1. Swiss Seismological Service; ETH-Zurich; Zurich Switzerland
2. German Research Centre for Geosciences (GFZ); Potsdam Germany
3. National institute of Oceanography and Experimental Geophysics (OGS); Trieste Italy
4. Italian National Research Council (CNR-IMAA); Tito Italy
5. Royal Netherlands Meteorological Institute (KNMI); De Bilt Netherlands
6. Spanish National Research Council (CSIC); Madrid Spain