A powerful 7.3 magnitude earthquake struck off Vanuatu in the Pacific Ocean on Wednesday, but no tsunami threat was detected, seismologists said.
The quake hit at a depth of 131 kilometres (81 miles) about 335 kilometres from the capital Port Vila, the United States Geological Survey said.
"Based on all available data a destructive Pacific-wide tsunami is not expected," the Pacific Tsunami Warning Centre said.
Government agency Geoscience Australia said the general threshold for an undersea earthquake that could potentially generate a tsunami was a magnitude of 6.5 and a depth of 100 kilometres.
Vanuatu is part of the "Ring of Fire", a zone of tectonic activity around the Pacific that is subject to frequent earthquakes and volcanic eruptions.
The South Pacific island was jolted by a 6.8-magnitude tremor in late January and another of 6.5 in February, but there were no reports of damage.
The quake hit at a depth of 131 kilometres (81 miles) about 335 kilometres from the capital Port Vila, the United States Geological Survey said.
"Based on all available data a destructive Pacific-wide tsunami is not expected," the Pacific Tsunami Warning Centre said.
Government agency Geoscience Australia said the general threshold for an undersea earthquake that could potentially generate a tsunami was a magnitude of 6.5 and a depth of 100 kilometres.
Vanuatu is part of the "Ring of Fire", a zone of tectonic activity around the Pacific that is subject to frequent earthquakes and volcanic eruptions.
The South Pacific island was jolted by a 6.8-magnitude tremor in late January and another of 6.5 in February, but there were no reports of damage.
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