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Vetem - A Very Early Time Electromagnetic System - Year 2Normal access

Authors: Louise Pellerin, M. Cathy Pfeifer and Victor F. Labson
Event name: 9th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems
Session: Innovations In Electrical And Electromagnetic Methods
Publication date: 28 April 1996
Organisations: EEGS
Language: English
Info: Extended abstract, PDF ( 3.36Mb )

Summary:
In electrically conductive conditions common in environmental characterization studies the
minimum depth of investigation for traditional electromagnetic (EM) sounding techniques is
roughly 5 meters, while ground penetrating radar (GPR) systems often investigate no more than
the top meter or so when clay minerals are present in the soil. Hence, in many cases, there is a gap
in our detection capability between the lower limit of GPR and the upper limit of traditional
electromagnetics (EM). Bridging this gap is essential to the characterization of buried waste,
contaminant plumes, and other environmental and hydrogeological targets located in the shallow
subsurface. The Very Early Time Electromagnetic (VETEM) system is designed to ascertain the
conductivity and dielectric properties of the shallow subsurface in conductive terrain (Pellet-in et al.;
1994, 1995). Hence, the one-dimensional (1-D) and three-dimensional (3-D) numerical modeling
algorithms, developed in the first year of the project, contain the full solution to the EM problem
including both displacement and conduction currents.

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