A surfer catches a wave in Manhattan Beach, California, on January 15, 2022. The US National Weather Service issued tsunami advisories for the entire west coast of the United States following a massive volcanic eruption across the Pacific Ocean in Tonga. [Source: Patrick T. Fallon/AFP]

The US and Japan have advised people on their Pacific coastlines to get away from the shore.

This is a precaution against tsunami waves caused by a volcano eruption in the South Pacific.

Japan has warned of waves as high as three metres, and waves of 1.2 metres hit the south of the country.

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.

Many parts of Tonga, whose capital is just 65km south of the eruption, are covered in ash and are experiencing a near-total blackout of power, phone lines and internet services. The extent of any injuries or damage is still unclear.

Social media footage showed water washing through a church and several homes, and witnesses said ash was falling over the capital, Nuku’alofa.

Videos on social media showed traffic jams as people tried to flee low-lying areas by car.

The plumes of gas, smoke and ash pouring from the volcano reached 20km into the sky, Tonga Geological Services said.

In Japan, the 1.2m tsunami was recorded in the Kominato district of Amami-Oshima Island in Kagoshima Prefecture at 23:55 (14:55 GMT) on Saturday.