1. ISTERRE University Grenoble Alpes University Savoie Mont Blanc CNRS IRD UGE Grenoble France
2. The Njord Centre Department of Geosciences University of Oslo Oslo Norway
3. National Land Survey of Iceland Akranes Iceland
4. Institute of Earth Sciences University of Iceland Reykjavík Iceland
5. LEGOS CNRS University of Toulouse Toulouse France
6. Icelandic Meteorological Office Reykjavík Iceland