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One year ago today Hunga Tonga Hunga Ha'apai erupted, causing a devasting tsunami to reach the island. To help us better predict wave forms created by volcanic eruptions in future, a group of researchers have been mapping seafloor. New Zealand-based marine geologist Dr Marta Ribó tells Max what they've found.
This map shows the sites of ongoing venting after the eruption Photo: Marta Ribo/AUT, CC BY-ND