Tsunami alert triggered in New Caledonia

A powerful 7.5-magnitude earthquake struck near New Caledonia on Wednesday, triggering a tsunami alert and emergency evacuations across a swathe of the South Pacific, but there were no immediate reports of serious damage or injuries.

Authorities said the quake, followed by at least 10 strong aftershocks, was centred about 170km southeast of New Caledonia’s Loyalty Islands at a depth of just 10km.

Tsunami waves were recorded moving out from the epicentre, prompting residents to flee to high ground and triggering surges as high as 72cm – on the island of Tanna, Vanuatu.

Island residents said the initial quake shook the walls of buildings and in places turned the sea foamy.

The Pacific Tsunami Warning Center initially warned waves of up to three metres could be expected and shallow quakes of that magnitude can be devastating.

But the centre later reported waves measured by its monitors around the region only reached about 72cm.

Civil defence officials in Noumea said tsunami waves hit parts of the Loyalty Islands and the Isle of Pines, but caused no damage.

“Reports from the area confirm that the strength of the tsunami has fallen significantly and there is no longer a major risk for the population,” said a spokesman for the civil defence department.

Almost three hours after the quake, the Hawaii-based Pacific Tsunami Warning Center reported the threat stemming from the initial quake “has now passed”.

The quake triggered emergency warning systems in New Caledonia, where residents received an urgent text message directing them to go to refuges immediately.

Basile Citre, a municipal official on the Loyalty Island of Mare, said he had been in a meeting at the town hall when he felt a small tremor followed by a bigger shock.

“When the sirens sounded, the population headed for higher ground for safety. For now, nothing serious has happened,” he said.

A spokesman for the Vanuatu geohazards observatory said the sparsely populated island of Tanna was expected to be most affected but no evacuations had been ordered.

“There are no sirens on Tanna but the people on the island are familiar with these situations and they will have taken precautions and gone to higher ground,” he said.

As multiple aftershocks of up to 6.6 magnitude were felt, CCTV footage showed bathers still frolicking in crystalline seas off Noumea, seemingly unaware of the seriousness of the threat on the other coast, just 50km away.