In the "DOSIS" project, the simulation of elastic waves using finite differences and the associated full waveform inversion as well as Fresnel volume migration will be expanded so that anisotropy (directional dependence of physical parameters such as the propagation speed of seismic waves) and inelastic attenuation can be taken into account for a detailed characterisation of the complex geology in the area of the "Asse". The optimised combination of methods should make it possible to create reconstructed multi-parameter models (P- and S-wave propagation velocity, density, quality factors for describing inelastic attenuation and anisotropy parameters) with high resolution and to test them as efficiently as possible in order to obtain a detailed and true-to-location structural image of the subsurface.

It is expected that the improved spatial resolution of the physical parameters and a well-focused structural image compared to classic depth imaging methods will provide new insights and statements about the geological structure beneath the "Asse", in particular about the outer shape of the salt structure and the flank areas of the salt flats, but possibly also about the presumably very heterogeneous areas inside the salt flats. Furthermore, multi-parameter mapping ideally allows improved rock characterisation with regard to the stress state (anisotropy) and indications of possible fluid paths (Poisson's ratio, attenuation) as well as the determination of the elastic moduli of the subsurface based on seismic measurements at the earth's surface.

In the future, the results may play an important role in answering various geoscientific questions, e.g. evaluating and analysing the stress state or the occurrence of microseismicity, and provide additional information for a common interpretation. Furthermore, together with other geoscientific and geotechnical investigations, they form an important basis for planning the retrieval of radioactive waste from the "Asse" nuclear repository by determining the position of interfaces more precisely and characterising heterogeneities. The methods and procedures developed in the project and the experience gained through tests can be used in future for the surface exploration of other sites of the host rocks salt in shallow storage, salt in steep storage and clay rock.