1. Paleomagnetic laboratory Fort Hoofddijk Faculty of Geosciences Utrecht University Utrecht The Netherlands
2. Department of Geoscience and Petroleum Norwegian University of Science and Technology Trondheim Norway
3. Department of Earth and Planetary Sciences Harvard University Cambridge MA USA
4. Department of Earth Sciences University of Cambridge Cambridge UK
5. Mathematical Institute Faculty of Sciences Utrecht University Utrecht The Netherlands
6. Department of Computational Imaging Centrum Wiskunde & Informatica (CWI) Amsterdam The Netherlands
7. Department of Geoscience and Engineering Faculty of Civil Engineering and Geosciences Delft University of Technology Delft The Netherlands