While the extent of the damage remains unclear, photos showed debris strewn across highways and cracks opening up in roads.
There have been no reports of deaths and no official confirmation of the damage caused, but residents took to social media to post pictures of cracked roads, damaged cars and items falling off supermarket shelves, Reuters reported.
The US National Tsunami Warning Center said there was no threat of tsunami waves. Earlier in the day it had said hazardous tsunami waves were possible within 1,000 kilometers (roughly 621 miles) along the coasts of Papua New Guinea and Indonesia.
The “ring” stretches along a 25,000-mile (40,000-kilometer) arc from the boundary of the Pacific Plate, to smaller plates such as the Philippine Sea plate, to the Cocos and Nazca Plates that line the edge of the Pacific Ocean.
It is home to the world’s most active volcanoes.
People most at risk from volcanic eruptions and earthquakes live in countries that lie along the Ring of Fire, including Chile, Japan, the US west coast, and other island nations including the Solomon Islands to the western seaboard of North and South Americas.
CORRECTION: An earlier version of this story quoted the Australian Red Cross as saying at least 16 people had been killed. The Red Cross has confirmed that death toll is incorrect, and related to a statement concerning a previous earthquake in Papua New Guinea that was mistakenly circulated.