The powerful volcanic eruption in Tonga this month, which triggered a tsunami, was about a thousand times more powerful than the atomic bomb dropped by the US on Hiroshima during the Second World War, according to Nasa.
“This is a preliminary estimate, but we think the amount of energy released by the eruption was equivalent to somewhere between 4 to 18 megatons of TNT,” Nasa scientist Jim Garvin said in a new blog post.
