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Application

Seismic events

We’ve used our expertise in underwater instrumentation to develop solutions for the protection of our environments. Our proven capability in sensor integration and communication in deepwater provided you with a scalable solution to the detection of tsunami waves.

What our tech can do for you

3 cm

We can detect waves as small as 3 cm in height

Safeguard

Protect coastal communities with an early warning of tsunami activity

Trusted

Based on offshore technology operationally deployed around the world

4

Up to four years continous monitoring between service intervals

Early warning system

A tsunami wave in deep water creates a small but measurable change in pressure that will be maintained for as long as 20 minutes. By monitoring these changes, information can be provided early enough to be used as part of a warning system for coastal communities that are vulnerable to tsunamis.

Long-term reliability of these systems is essential. The system might not generate a tsunami alert for months or even years, but - when one is triggered - the shore tsunami warning centre needs to receive it within a useful time frame and to know that the information is reliable.

Tsunami detection system

Our Tsunami Detection System is a customised version of our highly successful acoustic Compatt 6 transponder, and has our Wideband®2 digital acoustic technology to provide robust data transmissions, even in difficult acoustic conditions.

Operating in the LMF (14 – 20 kHz) band, the system is supplied with a buoy-mounted transceiver, but can also support telemetry with any of Sonardyne’s compatible surface dunkers or transceivers. This two-way link also enables the unit to be remotely configured.

The instrument is optimised for low-power consumption and long battery life for long term deployments, and can also be supplied as a glass-sphere (Fetch). This can be deployed for up to 10 years without needing to recover the instrument and in water depths down to 7,000 metres.

Bottom pressure recorder

At the heart of the instrument is a Bottom Pressure Recorder (BPR). The BPR continuously monitors water pressure, saving data every 15 seconds and in routine operation acoustically transmits this data hourly to a buoy on the surface. Alongside this, the instrument runs the same NOAA algorithm as used in the Deep-ocean Assessment and Reporting of Tsunamis (DART) system, which compares the measured pressure with the predicted tidally modified pressure based on the previous three hours history to correct for local conditions. If two consecutive differences between both measurements exceed three centimetres, the instrument goes into an alert mode and transmits a sequence of messages containing high resolution pressure data to the surface over the next few hours.

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