1. 1Swiss Seismological Service (SED), ETH Zurich, Zürich, Switzerland
2. 2GFZ German Research Centre for Geosciences, Potsdam, Germany
3. 3NORSAR, Kjeller, Norway
4. 4University of Potsdam, Institute of Geosciences, Potsdam, Germany
5. 5Reykjavík Energy (OR), Reykjavík, Iceland