The latest quake in Vanuatu, a country of around 250,000 people, resulted in no casualties or major damage, authorities said.
SBS reports the United States Geological Survey, which records seismic activity worldwide, located the hypocentre 15 kilometres deep at sea and 126 kilometres west of Port-Vila, the capital.
Vanuatu is located near the so-called Pacific Ring of Fire and the submarine volcanoes in the Lau Basin, which is why it often registers shakes of seismic origin.