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Three Step Depth Focussed Inversion as a Tool to Resolve Small Resistivity Contrasts by ERTNormal access

Authors: U. Noell, T. Günther and M. Furche
Event name: 22nd EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems
Session: Best of Near Surface 2008 (NSGD Meeting), Kraków, Poland
Publication date: 29 March 2009
Organisations: EEGS
Language: English
Info: Extended abstract, PDF ( 200.55Kb )

Summary:
In more recent times Electrical Resistivity Tomography (ERT) has become a valuable tool for many
environmental research themes. Within these topics the resistivity contrasts of the different layers and
zones are of importance, i.e. sand, clay, water salinity and preferential infiltration pathways are quite
small. Inclusions with such small resistivity contrasts to the surrounding are difficult to resolve by ERT
inversion and typically the following problems occur: 1.) the true resistivity contrasts are underestimated
2.) the size of the anomalous zone is overestimated 4.) fake anomalies arise beside and between the true
anomalous zones. 4.) surface heterogeneities infer fake anomalies into the subsurface.

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