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Electrical Impedance Tomography in geophysics, application of EIDORS
 

Summary: Electrical Impedance Tomography in
geophysics, application of EIDORS
Lesparre N., Adler A., Gibert D., Nicollin F.
Introduction
The open-source collaborative software suite EIDORS (Adler and Lionheart, 2006), has been
written primarily with a focus on medical imaging. This paper describes our work to adapt
EIDORS for applications in geophysics. In geophysics, we apply EIT in order to image inner
structures of geological objects since the rock resistivity can vary by several orders of
magnitude depending on the rock nature, porosity and water content. The geometry of the
electrode array consists most often in profiles of regularly spaced electrodes. And the
geometrical factor is usually calculated to represent quickly the apparent conductivities, this
allows to control the data quality in the aftermath of their acquisition. The distance between
the electrodes defines the spatial resolution and the penetration depth. The spatial resolution
of the method in geophysics is of the order of meters and the penetration depth can reach
500m.
We adapted the software EIDORS to inverse two sets of geophysical data. The first data set
correspond to a study of the impact of excavations on clay properties in the Mont Terri
underground rock laboratory. The second data set has been acquired on la Soufrière de
Guadeloupe volcano to constrain the geometry of the hydrothermal system. EIDORS allows
us to take into account the geometry of the electrode arrays and to make joint inversion of

  

Source: Adler, Andy - Department of Systems and Computer Engineering, Carleton University

 

Collections: Computer Technologies and Information Sciences