New Zealand Vibration Optical Cable

New Zealand is leveraging existing optical fibre networks for advanced seismic and vibration monitoring using technologies like FiberSense VIDAR and Distributed Acoustic Sensing.

FiberSense VIDAR Technology

FiberSense, in partnership with Vodafone New Zealand, has developed VIDAR (Vibration Detection and Ranging), a patented system that converts fibre optic cables into dense arrays of vibration sensors . This technology allows real-time monitoring of ground motion, infrastructure vibrations, and seismic events across urban areas such as Wellington. The system captures vibrations along fibre cables, enabling detection of earthquakes at street and building levels, and provides data for rapid response and infrastructure protection . VIDAR integrates optical fibre sensing, photonics, and AI to analyze vibrations over large geographical grids.

Distributed Acoustic Sensing (DAS) Experiments

In addition to VIDAR, New Zealand researchers are using Distributed Acoustic Sensing (DAS) to study seismic activity along the Alpine Fault in the South Island . DAS converts existing telecommunication fibre-optic cables into thousands of densely spaced ground-motion sensors. Pulses of light travel along the fibre, and vibrations caused by seismic waves modulate the scattered light, which is recorded at high resolution. This method allows scientists to map fault structures and detect small-scale seismic events that conventional seismometers might miss.

Undersea Optical Cable Applications

New Zealand is also exploring undersea optical fibre cables for earthquake and tsunami monitoring . The National Physical Laboratory (UK) and New Zealand's Measurement Standards Laboratory are testing optical interferometry techniques on the Southern Cross NEXT cable in the Tasman Sea. This approach uses existing submarine fibre infrastructure to detect seismic activity and ocean currents without installing new hardware, potentially creating thousands of ocean-bottom sensors for early warning systems.

Benefits and Implications

• High-resolution seismic data: Street-level and building-level monitoring improves earthquake preparedness.
• Cost-effective deployment: Utilizes existing fibre networks, avoiding the need for new sensor installations.
• Real-time monitoring: Supports rapid response to natural disasters and infrastructure events.
• Scalable applications: Can extend to urban, regional, and undersea environments for comprehensive hazard detection. New Zealand's adoption of vibration-sensitive optical cables represents a cutting-edge integration of telecommunications infrastructure with geoscience, enhancing earthquake detection, public safety, and environmental monitoring across both land and sea.