Christchurch's tsunami warning system will be tested again next weekend.
The alarms will sound for three minutes on Sunday 30 September at 11am.
Christchurch City Council's civil defence and emergency management manager Murray Sinclair said the testing is part of the Council's twice yearly testing of the sirens on the Sundays Daylight Saving begins and ends.
The system was first tested on July 22 this year, and caused concerns among some seaside residents who weren't able to hear the sirens.
"It is important to remember the sirens will only be heard within a few blocks of the beach, the coastal evacuation area from Waimairi Beach to Sumner. The system is not designed to be heard inland from these areas," Sinclair said.
He said when the system was first tested two months ago, 78 per cent of those living within the tsunami evacuation zone heard the sirens.
"This was above the international standard of 75 per cent and a great result considering the weather conditions at the time - a south-westerly was blowing and temperatures were low meaning most residents were indoors."
He says the testing is critical to ensure the system is working efficiently.
"If during the testing the sirens are reactivated for more than 10 minutes, it will no longer be a test: a tsunami will be heading for our shores and residents will need to evacuate the area."
Sinclair said Sunday 30 September would be a good time for families to develop an evacuation plan and consider the closest evacuation routes to their home.
Residents living within the evacuation zone are encouraged to fill out the online survey at www.ccc.govt.nz/tsunami after the testing to let the Council know whether they heard it.
- © Fairfax NZ News
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