Acknowledgements

We thank all the INGV people who continuously analyze data from the National Seismic Network.

We also thank the University of Genova, INOGS Trieste, the University of Calabria, the University of Bari, IGT of Prato, ENI-AGIP, O.B. of Perugia, Regione Marche, Servizio Sismico Nazionale (SSN), INGV-OV, INGV-CT and, which provided arrival time data.

The development and maintenance of the National Seismic Network is carried out by the National Earthquake Centre of INGV with the support of the National Department of Civil Protection.