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Underwater volcanoes: how ocean colour changes can signal an imminent eruption

By Matthew Blackett, Reader in Physical Geography and Natural Hazards, Coventry University

The scale of a recent volcano eruption took the people of Tonga by surprise. Scientists monitoring the submarine volcano, Hunga Tonga-Hunga Ha'apai, were likewise caught off-guard, failing to foresee an explosion which would unleash a Pacific-wide tsunami.

The scale of the eruption was hailed as a “once in a millenium” event by one scientist.…

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