Immense crater hole created in Tonga volcano

January's huge eruption at Hunga-Tonga Hunga-Ha'apai dramatically deepened its opening, or caldera.

Prof Cronin has spent the past two and a half months in the Pacific kingdom, seconded to its geological services department.

There is evidence of continued infall of loose material - but on the whole, the volcano cone as it stands today looks structurally sound. The wealth of observational data from 15 January suggests the event became supercharged in the half-hour after 17:00 local time.

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