We consider the inverse problem of identifying an unknown inclusion contained in an
elastic body by the Dirichlet-to-Neumann map. The body is made by linearly elastic, homogeneous,
and isotropic material. The Lamé moduli of the inclusion are constant and different from those of
the surrounding material. Under mild a priori regularity assumptions on the unknown defect, we
establish a logarithmic stability estimate. Main tools are propagation of smallness arguments based
on three-spheres inequality for solutions to the Lamé system and a refined asymptotic analysis of the
fundamental solution of the Lamé system in presence of an inclusion which shows surprising features.
