Vanuatu continues to be jolted by several moderate to strong earthquakes after a magnitude 7.1 quake hit last week.
Several earthquakes, including a 6.1 and a 6.0, hit on Monday. Since the larger quake struck on Friday there have been 20 quakes of magnitude 4.5 or above, according to the U.S. Geological Survey. Most have been centred near the 7.1 quake, which hit about 124km west of Port-Vila, Vanuatu's capital.
No tsunami warnings have been issued, and there have been no reports of injuries or damage.
The region lies on the "Ring of Fire" - an arc of earthquake and volcanic zones that stretches around the Pacific Rim. About 90 per cent of the world's quakes occur in the region.
