Tonga Volcanic Eruption Equivalent To Hundreds Of Hiroshimas, Says NASA

NASA said the eruption "obliterated" the volcanic island north of the Tongan capital Nuku'alofa, blanketing it in a layer of toxic ash, poisoning drinking water, destroying crops and completely wiping out at least two villages.

The Tonga volcanic eruption unleashed explosive forces that dwarfed the power of the Hiroshima atomic bomb, NASA scientists have said, as survivors on Monday described how the devastating Pacific blast "messed up our brains".

The NASA Earth Observatory said the Hunga Tonga-Hunga Ha'apai volcano spewed debris as high as 40 kilometres (25 miles) into the atmosphere during the January 15 eruption that triggered huge tsunami waves.

"We think the amount of energy released by the eruption was equivalent to somewhere between five to 30 megatons (five to 30 million tonnes) of TNT," NASA scientist Jim Garvin said in a press release.

NASA said the eruption was hundreds of times stronger than the US atomic bomb dropped on the Japanese city of Hiroshima in August 1945, which was estimated to be about 15 kilotons (15,000 tonnes) of TNT.