Tsunami evacuation zones updated
From local democracy reporter Jonathan Leask:
Minor changes in revised tsunami evacuation zones mainly impact 10 rural properties.
The Ashburton District Council released its updated tsunami evacuation zones after scientific modelling showed new areas that could be flooded in some worst-case tsunami scenarios.
Council strategy and compliance group manager, Jane Donaldson, said most of the newly included area is rural land rather than homes, but people who live or spend time near the coast are encouraged to familiarise themselves with the updated zones.
“These events are rare, so people don’t need to be alarmed, however they should have a plan for what to do if they need to evacuate.”
Based on the new modelling, that was commissioned by Environment Canterbury, the changes in the Ashburton District are relatively minor, with around 10 new properties included in the revised zones.
Settlements such as the South Rakaia Huts, Lower Hakatere Huts, and North Rangitata Huts were already located within existing tsunami evacuation zones.
The district has two tsunami evacuation zones, red and orange.
The red zone is most likely to be affected by a tsunami and includes estuaries, river mouths, and beaches where a tsunami of any size could cause strong currents and surges in the water.
The orange zone is less likely to be affected by a tsunami than the red zone and includes areas of land that could be flooded in a large tsunami.
Donaldson said that people in the red and orange zones need to evacuate immediately if they feel a long or strong earthquake, or receive an official tsunami warning.
“There may not be time for an official warning, so once the shaking stops, head immediately inland until you’re outside of the evacuation zones.”
Donaldson said coastal residents should search their address on the council website (ashburtondc.govt.nz/tsunami) and see if any of their property is within a tsunami evacuation zone.
ECan senior scientist - natural hazards, Helen Jack, said the likelihood of a tsunami being created close to Ashburton’s coast is small, and the biggest tsunami threats for the district are those created by large earthquakes on the Hikurangi or Kermadec subduction zones (to the east and north of the North Island), the Puysegur subduction zone (to the south of Fiordland), or by large earthquakes off the coasts of Central or South America.
A map of the new evacuation zones and further information can be found at: Ashburtondc.govt.nz/tsunami
*Public Interest Journalism funded through NZ On Air
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