As a geologist or archeologist, how can you identify resources without sampling or disturbing surfaces? How can you detect buried features in difficult-to-reach areas, or without excavation?

Geophysical surveys are archaeological methods that use ground-based physical sensing techniques to produce a detail image or map of an area. These methods are neither invasive nor destructive, an important goal when surveying culturally sensitive sites such as cemeteries.
Geophysical surveys are modern investigation techniques involving the systematic collection of geophysical data for spatial studies.  Geophysical surveys may use a wide variety of sensing instruments and data may be collected from above or below the Earth’s surface. Geophysical surveys have many applications (geology, hydrogeology, engineering, instability of the subsoil, seismology, archeology, etc.).

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Furthermore, this type of investigation offers many advantages, such as the opportunity to study not only areas of considerable size, but also limited ones, to a high level of detail, quickly and at low cost. Moreover, as the surveys are non-invasive, they offer minimal risk to workers in hazardous environments (for example in the investigation of polluted sites) and minimal disturbance of surface and ground, facilitating the work in urban areas, areas of natural beauty or archaeological environments.
A well-designed reconnaissance program will give you intelligence about the subsurface. The success of a geophysical survey depends on the selection of the best methods and well-planned data acquisition parameters. Geophysics utilizes remote measurements of the earth to conduct non-destructive surveys of the subsurface.
The analysis and comparison of the data acquired with direct and indirect evidence type geophysical surveys mean that a detailed modelling of the ground and its geological, environmental and seismic parameters can be made, providing all knowledge necessary for design and planning. Indeed, a land model defined in all its components makes for better design, the building of higher performance structures and, above all, savings in the realization of the works in terms of time and cost.

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Geophysical Prospection
– Gravity
– Magnetic and Gradiometric
– Magnetotelluric
– Electrical Tomography
– G.P.R
– Deep Seismic
– Shallow Seismic

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Geotechnical and Geognostic Surveys
Stratigraphic reconstruction of the subsoil allows determining the geomechanical and geophysical features of the soil. It is needed before any consolidation project and/or soil studies, providing an accurate stratigraphic reconstruction of the soil.

The goal of surveys is to:

  • identify the nature and the stratigraphy of lands and rocks constituting the underground;
  • determine the regime of underground water;
  • identify the properties of various soils in the underground:

–     physical (grain size assortment, porosity, water content, weight per unit of volume, etc.);
–     mechanical (compressibility, deformability, resistance to breakage, etc.);
–     hydraulic (permeability).

 S.Te.G.A Company – Technologies for Geology and Environment with 30 years experiences in the
field of applied geophysics and applied geology

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