1. RWTH Aachen UniversityE.ON Energy Research CenterDepartment of Applied Geophysics and Geothermal Energy Lochnerstrasse 4‐20 52056 Aachen Germany
2. Braunschweig Technical UniversityInstitute of Geophysics and Extraterrestrial Physics Mendelssohnstrasse 3 38106 Braunschweig Germany