ITALY - A powerful series of earthquakes at Campi Flegrei, a massive supervolcano in Italy has raised fresh concerns among scientists about the risk of a major eruption. In May, the Phlegraean Fields near Naples was shaken by a magnitude 4.4 earthquake, the strongest in 40 years. Over the past six months, scientists have recorded more than 3,000 smaller quakes, known as tremors, a figure far above normal seismic activity for the area. Experts say eruptions are usually preceded with the increase in earthquake activity, as underground pressure builds up. Campi Flegrei poses a serious threat to over four million people living in the metropolitan area of Naples.