A 6.5-magnitude earthquake struck off Papua New Guinea on Monday, officials said, but no Pacific-wide tsunami warning was issued.The tremor hit at a depth of 28 kilometres (17 miles) near sparsely populated New Britain island, 450 kilometres northeast of the capital Port Moresby, the United States Geological Survey said.The Hawaii-based Pacific Tsunami Warning Center ruled out a widespread tsunami.“Based on all available data, a destructive Pacific-wide tsunami is not expected,” it said.New Britain, the largest island of the Bismarck Archipelago, is east of mainland New Guinea and has a population of around 500,000 people.It lies on the 4,000-kilometre Pacific-Australia plate, which forms part of the “Ring of Fire”, a hotspot for seismic activity due to friction between tectonic plates.Source: Inquirer