1. Institute for Geology, Mineralogy and Geophysics Ruhr‐University Bochum Bochum Germany
2. School of Earth and Environmental Sciences University of Portsmouth Portsmouth UK
3. Institute of Applied Geosciences Graz University of Technology Graz Austria
4. CNRS UMR 5563, Géosciences Environnement Toulouse (GET) Toulouse France
5. CNRS Institut de physique du globe de Paris, Université de Paris Paris France