1. Institute for Geophysics and extraterrestrial PhysicsTU Braunschweig Braunschweig Germany
2. Department of Geodesy and Geoinformation, Research Group GeophysicsTU Wien Vienna Austria
3. Institute of Geosciences, Geophysics SectionRheinische Friedrich‐Wilhelms‐Universität Bonn Bonn Germany
4. School of GeoSciencesUniversity of Edinburgh Edinburgh UK