Non-destructive problem solving—worldwide

            GPR  SEWER SURVEY—PARIS

        GEOPHYSICAL SURVEY METHODS

                          UTILISED FOR      

                 SUBSURFACE PROBLEMS

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GROUND PROBING RADAR.

A very common and adaptable survey method which can be used in many site situations (example above) for subsurface details from a few mm depth to several metres below surface.

 

ELECTRICAL  RESISTIVITY IMAGING.

Can be used for greater depths of exploration and to highlight changes in geological strata. These changes  may be natural or environmental ie. contaminants.

 

SEISMIC REFRACTION/REFLECTION.

Also used to gain deeper information or material properties where the electrical contrast may not be adequate.

Quantitative information is more accurate.

 

ELECTROMAGNETICS.

Ground conductivity is often used for mapping strata changes, contaminants and pipe /service location but not quantitatively.

 

MAGNETOMETRY.

Local variations in the earths magnetic field are produced typically by mineshafts or UXO. This can be measured and contour plotted.

 

MICROGRAVITY.

Minute changes in gravity are caused by local density variations typically voiding which is measured and contour plotted.

 

 

 

 

 

 

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