Immense crater hole created in Tonga volcano

Immense crater hole created in Tonga volcanoImmense crater hole created in Tonga volcano External link

Researchers have just finished mapping the mouth of the underwater Tongan volcano that, on 15 January, produced Earth's biggest atmospheric explosion in over a century. The caldera of Hunga-Tonga Hunga-Ha'apai is now 4km (2.5 miles) wide and drops to a base 850m below sea level.

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