GEONICS EM-34

Electromagnetic Meter

 The Geonics EM-34 can be used to map geologic features or groundwater contaminant plumes by measuring terrain conductivity without electrodes or ground contact using a patented electromagnetic inductive technique.  The instrument reads directly in millisiemens per meter.   Using this inductive method, surveys are readily carried out in all regions including those with high surface resistivity such as sand, gravel and asphalt.  The EM-34 requires two or three persons for operation dependent on the locationing system used.  The effective depth-of-exploration is directly dependent on the coil separation and the mode operated.  Dependent on equipment setup, the EM-34 can investigate to depths up to 200’ below ground level.  It has been designed to cover the range-of-depths most useful to engineering geophysics.  Typical applications for the EM-34 instrument are:       

¨       Delineating regions of permafrost (frozen pore water)

¨     Locating suspected and delineating known gravel deposits 

¨       Mapping saline intrusions and bedrock topography 

¨       Detecting cavities in carbonate rocks  

¨       Mapping pollution plumes in groundwater 

¨       Mapping terrain conductivity for electrical grounding    

¨       General geologic mapping of soil types, faults, and fracture zones

¨     Archaeological exploration

       Advantages of the EM-34 over conventional resistivity methods are the speed with which surveys can be conducted, the precision with which small changes in conductivity can be measured. These features make it ideal for most any type of geotechnical or groundwater contaminant survey.

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