Two New Zealand navy vessels will arrive in Tonga on Friday carrying critical water supplies for the Pacific island nation reeling from a volcanic eruption and tsunami.
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Hundreds of homes in Tonga's smaller outer islands have been destroyed, with at least three dead, after Saturday's huge eruption triggered tsunami waves that rolled over the islands, home to 105,000 people.
With Tonga's airport smothered by volcanic ash and communications badly hampered by the severing of an undersea cable, information on the scale of devastation has come mostly from reconnaissance aircraft.
The Red Cross said its teams in Tonga had confirmed that salt water from the tsunami and volcanic ash were polluting the drinking water of tens of thousands of people.
"Securing access to safe drinking water is a critical immediate priority ... as there is a mounting risk of diseases such as cholera and diarrhoea," said Katie Greenwood of the International Federation of Red Cross and Red Crescent Societies.
New Zealand said Tonga, one of the few countries to be free of the new coronavirus, had agreed to receive two of its ships, the Aotearoa and the Wellington, despite concerns about importing a COVID-19 outbreak that would exacerbate its crisis.
Simon Griffiths, captain of the Aotearoa, said his ship was carrying 250,000 litres of water, along with other supplies, and had the capacity to produce another 70,000 litres a day.
The Hunga Tonga-Hunga Ha'apai volcano erupted about 65km from the Tongan capital with a blast heard 2300km away in New Zealand, and sent tsunamis across the Pacific Ocean.
James Garvin, chief scientist at NASA's Goddard Space Flight Centre, said the force of the eruption was estimated to be the equivalent of five to 10 megatons of TNT, or more than 500 times that of the nuclear bomb the United States dropped on the Japanese city of Hiroshima at the end of World War II.
Waves reaching up to 15 metres hit the outer Ha'apia island group, destroying all the houses on the island of Mango, as well as the west coast of Tonga's main island, Tongatapu, where 56 houses were destroyed or seriously damaged, the prime minister's office said.
On Wednesday evening telecom operator Digicell said international telephone connectivity had been restored in the islands.
Tonga has also been largely offline since the volcano damaged its sole undersea fibre-optic communication cable. Its owner said it would probably take a month or more to fix.
The archipelago has 176 islands, 36 of them inhabited. Its main airport, Fua'amotu International, was not damaged by the tsunami but was covered in ash, which has had to be cleared by hand.
A Tongan official said it might be possible for aid flights from New Zealand and Australia to begin on Thursday.
Australian Prime Minister Scott Morrison spoke with Tongan Prime Minister Siaosi Sovaleni.
He said two Hercules aircraft were ready to go with humanitarian supplies and telecommunications equipment, and that a naval ship, the Adelaide, was preparing to depart from Brisbane with water purification equipment and additional humanitarian supplies.
As well as emergency supplies, Australia and New Zealand have promised immediate financial assistance.
The US Agency for International Development approved $US100,000 in immediate assistance, and Japan said it would give more than $US1 million in aid as well as drinking water and equipment to clear ash.
The Asian Development Bank was discussing with Tonga whether it would declare a state of emergency to draw on a $US10-million disaster facility.
China said it would send help including water and food when the airport opened.
Australian Associated Press
