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Towards High-Resolution Imaging Of Subsurface Pollution: An Introduction To The Magneto-Electrical Resistivity Imaging Tool (Merit)Normal access

Authors: B. Kulessa, U. Jaekel, M. Bick, U. Hashagen and H. Vereecken
Event name: 13th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems
Session: Geoelectrical - Inversion & Applications
Publication date: 20 February 2000
Organisations: EEGS
Language: English
Info: Extended abstract, PDF ( 1.24Mb )

Summary:
In order to obtain unique, high-resolution images of subsurface contaminant movement it is
particularly promising to combine data resulting from application of several geophysical
monitoring techniques. We propose the Magneto-Electrical Resistivity Imaging Tool (MERIQ as
a suitable method that aims to combine traditional electrical resistivity tomography (ERT) and
magnetometric resistivity (MMR). MERIT involves simultaneous measurement of both the
electric and the magnetic field responses to injection of a low-frequency current into the ground
using modern lock-in technology, While the feasibility of ERT imaging of subsurface pollution
has been proven beyond doubt, MMR has almost exclusively been used by the mining industry,
and suitable data inversion schemes are not readily available. In order to resolve this
shortcoming, we present an algorithm that allows reconstruction of the subsurface bulk electrical
conductivity distribution from surface magnetic field data. The solution is unique in two
dimensions. Forward and inverse modelling experiments involving conceptual and synthetic data
are described, proving the usefulness of the proposed framework for the inversion of MMR data.

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