The US warned of strong currents and waves, and coastal flooding.
The huge underwater volcanic eruption caused waves of more than a metre to crash into Tonga.
The eruption of the Hunga Tonga-Hunga Haʻapai volcano was heard across the South Pacific, and eventually as far away as the US.
A tsunami warning has been issued for parts of Australia's east coast and Tasmania, and the north and east coast areas of New Zealand's North Island.
