Strong earthquake M6.6 hit Vanuatu on October 20, 2012 at 23:00:32 UTC. Epicenter was located 226 km (140 miles) NNW (345°) from Santo (Luganville) and 499 km (310 miles) NNW (338°) from PORT-VILA, Vanuatu (13.572°S, 166.594°E) at depth of 35.4 km (22.0 miles) according to USGS. Magnitude 6.2 was registered by EMSC at depth of 49 km (30.4 miles
The earthquake happened right at the intersection of the plate boundaries.
Expect more of these as well, the area is becoming more unstable.
Also, a strong flare was reported from the Sun a couple of hours ago, so further earthquakes are likely.