1. Swiss Federal Institute of Technology Zürich, Stefano-Franscini-Platz 5, 8093 Zürich, Switzerland
2. Department
of Civil and Environmental Engineering, Department of Mechanical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3109, United States
3. Laboratory
for Waste Management, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
4. Solid
Earth Geophysics Group, Los Alamos National Laboratory, MS D446, Los Alamos, New Mexico 87545, United States
5. Department
of Physics, University of Nevada, Reno, Nevada 89557, United States
6. Laboratory
of Building Science and Technology, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland