1. Geophysics Section, Dublin Institute for Advanced Studies, Dublin Ireland
2. GFZ German Research Centre for Geosciences, Potsdam, Germany
3. Institute of Geosciences, University of Potsdam, Potsdam, Germany
4. Department of Earth Sciences, University of Pisa, Pisa, Italy
5. Iceland GeoSurvey, Reykjavìk, Iceland
6. Swiss Seismological Service, ETH-Zurich, Zurich, Switzerland