A once-in-2500 year event will be required for a tsunami to
threaten Dunedin, Dunedin City Council civil defence manager
Neil Brown says.
Research by GNS Science carried out after the 2011 Tohoku
earthquake and tsunami flattened parts of Japan showed
Dunedin was not ''tsunamigenic'', Mr Brown told those at a
meeting of the Civil Defence emergency management group
''[Tsunamis are a] relatively low risk and reasonably low
consequence event for Dunedin compared to a lot of other
parts of New Zealand,'' he said.
The main areas of concern were near river and harbour mouths
and estuaries, but those areas were not densely populated in
Dunedin, he said.
The ''prime risk'' for the city was a tsunami generated by a
South American earthquake, but such an event would give
authorities hours to evacuate areas that could be affected,
''We could go and knock on all the doors of the houses around
there before that hits,'' he said.
The research showed Niwa's earlier modelling gave an accurate
picture of tsunami risk in the area.