The quake briefly prompted a tsunami alert for parts of Vanuatu, according to the U.S ... U.S.G.S. scientists to update the shake-severity map. An aftershock is usually a smaller earthquake ...

Vanuatu is a group of 80 islands that is home to about 330,000 ... earthquake monitoring systems were fully operational again. Map showing Port Vila, the capital of Vanuatu. Video footage from ...