Similar size and even bigger earthquakes hit off the coast of Vanuatu right through 2010, and there was a smaller one (5.6) in Jan 2011. Tsunami warnings were issued with most of the 2010 ones, but fortunately none ensued (beyond slight wave height increases). Apparently it's par for the course over there...

It's a very active place - volcanoes & all! Googling would pick up more of the history.
Cheers -
PS, can a moderator lock this thread please? I'm planning to visit there again in July-Aug.