GT Pequan
An inverse problem of magnetization in geoscience
Jeudi 26 février 2015Sylvain Chevillard (Inria, équipe Apics)
When rocks are heated (typically when they are formed, or after subsequent alteration), they can become magnetized by the ambient magnetic field. This remanent magnetization is used to study important processes in Earth sciences, since it provides records of past variations of the geodynamo. It has been used, e.g., to study motion of tectonic plates and geomagnetic reversals. SQUID microscopes are sensitive instruments, able to measure the magnetic field produced by the remanent magnetization of thin slabs of rocks. More precisely, it can measure the normal component of the magnetic field on a plane slightly above the sample, with a good spatial resolution. We will present on-going research on the inverse problem consisting in recovering the magnetization distribution of the sample, from the measures given by a SQUID microscope.
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