It is important not to neglect New Zealand. In 
many scenarios the primary danger to New 
Zealand would be a tsunami coming from the 
east . The country has a very tough time when 
the tsunamis originate west (Tasman Sea) or 
even north. In many of the southern-origin 
scenarios Auckland (400,000) and 
Christchurch (375,000) escape major damage.
Regrettably, the very charming city of 
Wellington almost never fares well. Due to the 
peculiar topology of Cook Strait, on average  a 
southern tsunami is by far the most deadly for 
Wellington. Large ships caught in shallow 
water or docked would easily be in serious 
trouble. Nor would the walls of water be overly 
concerned about whether they were more likely 
to kill hundreds of thousands of Australia's 20 
million people or hundreds of thousands of 
New Zealand's 4 million. The two countries are 
tightly linked financially and socially. It would 
not matter for whom the warning buoy tolled.
How realistic is the threat?