipment and the respective programs that edit and interpret geophysical measurements, so as to be able to apply (depending on the target, the desired depth of survey, and the physical and technical characteristics of the research area) any combination of a series of geophysical methods.

The geophysical methods, the combination of which are used by the consultancy firm, cover a wide range of applications in geological and environmental survey and geotechnical engineering, the main of which are:

  • Survey and identification of aquifers. Water resources management (surveying subsurface flows and sources of enrichment zones). Enrichment Studies of groundwater aquifers.
  • Survey , prospection and exploration of deposits.
  • Identification and spatial assessment of mineralized zones.
  • Survey of geothermal fields.
  • Geotechnical survey - Technical Geology. Quality control of rock mass. Assessment of the characteristics and quality of the successive natural soil formations and identification of the measures of their dynamic properties for craftmanship design.
  • Design of drilling research projects.
  • Geological - tectonic - seismotectonic mapping.
  • Mapping and identification of stratigraphy, quality of rock, hydrogeological conditions and subsurface morphology .
  • Locating unexploded explosives (UXOs).
  • Mining - quarrying survey.
  • Study of soil instability, subsidence, landslides and soil creep.
  • Archaeometry research (locating subsurface and other constructions and metallic or non-metallic targets of archaeological interest).
  • Oil and mineral resources survey .
  • Quality and geochemistry identification of groundwater and surface water bodies. Establishing salination zones and possible pollution zones.
  • Detection- mapping and study of the geometrical characteristics of geological faults.
  • Survey and detection of caves, tunnels, cavities, ducts, underground reservoirs (tanks) and generally karst structures.
  • Study, survey and quality control of structures, engineering structures , foundations and reinforcement components. Precise imprinting of road layers.
  • Survey and identification of dam leaks, reservoirs, sewers and any kind of underground pipes and tanks).
  • Environmental research.
  • Construction Control and drilling control. Determination of hydrogeological characteristics and quality of groundwater.
  • Applications of military interest.
  • Assessment of suitability of waste deposition positions, sanitary landfill

Geophysical methods

Electromagnetic methods of fundoscopy: transient waves TEM and NANOTEM

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The office has the following geophysical instruments: GDP-32 receiver (6 channels), ZT 30 Transmitter (max output current 30A), NT 20 Transmitter (max output current 20A), NANOTEM receiver, XMT-32 Controller and Magnetic sensors TEM-3 (of the american company ZONGE ENGINEERING).

For the processing and interpretation of the measurements we use DATPRO software and STEMINV.

To receive measurements the Tem provisions applied are: In Loop, Moving Loop and Fix Loop.

The depth of the geophysical exploration, depending on the conductivity of the subsoil, the layout and the dimensions of the bronchi (loops), may be more than 1200m.

Electromagnetic methods of fundometry:

  • Controlled Source Audio- frequency Magneto Tellurics (CSAMT)
  • Natural source magnetotellurics (MT) and audio-frequency magnetotellurics (AMT)

The office has the following geophysical instruments: GDP-32 receiver (6 channels), ZT 30 Transmitter (max output current 30A), XMT-32 Controller andMagnetic sensors ANT-3 και ANT-4 (of the american company ZONGE ENGINEERING).

For the processing and interpretation of the measurements the software used is: DATPRO, CSAMT, EM2D and SCS2D.

The depth of the geophysical exploration, depending on the used measurement receiving frequency (0.125 to 8,000 Hz), the dimensions of the dipole (transmitter - receiver) and the conductivity of the subsurface, can be more than 1500m.

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Electromagnetic method of GPR (Ground Penetrating Radar)

gewfisikes-ereunes5The office has two Ground Penetrating Radar systems of the swedish company MALA, wihich can perform two-dimensional and three-dimensional imaging of the targets that are to be geophysically explored. These are: a) the Mala ProEx system (Professional Explorer) with its shielded antennas of 250MHz, 500MHz, 1000MHz and the RTA antenna of 25-30 MHz, and b) the system Mala GX-HDR (Ground explorer Highwith) with its shielded antennas of 160MHz and 450MHz.

For the processing and interpretation of the measurements the software used is: GEOVISION, RADEXPLORER, OBJECT MAPPER and 3D-VISION.

The depth of the geophysical exploration, depending on the antenna used and the conductivity of the subsoil ranges from 1m up to 50m.

Electromagnetic method EMI (Time Domain) gewfisikes-ereunes6

The office has two exploration systems of the company GEONICS Canada, which can perform two-dimensional and three-dimensional imaging of targets that are to be geophysically explored. The first system is the detector Geonics EM61 MK2 High Power, which is the most widely used detector for prospection UXO's and archaeometric survey. Its position is determined using the Global Positioning System RTK GPS.

The system can detect metallic or non-metallic targets at depths of up to 8m, depending on their size.

The second system is the detector Geonics EM63 which is mainly used for the categorization and orientation of the UXO's (unexploded explosives) or otherwise buried metal objects.

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Electromagnetic method SLINGRAM

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The office has two geophysical systems (EMAC 36 and HF EMAC 180) and the measurement interpretation software Slingram, of the company MALA Sweden.

The emission frequencies of the two systems are 3.6 and 18.1 kHz respectively.

Electromagnetic VLF method

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ΤThe office has the WADI geophysical instrument and the measurement interpretation software SECTOR and RAMAC, of the company ABEM Sweden.

Magnetic method

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The office has the base station, the Magnetometer – Gradiometer G856 and the measurement interpretation software MAGMAP and MAGPLOT , of the american company GEOMETRICS.

Seismic methods: reflection, refraction, Crosshole and Downhole

gewfisikes-ereunes12The office has the seismic recording equipment BISON 9048 - 48 channel seismograph and TERRALOC MARK 6 - 24 channel seismographof the swedish company ABEM. The auxiliary equipment includes the necessary cables, seismic sources and 150 horizontal / vertical geophones of different frequencies (6Hz to 14 Hz). The interpretation of the measurements is performed with the help of specialized software (WINSISM, SEISIMAGER etc.)





The seismic profiles can grow to a length of up to 480 meters.

Electrical methods: Electrical tomography, Complex resistivity and geoelectric fundoscopy of specific electrical resistance or conductivity (RES) , spontaneous potential (SP) and induced polarization (IP)

The office has the following four electrical tomography systems which can perform two-dimensional and three-dimensional imaging of the subsurface:

  • LUND Imaging system (TERRAMETER SAS 1000 (1 channel, max output current 1A & max output power 100W) plus electrode selector ES464 (4 channel & 64 electrodes)) of the swedish company ABEM.

  • LUND Imaging system (TERRAMETER SAS 4000 (4 channel, max output current 1A & max output power 100W) plus elector selector ES464 (4 channel & 64 electrodes)) of the swedish company ABEM.

  • TERRAMETER LS (4 channel, 64 electrodes max output current 2.5A & max output power 250W) of the swedish company ABEM.

  • MX-30 Multiplex Switch (30 channels, 30 electrodes max output current 5A & max output power 2500W), GDP-32 receiver (6 channels) and ZT 30 Transmitter (max output current 30A), of the american company ZONGE ENGINEERING.
The accessories include electrodes (sold or not) and 81 electrode electrical tomography wire, spaced 2m, 5m, 10m and 20m, which make it possible that the length of scans be from 160m to 1600m. For the interpretation and presentation of results the software used is the programs RES2DINV and RES3DINV, of GEOTOMO company.

For the realization of geoelectrical depth soundings (fundoscopy) of specific electrical resistance or conductivity (RES), spontaneous potential (SP), induced polarization (IP) and electrical conductivity, and depending on the desired depth of geophysical exploration the machinery used is: Terrameter Sas 1000,Terrameter Sas 4000, Terrameter LS and the system MX-30 Multiplex Switch - GDP-32 receiver - ZT 30 Transmitter. The office has the appropriate electrodes and cable of lengths up to 5km for Wenner and Sclumberger arrays. For the interpretation of the results the software used is IPI2WIN and RESIX PLUS programs.

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The depth of the geophysical survey using electrical tomography can be extended up to 400 meters.

Borehole Loggings The office has the following systems:
    • gewfisikes-ereunes16Haferland Borehole Loggings system.Maximum depth of geophysical exploration 500m. Minimum drilling diameter 80mm. Continuous recordings of the electrical resistance are performed (single focus point resistance, three or four point lateral or normal sensitivity measurements 16 inch (short) or 64 (long) of natural radiation (gamma ray) and spontaneous potential (SP) of the formations drilled, as well as of the conductivity, temperature and speed of movement of water (flow meter) of the underground aquifers.

    • gewfisikes-ereunes17System of visual vertical measurement of drilling. The maximum depth of the geophysical exploration is 500m. The minimum internal drilling diameter is 120mm (5 inchs). Continuous visual monitoring of the deviation of the drilling from the vertical axis. Field of measurements ± 4ο. Accuracy of measurement 0.1 degree.






    • gewfisikes-ereunes18Scanprobre portable image recording and drilling videotaping system. Continuous high-resolution shots at depths of up to 450m. Minimum internal diameter of drilling 60mm.





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    • gewfisikes-ereunes19Systems of the american company Hydrolab for continuous recording and monitoring (Loggings) of the quality of groundwater. They also provide the possibility of early warning in case of change in the physical and chemical characteristics of water. We have the following systems: H2O Reporter, datasonde and minisonde models 4, 4a and MS5. For the analysis and presentation of the measurements the programs used are: Hydras 3 LT and Aquachem. The maximum depth of precipitation in water is 200m. The minimum drilling diameter is 60mm. Up to 12 parameters are controlled and continuously recorded, concerning the quality of water, the main of which are: Temperature, Conductivity, Salinity, Depth, pH, ORP, Dissolved Oxygen, Turbidity, Ammonium, Nitrate, Chloride, TDG.


    • gewfisikes-ereunes20Instruments (HQ40D) of the company Hache-Lange are used to record the physicochemical characteristics of groundwater (Ph, conductivity, temperature, redox potential and dissolved oxygen). The maximum depth of precipitaton in water is 80m. The minimum drilling diameter is 40mm.




    • Motor geophysical machine of the Mercedes type, 410_D (No. Circ. ME 105 375). It can perform seismic - electric - electromagnetic geophysical measurements and borehole loggings at depths of up to 500 meters. It is equipped with special cameras (pan & tilt) monitoring wells and pipelines of the house IBAK (Argus & Rax 11.7). There is the possibility of moving the camera within the pipeline to a length of up to 450 meters. The inside diameter of the pipeline or drilling is 100mm.

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The geophysicist equipment of our consultancy has been registered in the relevant public services, in accordance with the existing legislation. The registration form of our equipment can be shipped, upon written and substantiated request submitted by the interested party. Also, the full technical specifications of our geophysical instruments (manuals) can be sent upon request.

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