Powerful quake hits off Papua New Guinea, initial tsunami alert wound back

An 7.9-magnitude earthquake struck off Papua New Guinea (PNG) on Sunday, triggering a tsunami alert for several Pacific islands though that was subsequently wound back to cover just PNG and the neighbouring Solomon Islands.
The United States Geological Survey (USGS) downgraded the quake from an initial measurement of magnitude 8.
It struck some 47km west of Arawa on the north coast of Bougainville Island at a depth of 154km, USGS reported.
The Pacific Tsunami Warning Centre said in an updated advisory that waves of 0.3 to 1 metre above tidal level were possible along the coasts of PNG and the Solomon Islands.
It wound back an earlier alert that encompassed Nauru, Pohnpei, Kosrae, Vanuatu, Chuuk and Indonesia.
Quakes are common in Papua New Guinea, which sits on the Pacific’s “Ring of Fire”, a hot spot for seismic activity due to friction between tectonic plates.