Tonga volcano eruption said to be more powerful than atomic bomb
The volcanic eruption in Tonga that triggered a tsunami was hundreds of times more powerful than the atomic bomb the US dropped on Hiroshima during World War Two, Nasa says.
The eruption obliterated an island north of the Tongan capital Nuku'alofa, the agency said. Tonga says more than four-fifths of the population has been affected by the tsunami and falling ash.