An earthquake struck late Saturday off Papua New Guinea's eastern coast with a preliminary magnitude of 7.5, the U.S. Geological Survey said.
The quake struck at 11:27 p.m. (9:27 a.m. ET) and occurred at a depth of 19 miles (32 km), the USGS said.
It was centered 47 miles (75 km) southwest of Panguna, Papua New Guinea.
After the quake, the Pacific Tsunami Warning Center issued a tsunami warning for Papua New Guinea and the Solomon Islands.
Earthquakes with magnitudes between 7.0 and 7.9 are classified by USGS as "major," second only to "great," which are 8.0 and up.