SYDNEY - A 7.5-magnitude earthquake struck off the coast of Papua New Guinea on Monday, US seismologists said, with “hazardous” tsunami waves possible in areas near the epicentre although no major damage was immediately reported.
The quake hit at a depth of 33 kilometres (20 miles), some 55 kilometres from the nearest city of Kokopo on New Britain island and 787 kilometres from the capital Port Moresby, the United States Geological Survey said. “Based on all available data hazardous tsunami waves are forecast for some coasts,” the Pacific Tsunami Warning Centre said as a result of the quake, which was estimated earlier at 7.7 magnitude before being revised. The tsunami risk was expected to be limited to PNG, with waves of between one and three meters possible. Much smaller waves of less than 30 centimetres above the tide level could affect the coasts of other areas of the Pacific, including Australia, Japan, Philippines, New Caledonia, Marshall Islands, Fiji, Samoa, and Vanuatu, it said. The initial quake was followed by a smaller 5.7-magnitude aftershock in the same area.
Geoscience Australia seismologist Jonathan Bathgate said that there was a possibility of a local tsunami but based on the magnitude of the quake it was likely to be on the lower end of the scale. “It would have been quite widely felt, certainly within 100 kilometres,” he told AFP of the quake. “It’s probably not going to be damaging. Although people would have felt strong shaking there’s probably not going to be a lot of widely spread damage.” The nearest town of Kokopo, the capital of East New Britain, has a population of around 20,000. It started to grow after nearby Rabaul was flattened by volcanic eruptions in 1994.