Last week, a volcanic eruption resulted in a tsunami and devastated Tonga. The United Nations says more than 80% of Tonga's population has been badly affected. We've seen an increase in these seismic activities and natural disasters in recent years. Is this powerful eruption a sign of more to come? CGTN's Global Watch is joined by Xiao Long. He's a professor from the School of Earth Science at the China University of Geosciences, Wuhan. Professor Xiao said that by comparing with previous records on the Pacific Ring of Fire, it cannot rule out the possibility of large eruption in the future.