Christchurch tsunami sirens face axe after failed test, communication breakdowns

Christchurch may reduce tsunami sirens to four due to their unreliability and confusion. A review recommends prioritizing emergency mobile alerts, aligning with national best practices. Sirens are prone to failure, misinterpretation, and create delays. Mobile alerts provide clear evacuation instructions. The city aims for a straightforward, effective system to prevent loss of life during a tsunami.