At 18.55 UTC on January 16, 2016, an earthquake of magnitude ML 4.1 (MW 4.3) has been recorded by the National Seismic Network (in Italian: Rete Sismica Nazionale – RSN, http://doi.org/10.13127/SD/X0FXNH7QFY ) of the National Institute of Geophysics and Volcanology (in Italian: Istituto Nazionale di Geofisica e Vulcanologia - INGV). The earthquake affected the provinces of Campobasso and Isernia and also some areas of the neighboring provinces of Caserta, Benevento and Foggia. The event, located at about 6 km away from Campobasso and at depth ~ 10 km, had been preceded during the day by approximately ten events with maximum magnitude ML 2.9. The seismic sequence is located in an area of high seismic hazard and it occurred about 20 km southwest of the seismic sequence which began on...