Alessandro Annunziato, European Commission Joint Research Centre, Ispra Vey, Italy, Daniele Alberto Galliano, European Commission Joint Research Centre, Ispra, Italy, Marinos Charalampakis, National Observatory of Athens, Institute of Geodynamics, Athens, Greece, Marzia Santini, Italian Department of Civil Protection, Rome, Italy and Areti Plessa, National Observatory of Athens, Athens, Greece