Earthquake which hit the area of the Phlegraean Fields (Campi Flegrei) is the second strongest ever recorded in that region - only the one on March 13, when a magnitude of 4,6 degrees was measured, was stronger.
Unlike previous earthquakes, this one happened during the day, while schools and offices were in full operation.
Anxiety reigned on the streets, parents came to pick up their children, and many students were evacuated from school buildings, writes Corriere della Sera, Nova reports.
Just a few minutes before the main shock, there were two smaller earthquakes, the magnitude of which was 2,1 magnitude.
Given the strength of this earthquake, the tremor was felt throughout the Phlegrean Fields area and in many parts of Naples.
Less than 15 minutes after the strongest earthquake, another earthquake of magnitude 3,5 was recorded.
Response to earthquakes in Phlegraean fields
Italy's Institute of Geophysics and Volcanology (INGV) has announced that the region is in the middle of a seismic swarm - a series of consecutive earthquakes.
The prefect of Naples, Michele di Bari, urgently ordered the meeting of the Coordination Center for Emergency Situations, in order to assess the situation and coordinate the response of the competent services.
The Minister of Civil Protection, Nello Musumeci, organized an emergency meeting in Rome with the heads of Civil Protection and Casa Italia, in order to assess the technical data and the situation on the ground in the affected area.
The Flergeian fields are a vast area of supervolcanic calderas, located to the west of Naples.
This region was declared a regional park in 2003 and includes as many as 24 craters and volcanic structures, most of which lie below the surface of the sea.