LOL earthquake, seriously ???
Hunter island is closer to Vanuatu than to us. (they even tried to pinch it from us once but shot through when we sent the navy

)
Never had an earthquake do any damage in new cal.
No hire gear in Vanuatu, great destination but you've seen it all in a week end. Don't get me wrong I like the place, cheap, relaxed, nice people, but not much to do or see (great scuba diving though).
Fly to nouméa direct from Sydney, grab a hotel room around Anse Vata beach and rent your freeride gear (futura/ryde) from Aloha windsurfing.
+ if you bring me a jar of Vegemite I'll sail with you !!