4.7-magnitude earthquake strikes Italy, injures four (Reuters image)A 4.7-magnitude earthquake struck the volcanic Campi Flegrei (Phlegraean Fields) area near the southern Italian city of Naples on Friday, injuring four people, damaging buildings and churches. It also triggered power outages that disrupted train and metro services.The earthquake struck at 7.46 pm (local time), with its epicentre in the Campi Flegrei volcanic area west of Naples at a depth of about 3 km (2 miles), according to Italy's National Institute of Geophysics and Volcanology.The Italian fire service said minor damage was reported to buildings in and around Naples, but added that emergency crews had not received any immediate requests for rescue or assistance, as cited by Reuters.As a precaution, local authorities suspended rail and metro services while inspections were carried out.Italian media described the tremor as one of the strongest ever recorded in the Campi Flegrei area, prompting residents in several neighbourhoods to rush onto the streets as the ground shook.Campi Flegrei, a densely populated volcanic caldera that spans much of western Naples, has witnessed increasingly frequent seismic activity in recent years, prompting Italian authorities to intensify monitoring of the area.While low-intensity tremors are common in the region, stronger earthquakes have revived concerns over a repeat of the seismic crisis of the early 1980s, which caused widespread disruption and forced thousands of residents to evacuate their homes.Italy is prone to earthquakes due to its geological setting. In 2016, a series of powerful quakes struck central Italy, devastating parts of the Lazio, Umbria and Marche regions and killing around 300 people.The country's deadliest earthquake in recent decades was the 6.9-magnitude Irpinia quake in southern Italy in November 1980, which claimed about 2,700 lives and devastated hundreds of towns.