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Tonga blast ‘on par with hundreds of Hiroshimas’

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The eruption blanketed the island kingdom of about 100,000 in a layer of toxic ash. HANDOUT NASA/NOAA/AFP

Tonga blast ‘on par with hundreds of Hiroshimas’

The Tonga volcanic eruption unleashed explosive forces that dwarfed the power of the Hiroshima atomic bomb, Nasa scientists have said, as survivors on January 24 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 40km 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 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 15,000 tonnes of TNT.

The agency said the eruption “obliterated” the volcanic island about 65km north of the Tongan capital Nuku’alofa.

It blanketed the island kingdom of about 100,000 in a layer of toxic ash, poisoning drinking water, destroying crops and completely wiping out at least two villages.

It also claimed at least three lives in Tonga and resulted in the drowning deaths of two beachgoers in Peru after freak waves hit the South American country.

Peruvian authorities have declared an environmental disaster after the waves hit an oil tanker offloading near Lima, creating a huge slick along the coast.

In Tonga, the scale of destruction remains unclear after communications to remote islands were knocked out.

Nuku’alofa-based journalist Mary Lyn Fonua said locals were still coming to terms with the scale of the disaster. “It’s so beyond what anyone here has ever experienced,” she told AFP.

Fonua said the coating of fine grey grime covering everything was proving difficult to live with and raising concerns about long-term health issues.

Japanese, New Zealand and Australian defence forces have started delivering urgent relief supplies, particularly water, while maintaining strict Covid-19 protocols to preserve Tonga’s virus-free status.

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