Prof Shane Cronin, a volcanologist at the University of Auckland, said the eruption was one of the biggest in Tonga in the past 30 years.
"This is a pretty big event - it's one of the more significant eruptions of the last decade at least," he told the BBC.
https://www.bbc.com/news/world-asia-60007119
Professor Shane Jason Cronin
https://unidirectory.auckland.ac.nz/profile/s-cronin
